Test Procedures for Walk-in Coolers and Walk-in Freezers by yurtgc548

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									                                                                                                                                        Thursday,
                                                                                                                                        September 9, 2010




                                                                                                                                        Part III

                                                                                                                                        Department of
                                                                                                                                        Energy
                                                                                                                                        10 CFR Part 431
                                                                                                                                        Energy Conservation Program: Test
                                                                                                                                        Procedures for Walk-In Coolers and Walk-
                                                                                                                                        In Freezers; Proposed Rule
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




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                                                  55068               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  DEPARTMENT OF ENERGY                                    Technologies Program, Mailstop EE–2J,                   8. U–Factor of Doors and Windows
                                                                                                          1000 Independence Avenue, SW.,                          9. Walk-In Envelope Steady-State 

                                                  10 CFR Part 431                                         Washington, DC 20585–0121. Please                          Infiltration Test 

                                                                                                                                                                  10. Door Steady-State Infiltration Test
                                                  [Docket No. EERE–2008–BT–TP–0014]                       submit one signed original paper copy.
                                                                                                                                                                  11. Door Opening Infiltration Assumptions
                                                                                                            4. Hand Delivery/Courier: Ms. Brenda
                                                                                                                                                                  12. Infiltration Reduction Device 

                                                  RIN 1904–AB85                                           Edwards, U.S. Department of Energy,                        Effectiveness 

                                                                                                          Building Technologies Program, 950                      13. Relative Humidity Assumptions
                                                  Energy Conservation Program: Test                       L’Enfant Plaza, 6th Floor, Washington,                  C. Refrigeration System
                                                  Procedures for Walk-In Coolers and                      DC 20024. Please submit one signed                      1. Definition of Refrigeration System
                                                  Walk-In Freezers                                        original paper copy.                                    2. Version of AHRI 1250
                                                  AGENCY:  Office of Energy Efficiency and                  For detailed instructions on                          3. Annual Walk-In Energy Factor
                                                                                                          submitting comments and additional                    IV. Regulatory Review
                                                  Renewable Energy, Department of                                                                                 A. Review Under Executive Order 12866
                                                  Energy.                                                 information on the rulemaking process,
                                                                                                                                                                  B. Review Under the National 

                                                                                                          see section V of this document.
                                                  ACTION: Supplemental notice of                                                                                     Environmental Policy Act 

                                                                                                            Docket: For access to the docket to
                                                  proposed rulemaking.                                                                                            C. Review Under the Regulatory Flexibility
                                                                                                          read background documents or                               Act
                                                  SUMMARY:    The U.S. Department of                      comments received, visit the U.S.                       1. Reasons for the Proposed Rule
                                                  Energy (DOE) previously published a                     Department of Energy, Resource Room                     2. Objectives of and Legal Basis for the 

                                                  notice of proposed rulemaking to adopt                  of the Building Technologies Program,                      Proposed Rule 

                                                                                                          950 L’Enfant Plaza, 6th Floor,                          3. Description and Estimated Number of
                                                  test procedures for measuring the energy
                                                                                                          Washington, DC 20024, (202) 586–2945,                      Small Entities Regulated
                                                  consumption of walk-in coolers and                                                                              4. Description and Estimate of Compliance
                                                  walk-in freezers, pursuant to the Energy                between 9 a.m. and 4 p.m. Monday
                                                                                                                                                                     Requirements
                                                  Policy and Conservation Act (EPCA), as                  through Friday, except Federal holidays.
                                                                                                                                                                  5. Duplication, Overlap, and Conflict With
                                                  amended. DOE is continuing to consider                  Please call Ms. Brenda Edwards at the                      Other Rules and Regulations
                                                  those proposals, but is now soliciting                  above telephone number for additional                   6. Significant Alternatives to the Rule
                                                  comments on several alternative                         information regarding visiting the                      D. Review Under the Paperwork Reduction
                                                  proposed options. Once any final test                   Resource Room.                                             Act
                                                                                                          FOR FURTHER INFORMATION CONTACT: Mr.                    E. Review Under the Unfunded Mandates
                                                  procedure is effective, any
                                                                                                          Charles Llenza, U.S. Department of                         Reform Act of 1995
                                                  representation as to the energy use of                                                                          F. Review Under the Treasury and General
                                                  walk-in equipment must reflect the                      Energy, Building Technologies Program,
                                                                                                                                                                     Government Appropriations Act, 1999
                                                  results of testing that equipment using                 EE–2J, 1000 Independence Avenue,                        G. Review Under Executive Order 13132
                                                  the test procedure. Concurrently, DOE is                SW., Washington, DC 20585–0121, (202)                   H. Review Under Executive Order 12988
                                                  undertaking an energy conservation                      586–2192, Charles.Llenza@ee.doe.gov;                    I. Review Under the Treasury and General
                                                  standards rulemaking for this                           Mr. Michael Kido, U.S. Department of                       Government Appropriations Act, 2001
                                                  equipment. If DOE receives data in this                 Energy, Office of General Counsel, GC–                  J. Review Under Executive Order 13211
                                                  test procedure rulemaking that are                      71, 1000 Independence Avenue, SW.,                      K. Review Under Executive Order 12630
                                                                                                          Washington, DC 20585–0121, (202) 586–                   L. Review Under Section 32 of the Federal
                                                  pertinent to the development of
                                                                                                          8145, Michael.Kido@hq.doe.gov; or Ms.                      Energy Administration (FEA) Act of 1974
                                                  standards, it will use that data in                                                                           V. Public Participation
                                                  evaluating potential standards for this                 Elizabeth Kohl, U.S. Department of
                                                                                                                                                                  A. Submitting Public Comment
                                                  equipment. Once these standards are                     Energy, Office of General Counsel, GC–                  B. Issues on Which DOE Seeks Comment
                                                  promulgated, the adopted test                           71, 1000 Independence Avenue, SW.,                      1. Upper Limit of Walk-In Cooler
                                                  procedures will be used to determine                    Washington, DC 20585–0121, (202) 586–                   2. Basic Model of Envelope
                                                  compliance with the standards.                          7796. E-mail:                                           3. Basic Model of Refrigeration
                                                  DATES: DOE will accept comments, data,                  Elizabeth.Kohl@hq.doe.gov.                              4. Updates to Standards
                                                                                                                                                                  5. Heat Conduction Through Structural
                                                  and information regarding this                          SUPPLEMENTARY INFORMATION:
                                                                                                                                                                     Members
                                                  supplemental notice of proposed                         I. Authority and Background                             6. Alternatives to ASTM C1303–10
                                                  rulemaking (SNOPR) no later than                        II. Summary of the Proposal                             7. Improvements to ASTM C1303 

                                                  October 12, 2010. See section V of this                 III. Discussion                                            Methodology 

                                                  SNOPR for details.                                         A. Overall Issues                                    8. Conduction Through Floors
                                                                                                             1. Definition of Walk-In Cooler or Freezer:          9. ‘‘Hybrid’’ Walk-Ins
                                                  ADDRESSES: Any comments submitted                             Temperature Limit
                                                  must identify the SNOPR for Test                                                                                10. U–Factor of Doors and Windows
                                                                                                             2. Testing and Compliance Responsibility             11. Envelope Infiltration
                                                  Procedures for Walk-In Coolers and                         3. Basic Model of Envelope
                                                                                                                                                                  12. Relative Humidity Assumptions
                                                  Walk-In Freezers and provide docket                        4. Basic Model of Refrigeration Systems
                                                                                                                                                                  13. Definition of Refrigeration System
                                                  number EERE–2008–BT–TP–0014 and/                           B. Envelope
                                                                                                                                                                  14. Annual Walk-In Energy Factor
                                                  or Regulation Identifier Number (RIN)                      1. Heat Conduction Through Structural
                                                                                                                                                                  15. Impacts on Small Businesses
                                                                                                                Members
                                                  1904–AB85. Comments may be                                                                                    VI. Approval of the Office of the Secretary
                                                                                                             2. Use of ASTM C1303 or EN 13165:2009–
                                                  submitted using any of the following                          02
                                                  methods:                                                                                                      I. Authority and Background
                                                                                                             3. EN 13165:2009–02 as a Proposed 

                                                    1. Federal eRulemaking Portal: http://                      Alternative to ASTM C1303–10 
                     Title III of the Energy Policy and
                                                  www.regulations.gov. Follow the                            4. Version of ASTM C1303                           Conservation Act of 1975, as amended
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                                                  instructions for submitting comments.                      5. Improvements to ASTM C1303 
                    (‘‘EPCA’’ or, in context, ‘‘the Act’’) sets
                                                    2. E-mail: WICF–2008–TP–                                    Methodology 
                                   forth a variety of provisions designed to
                                                  0014@hq.doe.gov. Include the docket                        6. Heat Transfer Through Concrete                  improve energy efficiency. Part B of
                                                                                                             a. Floorless Coolers                               Title III (42 U.S.C. 6291–6309) provides
                                                  number EERE–2008–BT–TP–0014 and/
                                                                                                             b. Pre-Installed Freezer Floor
                                                  or RIN 1904–AB85 in the subject line of                    c. Insulated Floor Shipped by 
                    for the Energy Conservation Program for
                                                  the message.                                                  Manufacturer 
                                  Consumer Products Other Than
                                                    3. Postal Mail: Ms. Brenda Edwards,                      7. Walk-in Sited Within a Walk-In: A 
             Automobiles. The National Energy
                                                  U.S. Department of Energy, Building                           ‘‘Hybrid’’ Walk-In 
                            Conservation Policy Act (NECPA),


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                              55069

                                                  Public Law 95–619, amended EPCA to                      also requires that the test procedure not             performance standards become
                                                  add Part C of Title III, which established              be unduly burdensome to conduct. (42                  applicable, manufacturers must use the
                                                  an energy conservation program for                      U.S.C. 6314(a)(2)) As part of the process             test procedures to determine
                                                  certain industrial equipment. (42 U.S.C.                for promulgating a test procedure, DOE                compliance with the standards, and
                                                  6311–6317) (These parts were                            must publish a proposed procedure and                 DOE must use the test procedure to
                                                  subsequently redesignated as Parts A                    offer the public an opportunity to                    ascertain compliance with the standards
                                                  and A–1, respectively, for editorial                    present oral and written comments in                  in any enforcement action. Moreover,
                                                  reasons.) Section 312 of the Energy                     response to that procedure. DOE                       once any final test procedure is
                                                  Independence and Security Act of 2007                   solicited comments on the notice of                   effective, any representation as to the
                                                  (‘‘EISA 2007’’) further amended EPCA by                 proposed rulemaking (‘‘NOPR’’) setting                energy use of walk-in equipment must
                                                  adding certain equipment to this energy                 forth proposed test procedures,                       reflect the results of testing that
                                                  conservation program, including walk-                   published on January 4, 2010 (‘‘the                   equipment using the test procedure.
                                                  in coolers and walk-in freezers                         January NOPR’’). 75 FR 186. DOE also
                                                  (collectively ‘‘walk-in equipment,’’                                                                          III. Discussion
                                                                                                          held a public meeting to discuss the
                                                  ‘‘walk-ins,’’ or ‘‘WICF’’), the subject of              January 2010 NOPR on March 24, 2010.                     This section addresses issues raised
                                                  this rulemaking. (42 U.S.C 6311(1), (20),               DOE is now soliciting further comment                 by interested parties in response to the
                                                  6313(f), and 6314(a)(9))                                through this SNOPR.                                   January NOPR and provides detail
                                                     At its most basic level, the term                      The January NOPR and the March                      regarding DOE’s proposed changes to
                                                  ‘‘walk-in equipment’’ encompasses                       2010 meeting provided interested                      the test procedure. Interested parties
                                                  enclosed storage spaces of under 3,000                  parties an opportunity to submit                      include trade associations (American
                                                  square feet that can be walked into and                 comments on the proposals. Interested                 Chemistry Council/Center for the
                                                  are refrigerated to specified                           parties raised significant issues and                 Polyurethanes Industry (ACC/CPI),
                                                  temperatures—above 32 degrees                           suggested changes to the proposed test                AHRI); manufacturers of the covered
                                                  Fahrenheit (°F) for coolers and at or                   procedures. DOE determined that some                  equipment (Craig Industries, Metl-Span,
                                                  below 32 °F for freezers. (42 U.S.C.                    of these comments warrant further                     Nor-Lake, Carpenter, Master-Bilt,
                                                  6311(20)(A)) The term does not include                  consideration. In today’s notice, DOE                 American Panel Corporation, Arctic
                                                  equipment designed and marketed                         addresses those comments and proposes                 Industries, Amerikooler, Kason, Hill
                                                  exclusively for medical, scientific or                  adjustments to the initial test                       Phoenix, TAFCO/TMP (TAFCO),
                                                  research purposes. (42 U.S.C.                           procedures proposed for walk-in                       International Cold Storage (ICS),
                                                  6311(20)(B))                                            equipment in the January 2010 NOPR.                   ThermalRite, Manitowoc, Kysor Panel,
                                                     Walk-ins that meet this definition                                                                         HeatCraft, and Crown Tonka); suppliers
                                                  may be located indoors or outdoors.                     II. Summary of the Proposal                           of components used in the covered
                                                  They may be used exclusively for                           DOE is proposing several changes to                equipment (Honeywell, BASF, Dyplast,
                                                  storage, but they may also have                         the proposal presented in the January                 ITW Insulation, Owens Corning, HH
                                                  transparent doors or panels for the                     NOPR. These changes involve:                          Technologies (Hired Hand), Dow
                                                  purpose of displaying stored items.                        (1) Definition of walk-in cooler and               Chemical, and Schott Gemtron); utilities
                                                  Examples of items that may be stored in                 walk-in freezer.                                      (Southern California Edison (SCE), San
                                                  walk-ins include, but are not limited to,                  (2) Testing and compliance                         Diego Gas and Electric (SDGE), and the
                                                  food, beverages, and flowers.                           responsibility.                                       Sacramento Municipal Utility District
                                                     Under the Act, the overall program                      (3) Versions of standards incorporated             (SMUD)); and energy efficiency
                                                  consists of three parts: testing, labeling,             by reference.                                         advocates (American Council for an
                                                  and Federal energy conservation                            (4) Basic model for envelope.                      Energy-Efficient Economy (ACEEE)).
                                                  standards. The testing requirements                        (5) Basic model for refrigeration
                                                  consist of test procedures prescribed                   system.                                               A. Overall Issues
                                                  under the authority of EPCA. These test                    (6) Conduction through structural                  1. Definition of Walk-In Cooler or
                                                  procedures are used in several different                members.                                              Freezer: Temperature Limit
                                                  ways: (1) DOE uses them to aid in the                      (7) Alternatives to ASTM C1303.
                                                  development of standards for covered                       (8) Heat transfer through concrete.                   EPCA defines walk-in equipment as
                                                  products or equipment; (2)                                 (9) U-factor of glass and non-glass                follows:
                                                  manufacturers of covered equipment                      doors.                                                   (A) In general.—
                                                  must use them to establish that their                      (10) Steady-state infiltration through                The terms ‘‘walk-in cooler’’ and ‘‘walk-in
                                                  equipment complies with standards                       panel interfaces and doors.                           freezer’’ mean an enclosed storage space
                                                  promulgated under EPCA and when                            (11) Door opening infiltration                     refrigerated to temperatures, respectively,
                                                  making representations about                                                                                  above, and at or below 32 degrees Fahrenheit
                                                                                                          assumptions.                                          that can be walked into, and has a total
                                                  equipment efficiency; and (3) DOE must                     (12) Infiltration reduction device                 chilled storage area of less than 3,000 square
                                                  use them to determine whether                           effectiveness.                                        feet.
                                                  equipment complies with applicable                         (13) Relative humidity assumptions.                   (B) Exclusion.—
                                                  standards.                                                 (14) Definition of refrigeration system.              The terms ‘‘walk-in cooler’’ and ‘‘walk-in
                                                     Section 343 of EPCA (42 U.S.C. 6314)                    (15) Annual walk-in energy factor.                 freezer’’ do not include products designed
                                                  sets forth generally applicable criteria                   Concurrently, DOE is undertaking an                and marketed exclusively for medical,
                                                  and procedures for DOE’s adoption and                   energy conservation standards                         scientific, or research purposes. (42 U.S.C.
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                                                  amendment of such test procedures.                      rulemaking to address the statutory                   6311(20))
                                                  That provision requires that the test                   requirement to establish performance                    During the public meeting on the
                                                  procedures promulgated by DOE be                        standards for walk-in equipment no                    January NOPR and in written
                                                  reasonably designed to produce test                     later than January 1, 2012. (42 U.S.C.                comments, several interested parties
                                                  results which reflect energy efficiency,                6313(f)(4)(A)) DOE will use the test                  stated that DOE should clarify this
                                                  energy use, and estimated operating                     procedure in the concurrent process of                definition with respect to temperature
                                                  costs of the covered equipment during                   evaluating potential performance                      limits and exclusions. Multiple
                                                  a representative average use cycle. It                  standards for the equipment. After                    interested parties commented that DOE


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                                                  55070               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  should set an upper temperature limit                   temperature limit might inadvertently                 parts of the refrigeration system or
                                                  for walk-ins. Three temperature limits                  include a wider variety of conditioned                envelope.
                                                  were proposed: (1) 40 or 41 °F; (2) 45                  spaces than contemplated. (Hired Hand,                   In the January NOPR, DOE proposed
                                                  °F; and (3) between 31 °F and 55 °F.                    Public Meeting Transcript, No. 1.2.010                that the envelope manufacturer would
                                                  Kysor stated that DOE should align with                 at p. 87)                                             be responsible for testing the envelope
                                                  the National Sanitation Foundation                         EPCA defines walk-in equipment, in                 according to the envelope test
                                                  (NSF) definition of 41 °F as the                        part, as meaning a space that is                      procedure, and the refrigeration system
                                                  maximum high temperature for food                       ‘‘refrigerated,’’ and as having a ‘‘chilled           manufacturer would be responsible for
                                                  storage. (Kysor, Public Meeting                         storage area.’’ (42 U.S.C. 6311(20)) DOE              testing the refrigeration system
                                                  Transcript, No. 1.2.010 at p. 85) ICS                   proposes clarifying the term                          according to the refrigeration system test
                                                  agreed with Kysor but cautioned that                    ‘‘refrigerated’’ within the statutory                 procedure. 75 FR 191. DOE believed
                                                  this temperature could be different from                definition to distinguish walk-in                     that the manufacturers of the envelope
                                                  the temperature set by the customer.                    equipment from air-conditioned storage                and refrigeration systems—as parties
                                                  (ICS, Public Meeting Transcript, No.                    spaces. DOE could not find a consensus                most likely to be intimately familiar
                                                  1.2.010 at p. 86)                                       among the industry for the definition of              with the design and operation of their
                                                     In written comments, Kysor also                      ‘‘refrigerated’’ or ‘‘chilled storage.’’              own equipment—would be more likely
                                                  suggested 40 °F as the upper limit                      However, the Joint Comment, SCE, and                  than installers to have the resources,
                                                                                                          TAFCO suggested that 55 °F represented                equipment, and trained personnel
                                                  because NSF/ANSI Standard 7,
                                                                                                          a boundary between ‘‘refrigerated space’’             needed to conduct the tests necessary to
                                                  ‘‘Commercial Refrigerators and Freezers’’
                                                                                                          and ‘‘conditioned space’’ as refrigeration            certify WICF equipment as compliant
                                                  uses such a requirement. See NSF/ANSI
                                                                                                          systems typically do not operate above                with any energy conservation standards
                                                  Standard 7, ‘‘Commercial Refrigerators
                                                                                                          55 °F, and air-conditioning systems                   that DOE develops. 75 FR 191.
                                                  and Freezers,’’ Section 6.10.1,                                                                                  However, interested parties
                                                  ‘‘Performance (‘‘Storage refrigerators and              typically do not operate below this
                                                                                                                                                                commented that DOE’s concept of a
                                                  refrigerated food transport cabinets shall              limit. DOE found that preparation
                                                                                                                                                                single envelope manufacturer may not
                                                  be capable of maintaining an air                        rooms, wine coolers, and storage coolers
                                                                                                                                                                align with the actual market.
                                                  temperature of 40 °F (4 °C) or lower in                 for most fruits and vegetables are                    Commenters suggested that the panel
                                                  the interior.’’) (Kysor, No. 1.3.035 at p.              considered refrigerated spaces and are                manufacturers, whom DOE assumed
                                                  1) Craig and Hired Hand both indicated                  typically cooled to temperatures                      would serve as the envelope
                                                  that 45 °F or 41 °F would be an                         between 45 °F and 55 °F. DOE proposes                 manufacturers for purposes of testing
                                                  acceptable upper limit. (Craig, Public                  adopting a clarifying definition that                 compliance, did not necessarily control
                                                  Meeting Transcript, No. 1.2.010 at p. 86;               would set an upper limit of 55 °F for                 the design of the walk-in envelopes for
                                                  Craig, No. 1.3.017 at p. 1 and Public                   walk-in equipment. DOE believes that                  which their panels were used. Many of
                                                  Meeting Transcript, No. 1.2.010 at p. 19;               using the upper limit of food storage                 the comments from interested parties
                                                  Hired Hand, Public Meeting Transcript,                  temperatures (i.e., 40 °F or 45 °F) to                suggested that DOE should assign
                                                  No. 1.2.010 at p. 88) A comment                         define walk-in equipment, as suggested                compliance testing responsibility to
                                                  submitted jointly by SCE, SDGE, and                     by some commenters, would exclude                     parties involved in the physical
                                                  SMUD, hereafter referred to collectively                some equipment that is ‘‘refrigerated’’               assembly (e.g., installers) and/or design-
                                                  as ‘‘the Joint Comment,’’ recommended                   and has a ‘‘chilled storage area.’’ Such an           level specification (e.g., general
                                                  that DOE develop a definition to clarify                approach would, in DOE’s view,                        contractors) of the walk-in envelope
                                                  that walk-in coolers operate at                         exclude from coverage equipment that                  because actions taken by these parties
                                                  temperatures between 55 °F and 32 °F.                   falls within the statutorily-prescribed               could have a significant effect on walk-
                                                  (Joint Comment, No. 1.3.019 at p. 17)                   scope of EPCA’s walk-in definition. The               in performance over its lifetime. Some
                                                  SCE pointed out that California’s                       space in which a walk-in is located (e.g.,            commenters suggested various forms of
                                                  building energy standards consider 55                   a grocery store, warehouse, or other                  joint responsibility between the
                                                  °F and below to be refrigerated. (SCE,                  conditioned space) would not itself be                manufacturer(s) of the envelope
                                                  Public Meeting Transcript, No. 1.2.010                  considered a walk-in unless it meets the              components and the parties responsible
                                                  at p. 85) TAFCO agreed that DOE should                  statutory definition of a walk-in and                 for the physical assembly and/or design-
                                                  impose an upper limit of 55 °F because                  DOE’s proposed clarifying definition                  level specification of the envelope.
                                                  this is the highest temperature at which                that would set an upper limit on the                  Other interested parties commented that
                                                  most refrigeration systems will operate.                temperature range. DOE requests                       these options would not constitute a
                                                  (TAFCO, No. 1.3.022 at p. 1) Craig                      comment on its proposal of clarifying                 viable approach and that DOE should
                                                  disagreed with a 55 °F limit because this               ‘‘refrigerated’’ to mean at or below 55 °F.           focus on the panel manufacturers for
                                                  temperature is the typical holding                      2. Testing and Compliance                             compliance testing because they would
                                                  temperature for wine coolers, but the                   Responsibility                                        be more likely to have the proper
                                                  walk-in wine cooler might be rated at a                                                                       equipment and expertise to test the
                                                  lower temperature. (Craig, Public                          In responding to comments received                 panels.
                                                  Meeting Transcript, No. 1.2.010 at p. 86)               on the framework document, the                           Likewise, interested parties
                                                  DOE infers from the comment that Craig                  January NOPR detailed DOE’s proposal                  commented that DOE’s concept of a
                                                  was concerned that the energy                           to create separate test procedures for the            single refrigeration system manufacturer
                                                  consumption of a wine cooler at the test                envelope and the refrigeration system,                may be inaccurate because the
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  procedure rating temperature might not                  the two discrete systems that comprise                condensing unit and unit cooler of a
                                                  represent the energy consumption at the                 a walk-in. 75 FR 191. These two systems               single refrigeration system may be
                                                  actual holding temperature. Hired Hand                  may or may not each be manufactured                   manufactured by separate entities and
                                                  stated that air conditioning is the first               by a separate manufacturing entity.                   the whole system may be manufactured
                                                  stage of cooling for walk-ins inside air-               Additionally, other manufacturers may                 from these separate parts by a third
                                                  conditioned warehouses, which echoed                    be involved in producing secondary                    manufacturer. Commenters generally
                                                  the concerns of other commenters that                   components—such as fan assemblies or                  suggested assigning joint responsibility
                                                  the complete absence of an upper                        lighting—that are then incorporated as                between the manufacturer(s) of the unit


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                          55071

                                                  cooler and condensing unit and the                      consumption characteristics.’’ 75 FR                  modeling. (Hill Phoenix, No. 1.3.023 at
                                                  manufacturer of the system as a whole.                  189.                                                  p. 2)
                                                  Others suggested that DOE break a                          Master-Bilt, BASF, ACC/CPI, Craig,                    Several interested parties requested
                                                  refrigeration system down into its                      Kason, and ThermalRite supported the                  clarification of the proposed definition
                                                  individual components (e.g.,                            concept of the basic model for WICF                   of basic model. ACC/CPI and Honeywell
                                                  compressor, coils) and regulate each                    envelopes. (Master-Bilt, No. 1.3.009 at p.            recommended that different types of
                                                  component separately.                                   1; BASF, No. 1.3.003 at p. 3; ACC/CPI,                foam and/or different blowing agents
                                                     DOE believes that many of the                        No. 1.3.006 at p. 2 and No. 1.3.028 at                should trigger different basic models
                                                  comments concerning compliance                          p. 1; Craig, Public Meeting Transcript,               (ACC/CPI, No. 1.3.006 at p. 2 and Public
                                                  testing responsibility stem from the                    No. 1.2.010 at p. 102; Kason, No. 1.3.037             Meeting Transcript, No. 1.2.010 at p. 43;
                                                  definition of the term ‘‘manufacture,’’                 at p. 1 and Public Meeting Transcript,                Honeywell, No. 1.3.020 at p. 1)
                                                  which EPCA defines as ‘‘to manufacture,                 No. 1.2.010 at p. 124; and ThermalRite,               Honeywell also recommended that a
                                                  produce, assemble or import.’’ (42 U.S.C.               No. 1.3.031 at p. 1) Craig supported an               different facer material should trigger a
                                                  6291(10)) Several interested parties                    approach consisting of a single basic                 new basic model. (Honeywell, No.
                                                  requested clarification of the definition               model test on a baseline model and                    1.3.020 at p. 1) Owens Corning stated
                                                  of ‘‘manufacture’’ and the implications                 adding component loads. (Craig, Public                that the insulation material should not
                                                  of that role. DOE generally requires a                  Meeting Transcript, No. 1.2.010 at p.                 trigger a new basic model because the R-
                                                  single party, whose role falls under the                123) Kason stated that the basic model                value of the insulation is addressed in
                                                  term ‘‘manufacture,’’ to assume                         test should include provisions at the                 EISA and that panel construction
                                                  compliance responsibility for a given                   component level, where manufacturers                  (framed or frameless) should be used to
                                                  appliance or equipment; typically, the                  could pick new components as long as                  differentiate between basic models.
                                                  party responsible for demonstrating                     the components were certified to exceed               (Owens Corning, No. 1.3.030 at p. 2) ICS
                                                  compliance would conduct the                            the performance of the old components.                stated that different applications should
                                                  necessary testing or arrange for testing                (Kason, Public Meeting Transcript, No.                constitute different basic models:
                                                  to be conducted by a third party (e.g.,                 1.2.010 at p. 124) Kysor and Nor-Lake                 holding storage, quick chilling or
                                                  a testing lab). DOE recognizes that the                 both believed that the concept of the                 freezing, or blast freezing. (ICS, No.
                                                  walk-in envelope and refrigeration                      basic model may not be realistic if                   1.3.027 at p. 1) TAFCO commented that
                                                  system markets rely on multiple supply                  envelope components such as doors and                 the use of strip curtains or air curtains
                                                  chain scenarios in which several                                                                              should not constitute a new basic
                                                                                                          lights were not purchased or installed
                                                  distinct parties could serve different                                                                        model. (TAFCO, No. 1.3.022 at p. 2)
                                                                                                          by the panel manufacturers; in that case,
                                                  roles that may fall under the term                                                                               Other interested parties requested that
                                                                                                          Kysor and Nor-Lake stated that                        DOE specify standard characteristics for
                                                  ‘‘manufacture.’’ In the case of both walk-
                                                                                                          component manufacturers should be                     a certain basic unit that every
                                                  in envelopes and refrigeration systems,
                                                                                                          responsible for rating individual                     manufacturer would test. American
                                                  DOE recognizes that assigning
                                                                                                          components. (Nor-Lake, No. 1.3.029 at                 Panel, ThermalRite, and Craig
                                                  compliance responsibility to a single
                                                                                                          p. 2; Kysor, No. 1.3.035 at p. 2) Arctic              recommended that DOE specify a
                                                  entity that may not be involved in all
                                                                                                          proposed expanding the basic model                    standardized basic model size.
                                                  aspects of the design and construction
                                                                                                          concept to eliminate testing for units                (American Panel, No. 1.3.024 at p. 2;
                                                  of these systems may present certain
                                                                                                          using the same materials and                          ThermalRite, No. 1.3.031 at p. 1; Craig,
                                                  logistical issues. Accordingly, DOE
                                                  plans to further address these issues                   construction methods as a previously                  Public Meeting Transcript, No. 1.2.010
                                                  during the standards rulemaking when                    certified model, adding that it would be              at pp. 102, 106, and 119) Craig
                                                  developing the required efficiency                      impractical and infeasible for them to                suggested a basic size applicable to the
                                                  levels and when developing                              test every kind of equipment they                     food industry—an 8 foot × 10 foot cooler
                                                  certification and compliance                            manufacture because of the great variety              and a 6 foot × 8 foot freezer, both with
                                                  responsibilities.                                       of box dimensions. (Arctic, No. 1.3.012               a height of 7 feet 6 inches tall—and
                                                                                                          at p. 1) BASF and Kason also stated that              added that size would only be
                                                  3. Basic Model of Envelope                              manufacturers must be able to reduce                  applicable to the infiltration test
                                                     Although often manufactured                          the number of models to test to ensure                because other characteristics could be
                                                  according to the same basic design,                     minimal manufacturer burden. (BASF,                   calculated. (Craig, Public Meeting
                                                  many walk-in envelopes can be highly                    No. 1.3.003 at p. 3 and Kason, No.                    Transcript, No. 1.2.010 at p. 105 and No.
                                                  customized. To address this possibility,                1.3.037 at p. 1)                                      1.2.010 at pp. 102, 106, and 119) Kysor
                                                  DOE proposed the following approach                        Other interested parties disagreed                 suggested that only height could be
                                                  in the January NOPR: (1) Grouping                       with the proposed basic model                         specified, arguing that walk-ins cannot
                                                  walk-in envelopes with essentially                      approach. Bally stated that the company               be characterized by size. (Kysor, Public
                                                  identical construction methods,                         produces tens of thousands of basic                   Meeting Transcript, No. 1.2.010 at p.
                                                  materials, and components into a single                 models, making basic model testing                    106)
                                                  basic model; and (2) adopting a                         infeasible. (Bally, Public Meeting                       Finally, interested parties commented
                                                  calculation methodology for                             Transcript, No. 1.2.010 at p. 132) Hill               on the proposed scaling methodology
                                                  determining the energy consumption of                   Phoenix believed that use of a basic                  associated with the basic model
                                                  units within the basic model. For walk-                 model for testing would not accurately                concept. Manitowoc stated that a scaling
                                                  in envelopes, DOE proposed to define a                  represent the energy usage of most walk-              methodology based on surface area
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                                                  ‘‘basic model’’ as ‘‘all units of a given               ins because of equipment variability,                 would not give an accurate
                                                  type of walk-in equipment                               that an energy usage calculation                      representation of energy use because
                                                  manufactured by a single manufacturer,                  program would have to be created and                  energy scales not only with surface area
                                                  and—(1) With respect to envelopes,                      maintained and be consistent across the               but with other factors as well such as
                                                  which do not have any differing                         industry, and that basic model testing                the number of installed doors and door
                                                  construction methods, materials,                        would require costly government                       size. In other words, individual
                                                  components, or other characteristics                    oversight. Instead, Hill Phoenix                      component loads scale with individual
                                                  that significantly affect the energy                    recommended component-level                           component characteristics. (Manitowoc,


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                                                  55072               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  Public Meeting Transcript, No. 1.2.010                  measures include incorporating scaling                physically tested (i.e., the geometry of a
                                                  at p. 108) ThermalRite also questioned                  factors for the infiltration test (section            panel test sample), instead of specifying
                                                  whether there is a linear relationship                  III.B.9), the panel U-factor test (section            characteristics of the tested walk-in unit
                                                  between energy consumption and WICF                     III.B.1), and representative doorway                  as a whole as suggested by American
                                                  size that would allow for scaling.                      sizes for infiltration reduction device               Panel, ThermalRite, Craig, and Kysor,
                                                  (ThermalRite, Public Meeting                            testing. With these measures, DOE                     because (1) complete walk-in units may
                                                  Transcript, No. 1.2.010 at p. 110)                      attempts to minimize the number of                    be very different from one another even
                                                     Upon consideration of these                          physical tests that would need to be                  if they use similar components, and (2)
                                                  comments, DOE believes that the basic                   performed for the test procedure and                  the scaling calculations are more
                                                  model concept would provide                             instead provide a calculation                         accurate on the component level than
                                                  manufacturers with a standardized                       methodology that would allow for rating               on the level of the entire walk-in, which
                                                  method of categorizing their products.                  equipment based on physical tests                     supports testing certain components as
                                                  However, the definition of basic model                  conducted on other equipment. DOE                     part of the compliance procedure. For
                                                  proposed in the January NOPR could                      believes that this approach would                     additional details on these proposed
                                                  make the concept difficult to use as                    sufficiently address the concerns of                  component tests, see section III.B.
                                                  originally intended to reduce testing                   BASF, Kason, Arctic, Bally, and Hill
                                                  burden. Specifically, the phrase ‘‘* * *                                                                         With respect to certification, in
                                                                                                          Phoenix regarding the number of basic
                                                  characteristics that significantly affect                                                                     general, DOE requires that
                                                                                                          models to be tested and the cost of
                                                  the energy consumption * * *’’ could                                                                          manufacturers of a covered basic model
                                                                                                          testing. A DOE-specified calculation
                                                  be interpreted inconsistently by                                                                              submit a certification report providing
                                                                                                          methodology would also address Hill
                                                  manufacturers. The paragraphs below                                                                           details, which demonstrate compliance
                                                                                                          Phoenix’s recommendation that the
                                                  describe DOE’s proposed alternative                                                                           with the applicable energy conservation
                                                                                                          energy use calculation program be
                                                  approach to defining the term ‘‘basic                                                                         standards or design standards
                                                                                                          consistent across the industry.
                                                  model’’. Additionally, feedback from                                                                          prescribed by DOE or established by
                                                                                                          Regarding Arctic’s view that the basic
                                                  interested parties indicated a desire for                                                                     Congress. DOE estimates that
                                                                                                          model concept should be expanded to
                                                  DOE to specify prescriptive design                                                                            approximately 50 percent of the market
                                                                                                          include similar units with the same
                                                  characteristics for a basic model.                      materials and construction methods that               consists of standardized walk-ins that
                                                  Because EPCA requires DOE to                            have been previously certified, DOE                   are produced in large quantities. For the
                                                  promulgate performance-based                            notes that models with the same                       other half of the market, walk-ins may
                                                  standards for this equipment, DOE does                  characteristics as previously certified               have custom features and components
                                                  not intend to specify design                            models would be considered the same                   that could qualify each as a different
                                                  characteristics that do not affect                      basic model only if they met the                      basic model. In this situation,
                                                  normalized energy consumption, as                       conditions in the basic model                         manufacturers could produce many
                                                  suggested by ACC/CPI, Honeywell,                        definition. In other words, the models                basic models in a year.
                                                  Owens Corning, ICS and TAFCO. See 42                    would need to have the same                              DOE is unsure, however, how
                                                  U.S.C. 6313(f) (instructing DOE to set                  manufacturer and not have any differing               burdensome this would be in terms of
                                                  performance-based standards for walk-                   characteristics that affect normalized                the actual number of hours or personnel
                                                  ins).                                                   energy consumption.                                   required to certify additional basic
                                                     DOE is considering adopting a revised
                                                                                                             The proposed test procedure revisions              models under this approach. If requiring
                                                  definition of the term ‘‘basic model’’ that
                                                                                                          considered in this SNOPR also rely                    a certification report for each basic
                                                  would be consistent with the definition
                                                                                                          more heavily on component testing,                    model under the approach outlined in
                                                  of basic model used elsewhere in the
                                                  appliance standards program, improve                    consistent with the suggestions made by               today’s SNOPR would impose an
                                                  the clarity of the definition, and narrow               Craig, Kason, Kysor, Nor-Lake, and Hill               unreasonable burden, DOE may
                                                  the scope of the basic model concept.                   Phoenix. This approach removes the                    consider a compliance certification
                                                  Most notably, this revision would not                   burden of testing an entire walk-in for               approach similar to that taken for
                                                  allow walk-in models to differ in terms                 which only one component is different                 distribution transformers (another case
                                                  of their normalized energy                              from a previously rated walk-in: the test             in which some equipment is highly
                                                  consumption. Models grouped within a                    procedure revisions in this SNOPR                     customized). 10 CFR 431.371(a)(6)(ii).
                                                  basic model could still differ in terms of              would allow for testing the new                       Distribution transformer manufacturers
                                                  their non-energy characteristics (e.g.,                 component and then using the proposed                 are required to maintain records on all
                                                  color, shelving, metal skin material                    calculation methodology to obtain the                 basic models sold (or built), but must
                                                  type, exterior finish, door kick-plate) but             new rating of the walk-in. Additionally,              submit a compliance report to DOE that
                                                  any change to a characteristic that                     the proposed component tests allow for                certifies only the least efficient basic
                                                  affects normalized energy consumption                   testing one component and then                        model within larger groupings that may
                                                  (e.g., panel systems, door systems,                     applying those results to other                       encompass many basic models. 10 CFR
                                                  electrical components, and infiltration                 components that meet certain similar                  431.371(a)(6)(ii). The manufacturer
                                                  reduction devices) would constitute a                   criteria. DOE believes this method is                 would certify that every other
                                                  new basic model.                                        more accurate than allowing for scaling               transformer in the larger grouping is no
                                                     DOE’s proposed revision, while                       of the entire walk-in, because each                   less efficient than the certified basic
                                                  reducing the possibility of inconsistent                walk-in could contain many customized                 model certified to DOE. Given the
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                                                  interpretation of the term ‘‘basic model’’,             parts. Adopting this method would                     nature of the market, DOE is willing to
                                                  could increase the testing burden                       address the concerns raised by                        consider variations on this approach for
                                                  relative to the burden under the                        Manitowoc and ThermalRite that energy                 walk-ins, such as requiring certification
                                                  definition of ‘‘basic model’’ as proposed               may not scale directly with walk-in                   for the least and most efficient basic
                                                  in the January NOPR. Some of the                        external surface area or other size                   models within a larger group. Such an
                                                  burden may be offset, however, by                       characteristics. For some proposed                    approach could help address the
                                                  burden-reducing measures proposed                       component tests, DOE specifies                        concern of Hill Phoenix about the cost
                                                  elsewhere in the test procedure. These                  characteristics of the part that must be              of an oversight strategy.


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                           55073

                                                    DOE requests comment on its                           making it unnecessary to test all                     of the refrigeration system.
                                                  proposed definition and approach                        combinations but only individual parts                Nevertheless, DOE believes that listing
                                                  regarding basic models for envelopes.                   of the system. (Manitowoc, Public                     only certain components where changes
                                                                                                          Meeting Transcript, No. 1.2.010 at p.                 would constitute a new basic model
                                                  4. Basic Model of Refrigeration Systems
                                                                                                          158)                                                  could overlook changes to other
                                                     In the January NOPR, DOE proposed                       TAFCO identified refrigeration system              components that affect energy
                                                  that the definition of the term ‘‘basic                 components that, if changed, would                    consumption. In addition, the question
                                                  model’’ in the context of a refrigeration               significantly affect energy consumption.              of significance would remain under
                                                  system would refer to all units with the                These components include the                          such an approach. DOE believes that the
                                                  same energy source and without any                      compressor, condensing coil, fan                      definition proposed here is sufficient to
                                                  different electrical, physical, and                     motors, head pressure control, and                    define basic model—a basic model
                                                  functional characteristics that affect                  evaporator coil. (TAFCO, No. 1.3.022 at               would necessarily have to include all
                                                  energy consumption. DOE then stated                     p. 2) American Panel added that                       components that affect energy
                                                  during the NOPR public meeting that it                  headmasters (which control pressure)                  consumption.
                                                  was considering a new definition that                   must be included on outdoor                              DOE also acknowledges the concerns
                                                  would not allow units within a basic                    condensing units if the unit will be                  of interested parties, specifically Master-
                                                  model to differ in energy consumption.                  exposed to low temperatures. (American                Bilt, HeatCraft, and Nor-Lake, that a
                                                  DOE also stated during the public                       Panel, No. 24 at p. 3) Some interested                manufacturer could produce many
                                                  meeting that it would consider the                      parties discussed whether DOE should                  condensing unit and unit cooler
                                                  default of including no provision for a                 specify certain characteristics of the                combinations—i.e., many basic models
                                                  basic model, under which                                basic model. Specifically, HeatCraft                  —and that testing could be burdensome.
                                                  manufacturers would be required to test                 stated that the basic model should                    DOE notes that the proposed
                                                  every model they manufacture.                           include some common parts such as a                   refrigeration system test procedure,
                                                     AHRI and ACEEE agreed with DOE’s                     filter dryer to permit a valid comparison             AHRI 1250–2009, allows for testing the
                                                  proposed approach and definition of                     between manufacturers, but                            condensing unit and unit cooler
                                                  basic model. (AHRI, No. 1.3.032 at p. 2                 manufacturers should be allowed to add                separately and then, using the
                                                  and Public Meeting Transcript, No.                      unique features. (HeatCraft, Public                   calculation methodology in AHRI 1250–
                                                  1.2.010 at p. 169; ACEEE, No. 1.3.034 at                Meeting Transcript, No. 1.2.010 at p.                 2009, determining the performance of
                                                  p. 2) Craig also agreed with the                        162) ACEEE agreed that the basic model                the combined system, similar to the
                                                  proposed approach given that                            should include parts that have a                      approach suggested by Manitowoc.
                                                  improvements could be applied to                        reasonable probability of affecting                   Under this approach, each combination
                                                  existing systems. (Craig, Public Meeting                energy consumption to encourage                       would not have to be tested, which
                                                  Transcript, No. 1.2.010 at p. 172) ICS,                 manufacturers to include all necessary                would decrease the number of physical
                                                  Manitowoc, and HeatCraft                                components in their WICF equipment.                   equipment tests, even though each
                                                  recommended that the basic model of                     (ACEEE, Public Meeting Transcript, No.                different combination would be
                                                  refrigeration be allowed to vary                        1.2.010 at p. 168) AHRI disagreed,                    considered a different basic model and
                                                  minimally (a 5 percent tolerance) in                    stating that DOE should not specify                   would receive a different rating.
                                                  energy consumption, while HeatCraft                     design requirements in defining basic                    At this time, DOE does not intend to
                                                  also stated that in Europe, the tolerance               model groups, but rather agreed with                  incorporate a tolerance into the
                                                  is typically 8 percent. (ICS, No. 1.3.027               DOE’s proposed definition. (AHRI,                     definition of basic model, as suggested
                                                  at p. 1; Manitowoc, Public Meeting                      Public Meeting Transcript, No. 1.2.010                by ICS, Manitowoc, and HeatCraft, in
                                                  Transcript, No. 1.2.010 at p. 159; and                  at p. 169) (Although ACEEE did not                    order to ensure that the rating applying
                                                  HeatCraft, Public Meeting Transcript,                   elaborate further on what it considers                to each basic model is as accurate as
                                                  No. 1.2.010 at p. 162) On the other                     ‘‘all necessary components,’’ DOE is                  possible. DOE notes that one potential
                                                  hand, Master-Bilt expressed concern                     interpreting this phrase as referring to              issue with introducing a tolerance
                                                  that too many refrigeration system                      any components that would be needed                   approach may be that neither DOE nor
                                                  combinations may exist for the basic                    to have the unit work in a manner as                  the eventual purchaser of the equipment
                                                  model concept to be applied effectively.                designed without the addition of                      could expect that the rating of a
                                                  (Master-Bilt, No. 1.3.009 at p. 1)                      aftermarket components that would                     particular model would be equal to that
                                                  HeatCraft stated that it was concerned                  impact the equipment’s energy usage.)                 model’s actual energy consumption. It is
                                                  about testing highly variable                              As with envelopes, DOE must ensure                 unclear to DOE how significant this
                                                  refrigeration systems and combinations,                 that all refrigeration systems are                    issue may be if such an approach were
                                                  and whether they would be able to                       accurately rated and comply with the                  adopted.
                                                  incorporate new technologies.                           standard. To avoid differing                             DOE acknowledges, however, that
                                                  (HeatCraft, Public Meeting Transcript,                  interpretations of what a ‘‘significant               units within a basic model are expected
                                                  No. 1.2.010 at p. 42) Nor-Lake was also                 difference’’ in energy consumption                    to differ slightly as a result of
                                                  concerned about the potential testing                   might be, DOE believes that it is                     manufacturing and materials variations.
                                                  burden because it has distinct energy                   appropriate to clarify certain aspects of             As a result, DOE may consider
                                                  efficiency ratio values on over 250                     that definition to eliminate differences              accounting for these variations in
                                                  models. It recommended either defining                  in the measured energy consumption of                 sampling plans used for compliance
                                                  basic model to account for how many                     models belonging to the same basic                    testing and developed as part of any
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                                                  basic models a manufacturer would                       model group. Accordingly, DOE                         future certification and enforcement
                                                  have or to replace the basic model                      proposes a revised definition of basic                rulemaking. DOE’s existing compliance
                                                  approach with a component-based one.                    model of refrigeration where units                    and certification regulations, developed
                                                  (Nor-Lake, No. 1.3.005 at pp. 2 and 5                   cannot differ in electrical, physical, or             for certain other commercial equipment,
                                                  and No. 1.3.029 at p. 2) Manitowoc                      functional characteristics that affect                provide that when a random sample of
                                                  suggested considering a unit cooler its                 energy consumption. DOE recognizes                    equipment is taken for determining
                                                  own basic model (not the combination                    that the components identified by                     compliance with the standard for
                                                  of unit cooler and condensing unit),                    TAFCO affect the energy consumption                   commercial refrigeration equipment,


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                                                  55074               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  represented values of estimated energy                  components. The proposed procedure                    agreed with the approach of
                                                  consumption of a basic model shall be                   uses data obtained from these methods                 determining the performance of the
                                                  no less than the higher of the mean of                  to calculate a measure of energy use                  panel as a whole and recommended that
                                                  the test sample or the upper 95 percent                 associated with the envelope by                       DOE use ASTM C1363–05, ‘‘Standard
                                                  confidence limit of the true mean                       calculating the effect of the envelope’s              Test Method for Thermal Performance
                                                  divided by 1.10. 75 FR 652, 666–71 (Jan.                characteristics and components on the                 of Building Materials and Envelope
                                                  5, 2010), codified at 10 CFR 431.372.                   energy consumption of the walk-in as a                Assemblies by Means of a Hot Box
                                                  This rule also provides that, in                        whole. These characteristics and                      Apparatus,’’ for evaluating the fully
                                                  enforcement proceedings, DOE’s                          components would include the energy                   assembled panel. (Metl-Span, No.
                                                  determination that a basic model                        consumption of electrical components                  1.3.004 at p. 1; BASF, No. 1.3.003 at p.
                                                  complies with the standard is based on                  present in the envelope (such as lights)              2; Kysor, No. 1.3.035 at p. 2; ACC/CPI,
                                                  a confidence limit which accounts for                   and variation in the energy                           No. 1.3.006 at p. 2)
                                                  statistical variation within a basic                    consumption of the refrigeration system                  In view of these comments, DOE
                                                  model. 75 FR 674, codified at 10 CFR                    due to heat loads introduced as a                     proposes to account for conduction
                                                  part 431, Appendix D to Subpart T.                      function of envelope performance, such                through structural members, as urged by
                                                     These sampling provisions are only                   as conduction of heat through the walls               Craig and American Panel, by
                                                  intended to reduce the burden on                        of the envelope. The effect on the                    measuring the overall U-factor of fully
                                                  manufacturers associated with                           refrigeration system would be                         assembled panels as recommended by
                                                  certification and enforcement.                          determined by calculating the energy                  the Joint Comment. All panels (walls,
                                                  Manufacturers would still be required to                consumption of a theoretical or                       ceiling, and floor) would be tested using
                                                  use the test procedure to rate their                    ‘‘nominal’’ refrigeration system if it were           ASTM C1363–05 for measuring the
                                                  equipment and, once energy                              paired with the tested envelope. The                  overall U-factor of fully assembled
                                                  conservation standards take effect, to                  test procedure uses the same nominal                  panels, as stated by Metl-Span, BASF,
                                                  determine whether each basic model of                   refrigeration system efficiency for all               Kysor, and ACC/CPI. The resulting
                                                  the equipment they manufacture                          tested envelopes to allow for direct                  composite panel U-factor from ASTM
                                                  complies with the standard.                             comparison of the performance of walk-                C1363–05 would then be corrected
                                                     As discussed above for envelopes,                    in envelopes across a range of sizes,                 using the LTTR results from ASTM
                                                  DOE could consider a compliance                         product classes, and levels of feature                C1303–10, if foam is used as the
                                                  certification approach similar to that                  implementation.                                       primary insulating material. See section
                                                  taken for distribution transformers                                                                           3.1.6 of Appendix A for details. DOE
                                                  (another case in which some equipment                   1. Heat Conduction Through Structural                 believes using the results from ASTM
                                                  is highly customized) to reduce the                     Members                                               C1363–05 modified by ASTM C1303–10
                                                  burden while ensuring that the energy                      In the January NOPR, DOE proposed                  best captures the effect of structural
                                                  conservation standards are being met.                   that the long-term thermal resistance                 members and long-term R-value of foam
                                                  10 CFR 431.371(a)(6)(ii). DOE describes                 (LTTR) value of the insulating foam                   products.
                                                  this approach in detail in section III.A.3.             after 5 years of equivalent aging be                     DOE recognizes the burden involved
                                                     DOE requests comment on the                          determined using ASTM C1303–08,                       when testing an entire representative
                                                  definition of and approach to basic                     ‘‘Standard Test Method for Predicting                 walk-in using ASTM C1363–05; i.e.,
                                                  model of refrigeration systems.                         Long-Term Thermal Resistance of                       requiring a representative walk-in
                                                                                                          Closed-Cell Foam Insulation.’’ This                   composed of 18 panels to be tested 18
                                                  B. Envelope
                                                                                                          value would be used as the R-value for                times. DOE also notes that testing a
                                                     The envelope consists of the insulated               all non-glass envelope sections                       single representative panel would be
                                                  box in which items are stored and                       constructed with foam insulation, for                 less burdensome but very inaccurate.
                                                  refrigerated. To meet one element of the                purposes of calculating the energy                    Panels are often manufactured in
                                                  statutory requirement that the DOE test                 consumption of the walk-in. Other                     dimensions close to 8 feet long by 4 feet
                                                  procedure ‘‘measure the energy use’’ of                 components of the panel, such as                      wide, but panel geometry frequently
                                                  walk-ins (42 U.S.C. 6314(a)(9)(B)(i)),                  structural members, were not included                 deviates from this size as walk-ins are
                                                  DOE had proposed to incorporate a                       in the conduction calculations of the                 made larger. In addition, structural
                                                  metric for the energy use associated                    test procedure.                                       members are normally placed in the
                                                  with the envelope of a walk-in cooler or                   Craig, Owens Corning, and American                 perimeter of panels (if used at all).
                                                  walk-in freezer. Under the applicable                   Panel pointed out that conduction                     Therefore, the heat transfer of a given
                                                  EPCA definition of ‘‘energy use’’—the                   through structural members must be                    panel is most closely related to the ratio
                                                  amount of energy directly consumed by                   considered when determining the R-                    of perimeter structural materials to non-
                                                  a piece of equipment at the point of use                value of a composite walk-in insulation               perimeter core panel materials.
                                                  (42 U.S.C. 6311(4))—DOE has                             panel. (Craig, No. 1.3.036 at p. 3 and                   If DOE were to require an ASTM
                                                  tentatively determined that the energy                  Public Meeting Transcript, No. 1.2.010                C1363–05 test using only one panel size,
                                                  use of a walk-in envelope is the sum of                 at pp. 20 and 61; Owens Corning, Public               the test would be representative of only
                                                  (1) the electrical energy consumption of                Meeting Transcript, No. 1.2.010 at p. 56;             this single perimeter-to-core ratio. If a
                                                  envelope components and (2) other                       and American Panel, No. 1.3.024 at p.                 walk-in were constructed of panels that
                                                  energy consumption of the walk-in                       3) The Joint Comment recommended                      deviated from this representative size in
                                                  equipment resulting from the heat                       that the current R-value requirement for              either extreme (i.e., much smaller or
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                                                  transfer performance of the envelope.                   the foam be converted to an overall U-                larger), the resulting energy calculations
                                                     The proposed envelope test procedure                 factor requirement for the assembled                  could be inaccurate. To balance the
                                                  contains methods for evaluating the                     panel. (Joint Comment, No. 1.3.019 at p.              competing interests of minimizing
                                                  performance characteristics of                          11) (U-factor is a measure of heat                    burden while ensuring measurement
                                                  insulation, testing thermal energy gains                transmission, including conduction and                accuracy, DOE is proposing to specify
                                                  related to air infiltration and                         radiation. A lower U-factor indicates a               two test regions of a pair of
                                                  determining direct electricity use and                  lower rate of heat transmission.) Metl-               representative panels. At one test
                                                  heat gain due to internal electrical                    Span, BASF, Kysor, and ACC/CPI                        region, the tester would measure the U-


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                                                                             Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                                                        55075

                                                  factor of the perimeter and panel-to-                                   C1303–10, which, as discussed in                                          recognized that using ASTM C1303–10
                                                  panel interface area (‘‘Panel Edge’’),                                  section III.B.4, DOE is now proposing to                                  would require testing foams without
                                                  while at the other region the tester                                    adopt as part of this test procedure. All                                 their metal facers because the test
                                                  would measure the U-factor of the core                                  references to ASTM C1303 in today’s                                       procedure was designed for unfaced or
                                                  area of the panel (‘‘Panel Core’’). The                                 notice refer to the ASTM C1303–10                                         permeably faced foams. In the published
                                                  details of this procedure are described                                 version of the protocol.) As discussed                                    NOPR and at the NOPR public meeting,
                                                  in section 4.1.1 of Appendix A.                                         later in section III.B.3, DOE also                                        DOE requested that interested parties
                                                    DOE seeks comment on the use of                                       proposes, in the alternative, the use of                                  submit data related to using ASTM
                                                  ASTM C1363–05 for this portion of the                                   EN 13165:2009–02 (a European-                                             C1303–10 for walk-ins.
                                                  test procedure.                                                         developed material standard), and seeks
                                                                                                                          comment on the use of these                                                 DOE received many comments related
                                                  2. Use of ASTM C1303 or EN                                              procedures.                                                               to ASTM C1303–10. Supporting
                                                  13165:2009–02                                                              DOE recognizes that R-value decline                                    documents submitted during the
                                                     In the January NOPR, DOE proposed                                    occurs over time in unfaced and                                           comment period are listed in the table
                                                  using ASTM C1303–08, ‘‘Standard Test                                    permeably faced foams. In the published                                   below and identified with reference
                                                  Method of Predicting Long Term                                          January NOPR, DOE cited a body of                                         numbers. DOE conducted further
                                                  Thermal Resistance of Closed-Cell Foam                                  research indicating that R-value decline                                  research and identified additional
                                                  Insulation,’’ to determine the long-term                                also occurs in foams with impermeable                                     documents that provide information on
                                                  R-value of foam insulations used in                                     facers because the metal skins delay, but                                 the use of ASTM C1303–10. These are
                                                  walk-ins. 75 FR 194. (That test method                                  do not prevent, R-value decline because                                   also listed in the table below with
                                                  has since been updated to ASTM                                          the panel edges are unprotected. DOE                                      reference numbers preceded by ‘‘DOE.’’

                                                                                                TABLE III.1—RESEARCH CITED BY INTERESTED PARTIES AND BY DOE
                                                                    Commenter                                                                                      Paper Citation                                                                   Ref. No.

                                                  ACC/CPI ..........................................       SPI Polyurethane Division k Factor Task Force, ‘‘Rigid Polyurethane and                                                                             1
                                                                                                             Polyisocyanurate Foams: An Assessment of Their Insulating Properties,’’ Proceedings
                                                                                                             of the SPI 31st Annual Technical/Marketing Conference, Oct. 18–21, 1988 Philadel­
                                                                                                             phia, PA. pp. 323–327.
                                                  ACC/CPI, Carpenter, Honeywell ......                     Wilkes, K. E., Yarbrough, D.W., Nelson, G. E., Booth, J. R., ‘‘Aging of Polyurethane                                                                2
                                                                                                             Foam Insulation in Simulated Refrigerator Panels—Four-Year Results with Third-Gen­
                                                                                                             eration Blowing Agents’’, The Earth Technologies Forum, Washington, DC, April 22–
                                                                                                             24, 2003.
                                                  ACC/CPI, Honeywell ........................              Norton, F.J., ‘‘Thermal Conductivity and Life of Polymer Foams’’, Journal of Cellular Plas­                                                         3
                                                                                                             tics, 1967, pp. 23–37.
                                                  ACC/CPI, Honeywell ........................              Shankland, I. R. ‘‘Blowing Agent Emissions from Insulation Foam’’, Polyurethanes World                                                              4
                                                                                                             Congress 1991 pp. 91–98.
                                                  Dow ..................................................   Oertel, Dr. Gunter, Polyurethane Handbook, p. 256 ............................................................                                      5
                                                  Dow ..................................................   Ottens et al., ‘‘Industrial Experiences with CO2 Blown .........................................................                                    6
                                                                                                           Polyurethane Foams in the Manufacture of Metal Faced Sandwich Panels,’’ Polyurethane
                                                                                                             World.
                                                                                                           Congress ’97’ ........................................................................................................................
                                                  Dow ..................................................   Bertucelli et al., ‘‘Phase-Out of Ozone Depleting Substances in the Manufacture of Metal                                                            7
                                                                                                             Faced Sandwich Panels with Polyurethane Foam Core,’’ Utech Asia ’99’.
                                                  Owens Corning ................................           The Role of Barriers in Reducing the Aging of Foam Panels by Leon R. Glicksman .........                                                         8
                                                  Dow ..................................................   European standard EN 13165 ..............................................................................................                        9
                                                  DOE .................................................    Wilkes, K. E., Yarbrough, D. W., Nelson, G. E., Booth, J. R., ‘‘Aging of Polyurethane                                                        DOE 1
                                                                                                             Foam Insulation in Simulated Refrigerator Panels—Four-Year Results with Third-Gen­
                                                                                                             eration Blowing Agents,’’ The Earth Technologies Forum Conference Proceedings,
                                                                                                             2003.
                                                  DOE .................................................    Paquet, A., Vo C., ‘‘An Evaluation of the Thermal Conductivity of Extruded Polystyrene                                                       DOE 2
                                                                                                             Foam Blown with HFC–134a and HCFC–142b,’’ Journal of Cellular Plastics, Volume
                                                                                                             40, May 2004.
                                                  DOE .................................................    Federal Trade Commission, ‘‘Labeling and Advertising of Home Insulation: Trade Regu­                                                         DOE 3
                                                                                                             lation Rule; Final Rule,16 CFR Part 460,’’ Federal Register/Vol. 70, No. 103/Tuesday,
                                                                                                             May 31, 2005.
                                                  DOE .................................................    Roe, Richard, ‘‘Long-Term Thermal Resistance (LTTR): 5 Years Later’’ RCI–057–Inter­                                                          DOE 4
                                                                                                             face, March 2007.
                                                  DOE .................................................    Stovall, Therese, ‘‘Measuring the Impact of Experimental Parameters upon the Estimated                                                       DOE 5
                                                                                                             Thermal Conductivity of Closed-Cell Foam Insulation Subjected to an Accelerated
                                                                                                             Aging Protocol: Two-Year Results, Journal of ASTM International, Vol. 6, No. 5 Paper
                                                                                                             ID JAI102025, April 2009.
                                                  DOE .................................................    Kalinger, P., and Drouin, M. (Johns Manville), ‘‘Closed Cell Foam Insulation: Resolving                                                      DOE 6
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                                                                                                             the issue of thermal performance,’’ October/November 2001.
                                                  DOE .................................................    Mukhopadhyaya, P., Bomberg, M. T., Kumaran, M. K., Drouin, M., Lackey, J., van                                                               DOE 7
                                                                                                             Reenen, D., and Normandin, N., ‘‘Long-Term Thermal Resistance of Polyisocyanurate
                                                                                                             Foam Insulation with Impermeable Facers ,’’ Insulation Materials: Testing and Applica­
                                                                                                             tions: 4th Volume, ASTM STP 1426, A. O. Desjarlais, Ed., American Society for Test­
                                                                                                             ing and Materials, West Conshohocken, PA, 2002.




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                                                  55076                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                                                    TABLE III.1—RESEARCH CITED BY INTERESTED PARTIES AND BY DOE—Continued
                                                                   Commenter                                                                       Paper Citation                                         Ref. No.

                                                  DOE .................................................   Mukhopadhyaya, P., Bomberg, M. T., Kumaran, M. K., Drouin, M., Lackey, J., van                      DOE 8
                                                                                                            Reenen, D., and Normandin, N., ‘‘Long-term Thermal Resistance of Polyisocyanurate
                                                                                                            Foam Insulation with Gas Barrier,’’ IX International Conference on Performance of Ex­
                                                                                                            terior Envelopes of Whole Buildings, Clearwater Beach, Florida, Dec. 5–10, 2004, pp.
                                                                                                            1–10.
                                                  DOE .................................................   Mukhopadhyaya, P.; Kumaran, M.K., ‘‘Long-Term Thermal Resistance of Closed-Cell                     DOE 9
                                                                                                            Foam Insulation: Research Update From Canada,’’ 3rd Global Insulation Conference
                                                                                                            and Exhibition, Oct. 16–17, 2008, Barcelona, Spain, pp. 1–12, NRCC–50839.
                                                  DOE .................................................   Bomberg, M., Branreth, D., ‘‘Evaluation of Long-Term Thermal Resistance of Gas-Filled              DOE 10
                                                                                                            Foams: State of the Art,’’ Insulation Materials, Testing and Applications, ASTM STP
                                                                                                            1030, ASTM, Philadelphia, 1990, p. 156–173.
                                                  DOE .................................................   H. Macchi-Tejeda, H. Opatova, D. Leducq, Contribution to the gas chromatographic anal­             DOE 11
                                                                                                            ysis for both refrigerants composition and cell gas in insulating foams—Part I: Method,
                                                                                                            International Journal of Refrigeration, Volume 30, Issue 2, March 2007, Pages 329–
                                                                                                            337.
                                                  DOE .................................................   H. Macchi-Tejeda, H. Opatova, J. Guilpart, Contribution to the gas chromatographic anal­           DOE 12
                                                                                                            ysis for both refrigerants composition and cell gas in insulating foams—Part II: Aging
                                                                                                            of insulating foams, International Journal of Refrigeration, Volume 30, Issue 2, March
                                                                                                            2007, Pages 338–344.



                                                     ACC/CPI, in reference to paper [1],                               With regard to papers cited by                     [thermal conductivity] of 19 percent to
                                                  stated that the Task Force found that                             interested parties, DOE makes the                     28 percent with aging at 90 °F, 12
                                                  polyurethane foam encased in and                                  following observations (the numbering                 percent to 23 percent at 40 °F, and 3
                                                  adhered to impermeable facers does not                            refers to the paper reference number in               percent to 8 percent at ¥10 °F. The
                                                  age significantly. (ACC/CPI, No. 1.3.006                          Table III.1).                                         panels with ABS sheets showed smaller
                                                  at p. 3) In reference to [2], Honeywell                              1. On p. 325 of paper [1], the SPI                 increases of 14 percent to 21 percent at
                                                  stated that Wilkes et al. concluded that                          Polyurethane Division k Factor Task                   90 °F, 10 percent to 17 percent at 40 °F,
                                                  ‘‘the increment of thermal conductivity                           Force states ‘‘* * * thermal                          and 2 percent to 5 percent at ¥10 °F.’’
                                                  of foams with facers is less than those                           performance changes little with time if               (p. 10). The results demonstrate that
                                                  of enclosed foams’’, and regarding that,                          the foam is protected against gas                     facers reduce the rate of aging. However,
                                                  ASTM C1303–08 is likely to                                        diffusion by a non-permeable facer that               the plastic facers used, with the
                                                  underestimate the aged thermal                                    adheres well to the foam.’’ However,                  exception of the foil around the edges,
                                                  insulation value of panel foams with                              immediately following this statement                  are gas permeable. In addition, Wilkes et
                                                  facers. (Honeywell, No. 1.3.020 at p. 3)                          SPI says, ‘‘The literature emphasizes that            al. specifically attempted to eliminate
                                                  Honeywell suggested that ‘‘DOE                                    not only the foam but the entire package              lateral diffusion with the foil tape on the
                                                  consider adapting the aging prediction                            or composite must resist gas diffusion.’’             edges of the samples, which is not
                                                  methodology presented’’ in either [3] or                          This statement supports DOE’s position                representative of actual walk-in panels.
                                                  [4]. (Honeywell, No. 1.3.020 at p. 2)                             that it is critical to ensure that all of the            3. Honeywell suggested that DOE
                                                  Dow stated that [5], [6], and [7]                                 foam is encapsulated by an                            adopt aging methodology presented by
                                                  indicated that change in thermal                                  impermeable barrier to prevent                        the Norton article [3], which was one of
                                                  conductivity due to aging is limited in                           diffusion of gases, not just the face of              the key citations for the development of
                                                  blown polyurethane foams. (Dow, No.                               the material. However, the study also                 ASTM C1303–10. Norton completed
                                                  1.3.026 at p. 2) In reference to [8],                             provides a number of studies that                     much of the original research in the
                                                  Owens Corning stated that the study                               suggest that aging is delayed on the                  field of foam insulation aging.
                                                  showed that blowing agent can diffuse                             order of three to nine years rather than              Therefore, DOE is proposing to adopt a
                                                  under metal skins, that it migrates to the                        two to three years as DOE previously                  test procedure, ASTM C1303–10, which
                                                  surface and that it can permeate out                              suggested.                                            already incorporates Honeywell’s
                                                  even underneath an air-impermeable                                   2. In paper [2], Wilkes et al. measured            suggested methodology.
                                                  surface. (Owens Corning, No. 1.2.010 at                           the LTTR of 2-inch-thick foam samples                    4. The Shankland paper [4] proposes
                                                  p. 256) Dow noted that [9] ‘‘provides                             faced with either Acrylonitrile                       an analytical approach to calculating
                                                  methods for evaluating the aged lambda                            Butadiene Styrene (ABS) or High Impact                lateral gas diffusion through foam
                                                  (λ) or R-values for both exposed foam                             Polystyrene (HIPS) plastic. The edges of              panels with open edges. A similar
                                                  and faced foam using an accelerated                               the samples were covered with                         methodology is proposed in [DOE 8]
                                                  procedure. The standard uses safety                               aluminum foil tape to reduce lateral                  and [DOE 9], but researchers have had
                                                  factors depending on thickness and                                diffusion through the panel edges. The                difficulty modeling and predicting
                                                  blowing agent used in the foam and also                           samples were aged for 4 years in 90 °F,               blowing agent diffusion coefficients.
                                                  uses incremental factors for exposed                              40 °F, and ¥10 °F environments. In                    [DOE 8] has found that direct analytical
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                                                  foams versus foams with facings.’’                                conclusion, Wilkes et al. found that for              approach is not possible, but numerical
                                                  However, Dow also noted that ‘‘even                               ‘‘both ABS and HIPS plastics, the                     computer simulation to predict lateral
                                                  though the standard and the procedure                             conductivity increases after four years               gas diffusion rates may be viable in a
                                                  apply to foams with and without                                   were less than those predicted for                    few years.
                                                  impermeable facings,’’ the aging factor is                        unenclosed full-thickness core-foam,                     5. The Oertel paper [5] describes
                                                  four times higher for exposed foam than                           showing that the plastic liners reduce                research conducted to predict the
                                                  it is for impermeably faced foam. (Dow,                           the rate of aging. The panels with HIPS               amount of blowing agent that permeates
                                                  No. 1.3.026 at p. 1)                                              sheets showed average increases of                    through building walls after being


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                           55077

                                                  released from the underlying foam                       decay exponentially with increased                    standard has provisions for accelerated
                                                  insulation. The researcher notes, ‘‘if the              distance (or thickness of foam) from the              aging of panels. This is one of the
                                                  rigid foam is faced with a diffusion                    exposed edge as described in ASTM                     material standards that uses the aging
                                                  barrier, the equilibration process cannot               C1303–10. The authors did not note the                factor described in [7]. DOE was
                                                  occur. The original composition of the                  aging period that their test, which was               previously unaware that the CEN had
                                                  cell gas remains unchanged and the low                  conducted over 6 months at an elevated                established aging factors for insulated
                                                  initial thermal conductivity is                         temperature, was intended to simulate,                panels and believes that this standard
                                                  maintained. This was proven when                        but because elevated temperature                      may serve as an alternative to ASTM
                                                  impermeable facing materials were                       dramatically increases gas diffusion                  C1303–10 (see section III.B.3 for more
                                                  used. Only metallic surfaces are                        rates, the tests are likely representative            details).
                                                  impermeable.’’ This section does not cite               of panels aged for at least 5 years.                     In addition to comments on specific
                                                  research confirming this claim, but as                      7. The Bertucelli paper [7], other than           papers submitted by stakeholders, DOE
                                                  previously mentioned, DOE agrees that                   [5], is the only one that DOE has                     received many general comments on the
                                                  metal facers, particularly ones used in                 reviewed that directly tests aging of                 use of ASTM C1303. DOE addresses
                                                  WICF panels, are gas impermeable.                       actual walk-in panels. Bertucelli et al.              these additional comments below.
                                                  However, because the metal skins used                   state that, ‘‘in practice, for metal faced               BASF stated that there was
                                                  in WICF panels do not fully encapsulate                 sandwich panels the diffusion                         insufficient evidence to support DOE’s
                                                  the foam in a contiguous manner (i.e.,                  phenomena can only take place through                 assertion that the diffusion as a result of
                                                  metal skin on the panel face and all                    the open sides of the panels. The initial             delamination, holes drilled for shelves,
                                                  edges), gas diffusion may still occur                   thermal conductivity value remains for                and gaps at windows and doors causes
                                                  laterally through the panel edges.                      a long time practically unchanged for                 a dramatic decrease in insulation
                                                                                                          the largest part of the panel due to the              performance of the panel, and that DOE
                                                     6. DOE notes that the Ottens study [6]                                                                     should publish and make available any
                                                                                                          long path for diffusion.’’ (p. 2) Again,
                                                  is one of two of which DOE is aware that                                                                      supporting data. (BASF, No. 1.3.003 at
                                                                                                          this research supports DOE’s claim that
                                                  has been completed on polyurethane                                                                            p. 3–4) Honeywell stated that ASTM
                                                                                                          significant lateral diffusion occurs
                                                  foam-in-place panels, with open edges                                                                         C1303 was inappropriate because the
                                                                                                          through open edges of panels. This
                                                  intended to simulate metal skinned                                                                            data used to select it were based on foil-
                                                                                                          statement appears to be based on data
                                                  walk-in panels. This paper summarizes                                                                         faced board stock rather than metal-
                                                                                                          shown on page 17 that are very similar
                                                  studies completed by IMA                                                                                      faced panels. (Honeywell, No. 1.3.002 at
                                                                                                          to data shown in [6] for CO2 blown
                                                  (Materialforschungs- und                                foams. However, this test was on a 4                  p. 1) BASF proposes to delay a decision
                                                  Anwendungstechnik Dresden GmbH,                         foot by 8 foot panel aged at room                     on modifying ASTM C1303 to apply to
                                                  translation: Materials and Applications                 temperature for a year. Close to the                  impermeably skinned panels due to a
                                                  Research) as requested by                               geometric center of the panel, the                    lack of data, and instead proposes that
                                                  Arbeitsgemeinschaft Industrieller                       thermal performance has aged by 2 to 5                DOE first test and compare (1) panels
                                                  Forschung (translation: Association of                  percent from its initial value.                       from the field that are at a known age
                                                  Industrial Research) to assess the long-                Measurements approximately 20 inches                  that is greater than 5 years, (2) newly
                                                  term insulating behavior of sandwich                    from the edges range from 2 to 6                      manufactured panels measuring the R-
                                                  elements. In particular, this paper cites               percent. These data are similar to data               value at different points in the panels,
                                                  data on carbon dioxide (CO2) blown                      submitted by Carpenter (see Table III.2)              and (3) newly manufactured panels that
                                                  foams as an alternative to other blowing                which were also from a panel aged at                  are sliced and aged according to the
                                                  agents. On page 30 of the study, Figures                room temperature but with an HFC                      methods in ASTM C1303–10. (BASF,
                                                  4 and 5 show aging results for both core                blowing agent. The Bertucelli paper also              No. 1.3.003 at p. 4)
                                                  and edge regions of test panels. The                    notes that EN 13165, a European                          Carpenter submitted data, shown in
                                                  areas greater than approximately 12                     material standard that was developed in               Table III.2, of panels that had been in
                                                  inches from the edge exhibit 2 to 3                     Germany but certified by the European                 the field for one year. These data suggest
                                                  percent aging after 6 months at a                       Committee for Standardization (CEN),                  that R-value decreases approximately
                                                  temperature of approximately 160 °F.                    provides certified aging values for                   3.1 to 4.3 percent within 1 year.
                                                  Regions within 12 inches of the edge                    various blowing agents used in metal                  (Carpenter, No. 1.3.007a at p. 3) Dow
                                                  show 5 to 17 percent aging, with the                    faced sandwiched foam-in-place panels.                stated that ASTM C1303–10 states that
                                                  highest rate of aging occurring at the                  The researchers also note that the                    it is not to be used with impermeably
                                                  panel corners. Dow noted in its                         certified aging value for water-blown                 faced foams, and that industry literature
                                                  reference to this paper that CO2 ‘‘has                  foams, HCFC–141b and pentane is 10                    states that metallic, impermeable
                                                  higher diffusion speeds, [therefore] the                percent.                                              surfaces will prevent blowing agent
                                                  aged thermal conductivity would be                          8. The Glicksman paper [8] found that             diffusion. (Dow, No. 1.3.026 at p. 1)
                                                  even better for the HFC blown foams                     the effectiveness of impermeable facers               Owens Corning submits that research
                                                  used in many walk-in applications.’’                    is highly dependent on adhesion of the                has shown that an effective barrier can
                                                  DOE agrees with Dow that CO2 exhibits                   foam to the facer. Slight separation                  substantially reduce the rate of foam
                                                  a faster rate of diffusion than                         allows gas diffusion to occur                         aging. In its view, to be effective, the
                                                  hydrofluorocarbon (HFC) blowing                         perpendicularly to the barrier and                    barrier must have a low permeability
                                                  agents typically used in foams, which                   laterally between the barrier and the                 and the foam/barrier interface must not
                                                  indicates that the study is likely more                 foam, which permits more rapid aging                  allow lateral gas flow. However, all
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                                                  representative of a worst case aging                    than if the diffusion is forced through               cellular foams have some amount of
                                                  scenario. This study clearly                            the foam material only in the lateral                 lateral gas flow. (Owens Corning, No.
                                                  demonstrates that lateral gas diffusion                 direction. This research supports DOE’s               1.3.030 at p. 1) In addition, Owens
                                                  occurs in metal faced panels with open                  assertion that delamination is a major                Corning referenced a Massachusetts
                                                  edges. DOE also notes that the majority                 contributing factor to aging of panels.               Institute of Technology study on
                                                  of aging has occurred at the panel                          9. EN 13165 is a material standard for            insulation with metal skins using dye to
                                                  perimeter, which is an expected result                  ‘‘factory made rigid polyurethane foam                observe the diffusion of blowing agent.
                                                  because the rate of diffusion should                    (PUR) products.’’ Dow noted that this                 The study showed that blowing agent


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                                                  55078                       Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  can diffuse under metal skins, that it                                  impermeable surface. (Owens Corning, 

                                                  migrates to the surface, and that it can                                No. 1.2.010 at p. 256) 

                                                  permeate out even underneath an air-


                                                                                                             TABLE III.2—TESTED DATA SUBMITTED BY CARPENTER
                                                                                                                                                                                                R-value
                                                                                                                                                                                            ft2 hr° F/Btu in

                                                                                           Sample ID                                                                       20° F                                               55° F

                                                                                                                                                            11/2008                  01/2010                    11/2008                 01/2010
                                                                                                                                                             (initial)                (aged)                     (initial)               (aged)

                                                  Panel middle ....................................................................................                      7.89                   7.63                         7.00                 6.78
                                                  Panel edge .......................................................................................                     7.89                   7.54                         7.00                 6.70



                                                    In response to BASF’s comment that                                    C1303–10 states that the test does not                           thermal conductivity can increase in
                                                  DOE should publish and make available                                   apply to impermeably faced foams, DOE                            plastic foams in which gaseous blowing
                                                  any supporting data for the use of                                      has not proposed the use of ASTM                                 agent has been used * * * with such
                                                  ASTM C1303–10, DOE lists all papers in                                  C1303–10 on panels themselves.                                   materials, there will inevitably be a
                                                  Table III.1. Most of these papers were                                  Instead, DOE has proposed that the                               deterioration of insulation properties
                                                  already described in detail in January                                  procedure be followed when testing the                           over time due to the diffusion of the
                                                  NOPR, but DOE welcomes further                                          underlying unfaced foam as a proxy for                           blowing agent.’’ (Insulation and
                                                  comment on these studies.                                               the actual aging provisions outlined in                          Airtightness of Cold Rooms, 2002
                                                    In response to Honeywell’s comment                                    the NOPR that describe how the unfaced                           Edition, IIR, p.154) Because walk-in
                                                  regarding foil facers, DOE recognizes                                   foam samples are prepared for testing by                         panel perimeters are not protected by
                                                  that foil faced foams may not have                                      ASTM C1303–10. See section 4.1.2 of                              gas impermeable materials such as the
                                                  identical characteristics to metal skins,                               Appendix A for details.                                          metal skins, gas diffusion can still occur
                                                  but believes that foils would serve as a                                   With regard to Owens Corning’s                                laterally through the panel. DOE notes
                                                  reasonable proxy for general aging                                      comments that an effective barrier can                           that Owens Corning’s second comment
                                                  behavior.                                                               substantially reduce the rate of foam                            regarding the Massachusetts Institute of
                                                    With regard to BASF’s comment that                                    aging, DOE agrees that impermeable
                                                                                                                                                                                           Technology study on diffusion of
                                                  DOE should collect field data on panels                                 facers affect the diffusion pathway of
                                                                                                                                                                                           blowing agents points to data that
                                                  older than 5 years of age, DOE believes                                 gases through foam. However, DOE
                                                                                                                                                                                           suggest the lateral flow of gas occurs at
                                                  that the data submitted by Carpenter                                    believes that impermeable facers delay
                                                                                                                                                                                           the foam surface to metal skin interface
                                                  support DOE’s assertion that significant                                aging, rather than eliminate it as Dow
                                                                                                                          and ACC/CPI suggest. In addition, the                            due to poor adhesion of the foam to
                                                  aging occurs over the 15 to 20 year life
                                                                                                                          International Institute of Refrigeration                         metal.
                                                  of a panel and that the diffusion is
                                                  occurring laterally because aging of 3–                                 (IIR), which serves as an international                             In addition to the data presented
                                                  4 percent occurred within about 1 year,                                 body with 61 member countries to                                 above, DOE presents aged R-values of a
                                                  with the edge samples aging more than                                   ‘‘promote knowledge of refrigeration                             number of foam types in Table III.3.
                                                  the core. DOE welcomes additional data                                  technology and all its applications in                           These results are based on CAN/ULC S–
                                                  on this issue from panel manufacturers                                  order to address today’s major issues,                           770, the Canadian thin slicing method
                                                  and other interested parties.                                           including food safety and protection of                          that is based on various versions of
                                                    As to Dow’s comments regarding the                                    the environment,’’ states that the                               ASTM C1303. Each data point is an
                                                  scope of ASTM C1303–10, although                                        thermal properties of insulation can                             average of dozens of tests at the
                                                  DOE agrees with Dow that ASTM                                           change over time: ‘‘It is well known that                        thicknesses shown.

                                                                                   TABLE III.3—FOAM THIN-SLICING TEST RESULTS, SOURCE: CANADIAN LABORATORY
                                                                                                                       5-Year Long Term Thermal Resistance, CAN/ULC S–770, @ 75° F mean temperature

                                                                                                                                                                                                                         Spray-in-Place
                                                                     Product                            Permeably Faced Polyisocyanurate                         Extruded Polystyrene Board                            Polyurethane Foam
                                                                                                            Board Thermal Resistivity                                Thermal Resistivity                               Thermal Resistivity
                                                                                                                 °F-ft 2-h/Btu-in.                                     °F-ft 2-h/Btu-in.                                 °F-ft 2-h/Btu-in.

                                                                   Thickness                                        Thermal Resistivity                                  Thermal Resistivity                           Thermal Resistivity

                                                                       (mm)                                            (°F.ft2.h/Btu.in )                                  (°F.ft2.h/Btu.in )                            (°F.ft2.h/Btu.in )

                                                                        100                                                   6.178                                             5.607                                           6.197
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                                                                         75                                                   6.127                                             5.490                                           5.958

                                                                         50                                                   6.028                                             5.339                                           5.703

                                                                         25                                                   5.880                                             5.019




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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                         55079

                                                     These data address concerns raised by                above factors tend to support the use of                DOE requests comments from
                                                  various interested parties that the thin                a test procedure that, as accurately as               interested parties regarding the proposal
                                                  slicing method would unfairly predict                   possible, will uniformly represent aging              to use ASTM C1303–10 to measure the
                                                  that polyurethane would perform at a                    of all foam classes.                                  long-term R-value decline in WICF foam
                                                  lower level than extruded polystyrene                      In light of the research and data                  insulation. DOE requests that interested
                                                  and, in some cases, would perform at a                                                                        parties consider in their comments the
                                                                                                          submitted by interested parties, and the
                                                  level as low as expanded polystyrene.                                                                         research and papers provided by DOE
                                                                                                          German data regarding the use of aging
                                                  Instead, these data appear to predict that                                                                    and other commenters.
                                                                                                          factors specifically for foam-in-place
                                                  polyurethane products would continue
                                                                                                          metal faced panels, DOE continues to                  3. EN 13165:2009–02 as a Proposed
                                                  to outperform extruded polystyrene on
                                                                                                          maintain that (1) foam aging occurs in                Alternative to ASTM C1303–10
                                                  a per inch basis. It is also important to
                                                  note that if DOE were not to propose the                WICF panels, (2) the aging is possible,                  As noted in the previous section,
                                                  use ASTM C1303–10, DOE would still                      even with metal facers, due to the gas                Germany has developed a test procedure
                                                  be indirectly accounting for aging in one               permeable edges of panels, and (3) R-                 (that was certified as a European
                                                  of two classes of foams: Board stock                    value degradation is significant enough,              standard by the CEN) and calculation
                                                  foams such as extruded polystyrene.                     over the life of a walk-in cooler or                  methodology to determine the aged R-
                                                  Because board-stock insulation is                       freezer, to warrant a long-term foam                  value of metal skin panels. EN
                                                  manufactured at one location, stored for                aging test. DOE continues to urge                     13165:2009–02, Thermal insulation
                                                  a period of time, and then shipped to                   manufacturers and interested parties to               products for buildings—Factory made
                                                  WICF panel manufacturers, the foam is                   submit R-value data for panels aged 5 or              rigid polyurethane foam (PUR)
                                                  exposed to ambient temperatures and                     more years to support their particular                products—Specification describes two
                                                  unprotected by metal skins for a                        claims. While DOE believes there are                  alternatives in Annex C, the fixed
                                                  significant period of time prior to its                 enough indirect and direct data to                    increment procedure and the
                                                  installation in a WICF envelope.                        incorporate aging into the WICF test                  accelerated aging procedure for
                                                  Therefore, before board stock based                     procedure, DOE is interested in                       determining aged R-value. An overview
                                                  foams are even laminated into WICF                      ensuring, to the extent possible, that it             of the two alternatives is shown in
                                                  panels, significant aging has already                   incorporates manufacturer-submitted                   Figure 1 below:
                                                  occurred. DOE believes that all of the                  data as part of its analysis.                         BILLING CODE 6450–01–P
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                                                  55080               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules




                                                  BILLING CODE 6450–01–C                                  determining whether there is any                      procedure must be used to determine
                                                     The alternative procedures—the fixed                 decrease in the R-value. If the panel is              the LTTR. The accelerated aging
                                                  increment procedure and the                             found to be gas tight and the test                    procedure subjects the panel to an
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                                                  accelerated aging procedure—are                         material is also made with blowing                    elevated temperature for 180 days and
                                                  selected based on certain criteria and
                                                                                                          agents of known characteristics, then                 determines the decrease in the R-value.
                                                  availability of historical data as defined
                                                                                                          the LTTR of the foam is determined                      Like EN 13165:2009–02, which is a
                                                  in EN 13165:2009–02. In summary, the
                                                                                                          using assumed increments of R-value                   standard for polyurethane products, a
                                                  fixed increment procedure determines if
                                                  a facing or panel construction is ‘‘gas                 loss. The assumed aging values have                   similar standard exists for extruded
                                                  diffusion tight’’ by subjecting it to an                been certified by Germany through                     polystyrene: EN 13164:2009–02
                                                                                                          testing. Otherwise, the accelerated aging             Thermal insulation products for
                                                                                                                                                                                                          EP09SE10.030</GPH>




                                                  elevated temperature for 60 days and


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                          55081

                                                  buildings—Factory made products of                      onto a single sheet of wood in                        3. Sample Preparation
                                                  extruded polystyrene foam (XPS)—                        accordance with section A2.3 of ASTM                     a. After the foam has cured and the
                                                  Specification. Annex C of EN                            C1303–08, the sample ‘‘shall be foamed                panel is ready to be tested, the facing
                                                  13164:2009–02 also provides a                           into a fully closed box of internal                   and framing materials must be carefully
                                                  methodology for determining the LTTR                    dimension 60 cm × 60 cm by desired                    removed to ensure that the underlying
                                                  of impermeably faced or ‘‘gas tight’’                   product thickness (2 ft × 2 ft × desired              foam is not damaged or altered.
                                                  products. DOE proposes, as an                           thickness). The box shall be made of 3⁄4                 b. A 12-inch × 12-inch square (×
                                                  alternative to ASTM C1303–10, the use                   inch plywood and internal surfaces are                desired thickness) cut from the exact
                                                  of the test procedures of these respective              wrapped in 4 to 6 mil polyethylene film               geometric center of the panel must be
                                                  standards for determining the LTTR of                   to prevent the foam from adhering to the              used as the sample for completing
                                                  walk-in polyurethane and extruded                       box material.’’ DOE had intended for                  ASTM C1303–08.
                                                  polystyrene products. DOE proposes to                   this proposed approach to minimize                       These additions will allow for more
                                                  directly rely on the methods described                  manufacturer burden while ensuring                    representative samples while
                                                  in EN 13164:2009–02 and EN                              uniform sample preparation.                           maintaining consistency across
                                                  13165:2009–02 with two exceptions: (1)                                                                        manufacturers. DOE also believes, based
                                                  The initial R-value must be measured at                    In reference to this proposal,
                                                                                                          Honeywell stated that the sample                      on its analysis of the likely impacts from
                                                  the EPCA defined mean test                                                                                    the adoption of this procedure, that
                                                  temperatures (instead of the specified                  preparation method is too prescriptive
                                                                                                          for foam-in-place products and argued                 these proposed modifications will not
                                                  ~75 °F) of 55 °F for coolers and 20 °F
                                                                                                          that DOE should not dictate materials                 lead to any appreciable deviations from
                                                  for freezers and (2) the final R-value
                                                                                                          for building the sample mold or                       the measured energy use of the
                                                  must also be measured using the EPCA
                                                                                                          dimensions of the mold. Rather, it                    envelope. DOE invites comments from
                                                  defined mean test temperatures. Using
                                                                                                          recommended that foam-in-place                        interested parties on the reasonableness
                                                  the initial and final R-values, a
                                                                                                          samples be prepared in a fashion that                 of this prediction.
                                                  calculated foam ‘‘derating’’ factor would
                                                                                                          represents the average foam properties                   Certain interested parties raised
                                                  be used in place of the similar
                                                                                                          (or bulk foam properties) of the                      specific concerns as to the applicability
                                                  calculation using results from ASTM
                                                                                                          commercial panel. (Honeywell, No.                     of ASTM C1303 to ‘‘bun stock’’ foam.
                                                  C1303–10. DOE seeks comment on the
                                                                                                          1.3.020 at p. 3) ACC/CPI stated that the              ‘‘Bun stock’’ foam is foam formed in
                                                  use of EN 13164:2009–02 and EN
                                                                                                          sample preparation methods of                         large cylindrical tubes or ‘‘buns.’’
                                                  13165:2009–02 for determining the
                                                                                                          polyurethane foam are too prescriptive                Dyplast, ACC/CPI, Honeywell, and ITW
                                                  LTTR of walk-in panels made from
                                                                                                          when describing mold materials that                   all stated that DOE should not consider
                                                  extruded polystyrene or polyurethane,
                                                                                                          must be used, and instead                             ASTM C1303 because ASTM C1303
                                                  respectively.
                                                     DOE also seeks comment on the                        recommended adopting a modified                       specifically states that the test method
                                                  proposed use of CEN’s certified aged                                                                          does not apply to rigid closed-cell bun
                                                                                                          version of section 3.1 of ASTM C1303–
                                                  values as an alternative to requiring                                                                         stock foams. (Dyplast, No. 1.3.008 at p.
                                                                                                          10 to account for a product
                                                  testing using ASTM C1303–10.                                                                                  1; ACC/CPI, No. 1.3.006 at p. 3;
                                                                                                          manufacturer’s typical method of panel
                                                                                                                                                                Honeywell, No. 1.3.020 at p. 2; and
                                                  4. Version of ASTM C1303                                cavity preparation, foam injection and
                                                                                                                                                                ITW, No. 1.3.013 at p. 1) Dyplast
                                                                                                          cure time. (ACC/CPI, No. 1.3.006 at p.
                                                     As indicated earlier, DOE initially                                                                        mentioned that this was due to the non-
                                                                                                          5)
                                                  proposed that the test procedure                                                                              homogenous nature of the bun stock
                                                  incorporate ASTM C1303–08. 75 FR                           DOE agrees that spatial variation                  foams. (Dyplast, No. 1.3.008 at p. 1) ITW
                                                  194. Nor-Lake pointed out that a more                   during foam injection is a relevant                   further stated that ASTM C1303 would
                                                  recent version of this testing method                   concern. To represent foam properties                 not be applicable because it is not
                                                  was published in 2009, ASTM C1303–                      more closely for various manufacturers,               possible to determine a consistent initial
                                                  09a. (Nor-Lake, No. 1.3.005 at p. 3) DOE                DOE proposes the following changes:                   time for the test and because sheets may
                                                  then determined that an even more                       1. Mold/Sample Panel Geometry                         be cut from bun stock in different
                                                  recent version has recently been                                                                              orientations, resulting in different form
                                                  published, ASTM C1303–10. To address                      a. A panel must be prepared following               morphology. (ITW, No. 1.3.013 at p. 1)
                                                  these comments, DOE compared ASTM                       the manufacturer’s injection, curing and                 DOE recognizes that bun stock foam is
                                                  C1303–08, ASTM C1303–09a and                            assembly methods. The width and                       different from other types of foam used
                                                  ASTM C1303–10 and found no                              length of the panel must be 48 inches                 in WICF equipment. The foam
                                                  substantive differences between them                    ±1 inch and 96 inches ±1 inch,                        resembles the wood grain found in trees
                                                  that would appreciably affect the                       respectively.                                         and has cells that vary in size and
                                                  accuracy or manner in which to                                                                                density by location. When the buns are
                                                                                                            b. As proposed in the January NOPR,                 cut into board stock of various
                                                  measure a given foam’s R-value. In light                the panel thickness shall be equal to the
                                                  of this finding, DOE is revising its                                                                          dimensions, the foam morphology
                                                                                                          desired test thickness. 75 FR 194.                    varies from one board to another as the
                                                  proposal to adopt the most recent
                                                  version, ASTM C1303–10.                                 2. Materials                                          boards may be cut from the bun stock
                                                     DOE invites comment on this                                                                                in different orientations.
                                                  proposed approach.                                         The panel should be identical to                      DOE specified in the January NOPR
                                                                                                          panels sold by the manufacturer, with                 that manufacturers must use the
                                                  5. Improvements to ASTM C1303
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                                                                                                          one key exception: The inner surfaces                 prescriptive method defined in ASTM
                                                  Methodology                                             must be lined with a material, such as                C1303 (Part A: The Prescriptive
                                                     In the January NOPR, DOE proposed                    4 to 6 mil polyethylene film, to prevent              Method), but as noted by interested
                                                  several exceptions to ASTM C1303–08                     the foam from adhering to the panel                   parties, the prescriptive method is not
                                                  related to sample preparation of foam-                  internal surfaces. (This ensures that                 applicable to bun stock foam. 75 FR 193.
                                                  in-place products. 75 FR 194.                           when the panel metal skin is removed                  However, in addition to Part A of ASTM
                                                  Specifically, DOE proposed that, rather                 for testing, the underlying foam is not               C1303, Part B: Research Method allows
                                                  than requiring that foam be sprayed                     damaged.)                                             for testing of bun-stock or other non-


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                                                  55082                 Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  homogenous foams. DOE believes that                       the research method of ASTM C1303–                         calculate the heat transfer through the
                                                  the research method in Part B is                          10, Part B be used for testing the LTTR                    floor of both insulated and uninsulated
                                                  appropriate and applicable for testing of                 for bun stock foam only.                                   WICF. 75 FR 213. That equation, along
                                                  bun-stock foams. Therefore, to address                    6. Heat Transfer Through Concrete                          with its defined variables, is as follows:
                                                  the comments from Dyplast, ACC/CPI,
                                                  Honeywell, and ITW, DOE proposes that                        In the January NOPR, DOE proposed
                                                                                                            the use of the following equation to


                                                                         i ⎛           Awalls,i       ⎞ j ⎛             Afloor , j      ⎞ k ⎛             Aceiling,k          ⎞ l ⎛         Anon glass doors,l ⎞
                                                      Qcond-door-glass = ∑ ⎜ ΔTi ×                    ⎟ + ∑ ⎜ ΔTj ×                     ⎟ + ∑ ⎜ ΔTk ×                         ⎟ + ∑ ⎜ ΔTl ×                     ⎟      Eq. 1
                                                                           ⎜       R non glass wall,i ⎠ l ⎜
                                                                                                      ⎟             R non glass floor,j ⎟ l ⎜         R non glass ceiling,k   ⎟     ⎜       R non glass doors,l ⎟
                                                                         l ⎝                                ⎝                           ⎠     ⎝                               ⎠ l ⎝                             ⎠


                                                  Where:                                                    assumed that the finished subfloor                         ThermalRite, and American Panel
                                                  Rnon-glass,wall, i = R-value of foam used in wall         surface material was made of concrete.                     supported using an assumption of R–28,
                                                       panels, of type i, h-ft2 ¥ °F/Btu,                   Additionally, DOE proposed a 55 °F                         while Nor-Lake stated that a value of R–
                                                     Rnon-glass,floor, j = R-value of foam used in          subfloor surface temperature for all                       20 would be more appropriate but did
                                                  floor panels, of type j, h-ft2 ¥ °F/Btu,                  walk-ins. The temperature difference
                                                     Rnon-glass,ceil, k = R-value of foam used in
                                                                                                                                                                       not specify why. (BASF, No. 1.3.003 at
                                                  ceiling panels, of type k, h-ft2 ¥ °F/Btu,                across the floor (ΔT) could be calculated                  p. 4; ThermalRite, No. 1.3.031 at p. 2;
                                                     Rnon-glass,door, l = R-value of foam used in           using the 55 °F subfloor surface                           American Panel, Public Meeting
                                                  non-glass doors, of type l, h-ft2 ¥ °F/Btu,               temperature and the internal cooled air                    Transcript, No. 1.2.010 at p. 263; Nor-
                                                     Awalls,I = area of wall, of thickness and              assumption. With a known floor area                        Lake, No. 1.3.029 at p. 4) DOE, however,
                                                  underlying materials of type i,                           (Afloor), DT, and floor R-value, the heat                  continues to hold the view that its
                                                     Afloor,j = area of floor, of thickness and             transfer through the floor could be                        proposed approach best reflects the
                                                  underlying materials of type j,                           readily calculated. However, the
                                                     Aceiling,k = area of ceiling, of thickness and                                                                    statutory framework set out by Congress
                                                  underlying materials of type k,
                                                                                                            specific floor R-value was incorporated                    because R–28 is the minimum freezer
                                                     Anon-glass door,l = area of doors, of thickness        into the calculation based on certain                      floor R-value required by EISA 2007.
                                                  and underlying materials of type l,                       conditions. These conditions are                           See 42 U.S.C. 6313(f)(1)(D).
                                                     ΔTi = dry bulb temperature differential                described in greater detail below.
                                                  between internal and external air, of type i,                                                                           Insulated Floor Shipped by
                                                                                                               Floorless Coolers: For the scenario of
                                                  °F,                                                                                                                  Manufacturer: For both coolers and
                                                                                                            uninsulated (‘‘floorless’’) coolers, DOE
                                                  ΔTj = dry bulb temperature differential                   proposed a concrete R-value of 0.6 ft2 ¥                   freezers, if a manufacturer provided the
                                                       between internal and external air, of type
                                                                                                            °F ¥ h/Btu, based on typical concrete                      floor, DOE proposed in the January
                                                       j, °F,                                                                                                          NOPR that the floor R-value (as
                                                  ΔTk = dry bulb temperature differential                   density and thickness as reported in the
                                                                                                            2009 ASHRAE Fundamentals                                   measured by the test procedure) be used
                                                       between internal and external air, of type                                                                      for the heat transfer calculations. 75 FR
                                                       k, °F, and                                           Handbook.
                                                  ΔTl = dry bulb temperature differential                      Pre-Installed Freezer Floor: For the                    198.
                                                       between internal and external air, of type           scenario where (1) a manufacturer does                        Between the publication of the
                                                       l, °F.                                               not provide a freezer floor; and (2) an                    January NOPR and the public meeting,
                                                    To complete the calculation, DOE                        insulated floor has been installed on-site                 DOE completed additional finite
                                                  proposed temperature assumptions for                      by the end-user, DOE proposed that                         element model (FEM) computer
                                                  the internal cooled air and the surface                   manufacturers use R = 28 ft2 ¥ °F ¥ h/                     simulations of floorless coolers. Based
                                                  temperature of the floor. The cooled air                  Btu for completing the heat transfer                       on FEM simulation results, DOE
                                                  temperature was selected based on                         calculations. This R-value is the same as                  described a new equation during the
                                                  WICF type: 35 °F and ¥10 °F for coolers                   the EPCA-prescribed minimum                                public meeting for calculating heat
                                                  and freezers, respectively. DOE also                      requirement for freezer floors. BASF,                      transfer through floorless coolers:


                                                                           i ⎛           Awalls,i       ⎞                     k ⎛           Aceiling,k               ⎞ l ⎛         Anon glass doors,l ⎞
                                                         Qcond non-glass = ∑ ⎜ ΔTi ×                    ⎟ + qfloor × Afloor + ∑ ⎜ ΔTk ×                              ⎟ + ∑ ⎜ ΔTl ×                     ⎟            Eq. 2
                                                                             ⎜                          ⎟
                                                                                     R non glass wall,i ⎠                       ⎜       R non glass ceiling,k        ⎟     ⎜       R non glass doors,l ⎟
                                                                           l ⎝                                                l ⎝                                    ⎠ l ⎝                             ⎠

                                                                                                                                                                                                                               EP09SE10.035</MATH><!--MATH SPAN=’’ DEEP=’’-->

                                                  Where:                                                    Anon-glass door,l = area of doors of thickness and           The FEM simulations demonstrated
                                                  If Afloor ≤ 750 ft2, qfloor = 33.153 × Afloor¥0.364,           underlying materials of type l,                       that using 60 °F and 65 °F would result
                                                  If Afloor > 750 ft2, qfloor = 0.0002 × Afloor +           Afloor = area of floor, ft2,                               in more accurate energy calculations.
                                                        2.84,                                               DTi = dry bulb temperature differential                    DOE indicated at the NOPR public
                                                  qfloor = heat flow correction factor,                          between internal and external air, of type            meeting that it was considering
                                                  Rnon-glass,wall, i = R-value of foam used in wall              i, °F,
                                                        panels of type i, h ¥ ft2 ¥ °F/Btu,                                                                            modifying the surface temperature
                                                                                                            DTj = dry bulb temperature differential                    assumptions for freezers and coolers to
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                                                  Rnon-glass,floor, j = R-value of foam used in floor            between internal and external air, of type
                                                        panels of type j, h ¥ ft2 ¥°F/Btu,                                                                             60 °F and 65 °F, respectively, and
                                                                                                                 j, °F,
                                                                                                                                                                                                                               EP09SE10.034</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                  Rnon-glass,ceil, k = R-value of foam used in                                                                         sought comment from interested parties
                                                        ceiling panels of type k, h ¥ ft2 ¥ °F/             DTk = dry bulb temperature differential
                                                                                                                                                                       on these revised temperatures.
                                                        Btu,                                                     between internal and external air, of type
                                                  Rnon-glass,door, l = R-value of foam used in non-              k, °F, and                                              Several manufacturers recommended
                                                        glass doors of type l, h ¥ ft2 ¥ °F/Btu,            DTl = dry bulb temperature differential                    that DOE maintain the original
                                                  Aceiling,k = area of ceiling of thickness and                  between internal and external air, of type            assumption of 55 °F for sub-floor surface
                                                        underlying materials of type k,                          l, °F.                                                temperature. ThermalRite requested that


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                          55083

                                                  55 °F be retained because it believed                   However, DOE will continue to consider                either case, DOE proposed using the
                                                  that the equations were based on solid                  other values if they are more                         thermal performance parameters as
                                                  engineering principles and data.                        appropriate for the application and asks              inputs for calculations specified in the
                                                  (ThermalRite, No. 1.3.031 at p. 2) Nor-                 for comment on a more appropriate                     Test Procedure NOPR.
                                                  Lake agreed that 55 °F would be more                    value.                                                   DOE’s proposed method was
                                                  appropriate. (Nor-Lake, No. 1.3.029 at p.                                                                     supported by BASF, Master-Bilt, and
                                                                                                          7. Walk-In Sited Within a Walk-In: A
                                                  4) Kysor and TAFCO preferred 55 °F                                                                            Nor-Lake. (BASF, No. 1.3.003 at p. 4;
                                                                                                          ‘‘Hybrid’’ Walk-In                                    Master-Bilt, No. 1.3.009 at p. 2; Nor-
                                                  because it would be consistent with
                                                  industry assumptions. (Kysor, Public                       In the January NOPR, the calculation               Lake, No. 1.3.005 at p. 4) Kason agreed
                                                  Meeting Transcript, No. 1.2.010 at p.                   procedure provided a means of rating all              that using third-party software (such as
                                                  270 and TAFCO, No. 1.3.022 at p. 3) ICS                 walk-ins, including the scenario where                Window 5.2) to evaluate window
                                                  recommended that 55 °F be maintained                    a freezer is sited inside a cooler or                 performance is reasonable. (Kason, No.
                                                  as the assumption for both coolers and                  where a cooler and freezer share a                    1.3.037 at p. 4) However, NFRC
                                                  freezers because a walk-in with an                      common wall.                                          recommended using a standard size
                                                  insulated floor would not have an effect                   Modifications described in this                    door for all calculations to ensure a full
                                                  on sub-floor temperature regardless of                  SNOPR ensure that the rating of these                 rating that includes frame effects and
                                                  WICF temperature. (ICS, No. 1.3.027 at                  walk-in cooler/freezer hybrids is                     allow for accurate reporting. (NFRC,
                                                  p. 2) In light of this general support and              properly captured. For example, every                 Public Meeting Transcript, No. 1.2.010
                                                  the absence of any comments explaining                  panel or door may have a unique                       at p. 280) Furthermore, Schott Gemtron
                                                  why use of a 55 °F temperature                          temperature differential across the                   pointed out that the standard glass door
                                                  assumption would be inappropriate,                      material to reflect either a panel that               in Window 5.2 is not the same as a
                                                  DOE proposes continuing to apply its 55                 divides a cooler and freezer or a door                typical glass door used in walk-ins.
                                                  °F assumption for all WICF for three                    that may open from freezer temperatures               (Schott Gemtron, Public Meeting
                                                  reasons: (1) 55 °F is the general industry              to cooler temperatures. See section 3.1               Transcript, No. 1.2.010 at p. 284) ACEEE
                                                  accepted value; (2) using a single                      of Appendix A for details. In the event               stated that the manufacturers of doors
                                                  assumption simplifies calculations; and                 an individual non-floor panel, floor                  with glass surfaces should use NFRC
                                                  (3) using a single temperature avoids the               panel or door spans two temperature                   rating methods to certify performance.
                                                  complexity of accounting for various                    regimes, the lower temperature must be                (ACEEE, No. 1.3.034 at p. 2)
                                                  field installation variations (such as                  used for the purpose of calculating the                  In response to the comment from
                                                  concrete thickness and proximity to                     heat transfer across that component. For              Schott Gemtron, the Window 5.2
                                                  building walls).                                        example, if a floor panel spans a section             program does not incorporate WICF-
                                                     Regarding the heat transfer                          of the floor, where 80 percent of the                 specific doors at this time because
                                                  calculations for floorless coolers, Nor-                panel is exposed to cooler temperatures               NFRC, the primary user of Window 5.2,
                                                  Lake supported using Eq. 1 as proposed                  and the other 20 percent is exposed to                has never rated WICF doors. To remedy
                                                  in the January NOPR. (Nor-Lake, No.                     freezer temperatures, the heat transfer               this situation, the typical WICF door
                                                  1.3.029 at p. 4) Master-Bilt and Nor-Lake               calculation through the floor panel must              geometries would simply need to be
                                                  recommended that DOE consider using                     use only the freezer temperature.                     added to the Window 5.2 database.
                                                  the minimum thickness of 3.5 inches                        DOE believes the equations shown in                Because use of the NFRC ratings would
                                                  rather the 6 inches as proposed in the                  section 3.1 of Appendix A provide an                  avoid the need for DOE to prescribe
                                                  January NOPR for calculating the                        accurate means of testing a given walk-               specific geometries or testing scenarios,
                                                  concrete R-value, because the building                  in cooler, freezer or hybrid walk-in.                 however, DOE proposes in this SNOPR
                                                  industry uses 3.5 inches. (Master-Bilt,                 DOE seeks comment on the equations                    that instead of using Window 5.2,
                                                  No. 1.3.009 at p. 2 and Nor-Lake, No.                   and their accuracy, particularly for                  manufacturers shall rate the total
                                                  1.3.005 at p. 4)                                        hybrid walk-ins.                                      thermal transmittance (known as U-
                                                     In this SNOPR, DOE proposes                                                                                factor) of doors and windows, including
                                                                                                          8. U-Factor of Doors and Windows
                                                  different equations for calculating heat                                                                      their framing materials, using the test
                                                  transfer through floor panels, non-floor                   Conduction heat gain through doors                 procedure NFRC 100–2010–E0A1,
                                                  panels (i.e., wall and ceiling panels),                 and windows contributes to the energy                 ‘‘Procedure for Determining Fenestration
                                                  and non-glass doors. Although Nor-Lake                  load of the envelope. To account for this             Product U-Factors.’’ NFRC 100–2010–
                                                  supported using Eq. 1 as proposed in                    fact, DOE proposes to measure heat gain               E0A1 specifies a test procedure but does
                                                  the January NOPR, the equations                         through doors (with and without glass)                not specify test conditions, which
                                                  proposed in this SNOPR allow greater                    and any other glass surfaces such as                  depend on the product. Details of
                                                  flexibility in calculating heat transfer                windows, as well as through the framing               proposed test conditions may be found
                                                  through the envelope because they are                   materials used for doors and windows.                 in section 4.1.3 of Appendix A. DOE
                                                  able to account for unique temperature                  In the January NOPR, DOE proposed                     welcomes comments on improvements
                                                  differences across each component. See                  measuring heat gain through doors and                 that could be made to Window 5.2,
                                                  section III.B.7 for a more detailed                     windows using one of the following                    however, and would consider allowing
                                                  description of the equations in the                     options: (1) For doors with a National                use of Window 5.2 provided that such
                                                  SNOPR. The equation for floor heat                      Fenestration Rating Council (NFRC)                    improvements led to results as
                                                  transfer incorporates the results of FEM                rating, thermal performance would have                consistent as those achieved with the
                                                  simulation by using the values for the                  been determined from the NFRC label;                  NFRC rating.
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                                                  heat flow correction factor (qfloor) that               or (2) for doors without an NFRC rating,                 In addition, DOE proposes applying
                                                  appear in Eq. 2 above. In performing the                thermal performance parameters would                  the provisions in section 5.2 of NFRC
                                                  FEM simulation, DOE assumed 6-inch-                     have been determined using Window                     100–2010–E0A1, which would provide
                                                  thick concrete despite Master Bilt and                  5.2, a computer program developed by                  a uniform and reasonably accurate
                                                  Nor-Lake’s comments, because that is                    Lawrence Berkeley National Laboratory.                method of measuring the thermal
                                                  the recommended floor thickness in the                  75 FR 198. (The NRFC is a non-profit,                 transmittance of the door and window
                                                  ASHRAE Handbook of Fundamentals                         public-private partnership of the                     components installed in a walk-in. The
                                                  (ASHRAE Fundamentals 2005).                             window, door, and skylight industry.) In              section contains reference methods for


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                                                  55084               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  determining heat transfer properties for                detailed a number of requirements, such               state infiltration test, the techniques,
                                                  specific side-hinged exterior door                      as internal and external temperatures                 materials, and final assembly must be
                                                  systems, to all doors (i.e. doors without               during testing, sampling methods, and                 identical to units that are shipped to
                                                  any glass, doors with glass windows,                    gas tracer calculation type.                          customers. The unit must be assembled
                                                  glass display doors, etc.) and glass                       In comments on the January NOPR,                   following the instruction manual
                                                  walls. Doors, as defined in Appendix A                  interested parties noted the role that                supplied by the manufacturer. Details
                                                  2.1(b) of these proposed regulations,                   pressure relief valves play with respect              may be found in section 4.2 of
                                                  includes the user movable components                    to infiltration testing. These valves are             Appendix A.
                                                  and the framing components that                         standard equipment with walk-in                         DOE seeks comment on the
                                                  support the door hinges such as the                     envelopes and are designed to ensure                  modifications to the steady-state
                                                  center mullions in display doors or door                the proper operation of a WICF unit by                infiltration testing.
                                                  plugs found commonly in passage                         relieving pressure changes that
                                                                                                                                                                10. Door Steady-State Infiltration Test
                                                  doors. The complete assembly must be                    accompany rapid cooling of warm air
                                                  tested to find the door U-factor.                       after door opening events. Craig stated                  In the January NOPR, DOE proposed
                                                     NFRC 100–2010–E0A1 provides a                        that the standard pressure relief valve               testing steady-state infiltration on fully
                                                  means of testing representative door                    on walk-ins could interfere with                      assembled envelopes using the gas
                                                  geometry that can then be extrapolated                  infiltration testing, and Kason added                 tracer method described in ASTM
                                                  to other doors of similar materials and                 that WICF manufacturers use pressure                  E741–06, ‘‘Standard Test Method for
                                                  geometry. This approach is less costly                  relief ports that allow gas to move                   Determining Air Change in a Single
                                                  but generally results in more                           through the envelope and further                      Zone by Means of a Tracer Gas
                                                  conservative test results. However, if a                suggested that these ports would need to              Dilution.’’ The NOPR proposed an
                                                  door manufacturer or other party                        be blocked to test infiltration. (Craig,              additional series of tests, using ASTM
                                                  responsible for testing would prefer to                 No. 1.3.017 at p. 2 and Kason, No. at p.              E741–06, under certain conditions, and
                                                  perform the complete physical test                      3)                                                    would have required testing of all
                                                  described in NFRC 100–2010–E0A1 for                        Because bi-directional pressure relief             possible combinations of panels and
                                                  all doors (i.e. not rely on NFRC’s                      valves are considered standard                        doors.
                                                  extrapolation methodology), the testing                 equipment for all walk-in freezers,                      Interested parties recommended
                                                  entity may do so.                                       today’s notice clarifies that they should             several alternatives for DOE to consider.
                                                     DOE seeks comment on the proposal                    be included in the general steady-state               The Joint Utilities recommended the
                                                  requiring windows and doors, including                  infiltration test if they are part of the             NFRC rating method for determining
                                                  their framing materials, to be rated using              walk-in being tested. In addition,                    infiltration related to doors, in part
                                                  NFRC 100–2010–E0A1. As stated above,                    because valves contribute to steady-state             because this method, in their collective
                                                  DOE also seeks comment on                               infiltration, it is necessary to measure              view, provides a means to test and
                                                  improvements to the Window 5.2                          their contribution. The duration of the               sample products that would assure that
                                                  program that would make its use in the                  steady-state test is long enough to                   the sold product matches the quality of
                                                  test procedure appropriate.                             ensure that the average valve operation               the tested sample. (Joint Utilities, No.
                                                                                                          time is accurately represented. In                    1.3.019 at p. 12–13) Hired Hand
                                                  9. Walk-In Envelope Steady-State                                                                              recommended ASTM E330–97,
                                                                                                          addition, properly sited and designed
                                                  Infiltration Test                                                                                             ‘‘Standard Test Method for Structural
                                                                                                          valves should not be opening and
                                                      In the January NOPR, DOE noted two                  closing frequently, if at all, during                 Performance of Exterior Windows,
                                                  air exchange pathways for walk-in                       steady-state conditions. Because these                Doors, Skylights and Curtain Walls by
                                                  envelopes: (1) Air exchange                             valves are intended to relieve large                  Uniform Static Air Pressure Difference,’’
                                                  (‘‘infiltration’’) occurring during door                pressure swings caused by rapid cooling               or ASTM E283–92, ‘‘Standard Test
                                                  opening events, the extent of which                     of warm air that has entered during door              Method for Determining Rate of Air
                                                  depended on door opening area and the                   opening events, the pressure differential             Leakage Through Exterior Windows,
                                                  frequency of door opening, and (2)                      across the valve should be low enough                 Curtain Walls, and Doors Under
                                                  infiltration during ‘‘steady-state’’                    that it remains closed during steady                  Specified Pressure Differences Across
                                                  conditions. DOE defined steady-state as                 state operation.                                      the Specimen.’’ (Hired Hand, No.
                                                  the period of time when all access                         In the January NOPR, DOE also                      1.3.033 at p. 5)
                                                  methods, such as doors, were in the                     proposed to reduce testing burden by                     In this SNOPR, DOE is proposing
                                                  closed position. During steady-state                    allowing manufacturers to test the                    measuring steady-state infiltration
                                                  conditions, infiltration could occur via                infiltration of a limited number of                   through panels and doors using separate
                                                  cracks in door sweeps, bi-directional                   envelopes and then scale those results                tests for each rather than using a single
                                                  pressure relief valves, and panel-to-                   to all other envelopes manufactured.                  test for both as proposed in the January
                                                  panel interfaces. Infiltration during door              Interested parties agreed with DOE’s                  NOPR. DOE is considering this
                                                  opening events accounts for the majority                approach to reduce the testing burden                 modification to reduce testing burden;
                                                  of infiltration into the envelope, but                  but suggested that it was necessary for               the January NOPR proposed to require
                                                  steady-state infiltration could be                      DOE to provide detailed requirements of               a new test for each unique panel and
                                                  significant as well. Because air                        how the test units should be                          door configuration, which could be
                                                  infiltration plays a role in determining                constructed. Craig, American Panel, and               overly burdensome to test because of the
                                                  the overall efficiency of a given WICF                  ThermalRite stated that DOE must                      many possible configurations. For all
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  and the likely energy consumption in                    specify the basic unit to be tested in                doors, DOE is considering NFRC 400–
                                                  keeping its refrigerated areas cool, DOE                terms of size and certain components,                 2010–E0A1, ‘‘Procedure Determining
                                                  proposed using ASTM E741–06,                            which would be standardized across all                Fenestration Product Air Leakage.’’
                                                  ‘‘Standard Test Method for Determining                  manufacturers. (Craig, No. 1.2.010 at pp.             NFRC 400–2010–E0A1 is based on
                                                  Air Change in a Single Zone by Means                    102–103; American Panel, No. 1.3.024 at               ASTM E283–04, the most recent version
                                                  of a Tracer Gas Dilution,’’ for testing the             p. 2; ThermalRite, No. 1.3.031 at p. 1)               of ASTM E283–92, one of the test
                                                  steady-state air infiltration of walk-in                   DOE agrees with this approach and                  methods recommended by Hired Hand.
                                                  coolers and walk-in freezers. DOE                       proposes that with respect to the steady-             This test method is appropriate for this


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                                                                           Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                  55085

                                                  application because it was specifically                         11. Door Opening Infiltration                          and serviced by employees only). (Hired
                                                  designed to measure the air leakage                             Assumptions                                            Hand, No. 1.3.033 at p. 3) Schott
                                                  through doors and fenestration                                    In the January NOPR, DOE proposed                    Gemtron stated that DOE needs to
                                                  products. DOE adapted NFRC 400–                                 to incorporate several assumptions from                distinguish between glass display doors
                                                  2010–E0A1 for use with doors on walk-                           the ASHRAE Handbook of                                 and service doors because service doors
                                                  in envelopes by establishing standard                           Fundamentals 2009 related to door                      are not opened as often. (Schott
                                                  assumptions for the pressure                                    opening infiltration that would be used                Gemtron, Public Meeting Transcript,
                                                  differences, in Pascals (Pa), across                            to calculate the portion of time each                  No. 1.2.010 at p. 314) Hired Hand also
                                                  cooler and freezer doors and requiring                          doorway is open, Dt:                                   stated that DOE should clarify the
                                                  the infiltration at these pressures to be
                                                                                                                                                                         coverage of doors because they believe
                                                  determined using a pressure-infiltration
                                                                                                                              (        )
                                                                                                                             ⎡ P × θp + ( 60× θο ) ⎤                     the intent of EISA 2007 was targeted
                                                                                                                        Dt = ⎣                     ⎦
                                                  relationship determined through testing.
                                                                                                                                                              Eq. 3      mainly at retail applications with doors
                                                  Section 4.4.2 of proposed Appendix A
                                                  contains the assumptions and the                                                [3600× θd ]                            smaller than 45 inches in width. (Hired
                                                  method for finding the pressure-                                Where: 
                                               Hand, No. 1.3.033 at p. 1)
                                                  infiltration relationship. DOE does not                         P = number of doorway passages (i.e., 
                   DOE agrees with Hired Hand and
                                                  intend to incorporate ASTM E330–97,                                  number of doors opening events),                  Schott Gemtron that additional
                                                  ‘‘Standard Test Method for Structural                           qp = door open-close time (seconds/P),                 refinement to assumptions can be made
                                                  Performance of Exterior Windows,                                qo = time door stands open (minutes), and
                                                                                                                                                                         to differentiate between glass display,
                                                  Doors, Skylights and Curtain Walls by                           qd = daily time period (h). 75 FR 197.
                                                                                                                                                                         passage (or service), and freight doors.
                                                  Uniform Static Air Pressure Difference,’’                          For glass display doors and all other               In addition, to reflect the benefit from
                                                  as suggested by Hired Hand because this                         doors, DOE specified P = 72 and 60,                    the use of automated doors, DOE
                                                  procedure measures structural                                   respectively. Required values for qp: (1)              proposes to modify the value of qo when
                                                  performance, which does not impact                              reach-in glass doors, qp = 8 seconds; (2)              a sensor and automated open/close
                                                  efficiency; but DOE invites Hired Hand                          all other doors, qp = 15 seconds; and (3)
                                                                                                                                                                         system is included. Therefore, DOE
                                                  to submit further justification in support                      if an automatic door opener/closer is
                                                                                                                                                                         proposes to define ‘‘glass display door’’
                                                  of this standard. DOE seeks comment on                          used, qp = 10 seconds. DOE required
                                                  the proposal to test steady-state                               glass display doors qo = 0 minutes and                 as a door designed for the movement
                                                  infiltration through doors separately                           all other doors, qo= 15 minutes.                       and/or display of product rather than
                                                  from steady-state infiltration through                             Hired Hand proposed revised                         the passage of persons, ‘‘passage door’’
                                                  panels and using NFRC 400–2010–E0A1                             parameters for the number of door                      (or ‘‘service door’’) as an opaque door
                                                  for both tests. DOE seeks comment on                            openings (P), steady-state time, and all               that is less than or equal to a 45-inch
                                                  the proposed assumptions for the                                other parameters in the equation for                   width and designed for the passage of
                                                  pressure differential across cooler doors                       infiltration due to door openings both                 persons, and ‘‘freight door’’ as an opaque
                                                  (1.5 Pa) and freezer doors (3.5 Pa). DOE                        for doors with automatic door closures                 door that is greater than 45-inch width.
                                                  seeks comment on the proposal to                                and manually closed larger doors,                      DOE cannot specifically exclude doors
                                                  determine infiltration across cooler and                        because, in its view, the proposed                     wider than 45 inches if they are used on
                                                  freezer doors using tests of infiltration                       parameters are adequate for display                    a walk-in cooler or walk-in freezer that
                                                  and exfiltration at 10 Pa to 60 Pa to                           cases and small walk-ins but                           is not excluded from coverage by EISA
                                                  establish a pressure-infiltration                               insufficient for evaluating large retail               2007, as suggested by Hired Hand.
                                                  relationship with which to extrapolate                          supermarket applications (storage
                                                                                                                                                                            The new assumptions regarding doors
                                                  the infiltration occurring across cooler                        warehouse coolers and freezers where
                                                                                                                                                                         are reflected in Table III.4.
                                                  and freezer doors.                                              door entry width is greater than 4 feet

                                                                                                   TABLE III.4—ASSUMPTIONS TO DIFFERENTIATE DOOR TYPES
                                                                                                                         qp          qp,w sensor            qo          qo,w/sensor        qd
                                                                Door type                            P                                                                                                      Note
                                                                                                                        sec              sec                min             min            hrs

                                                  Glass Display ..........................                   72                8                 —                 0               —             24   Proposed in
                                                                                                                                                                                                        NOPR.
                                                      Passage ...........................                    60               15                 10               15               —             24
                                                      Freight ..............................                 60               15                 10               15               —             24
                                                  Glass Display ..........................                   72                8                 —                 0               —             24   SNOPR.
                                                      Passage ...........................                    60               15                 10               30               10            24
                                                      Freight ..............................                120               60                 30               60               20            24



                                                     DOE seeks comment on this                                       ThermalRite supported the infiltration              characteristics. Therefore, DOE proposes
                                                  alternative approach and modified                               reduction device (IRD) effectiveness test              several modifications to the IRD
                                                  assumptions.                                                    methodology, but stated that                           effectiveness test that it initially
                                                                                                                  manufacturers of IRDs should perform                   proposed. These modifications would
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  12. Infiltration Reduction Device
                                                  Effectiveness                                                   the testing. (ThermalRite, No. 1.3.031 at              permit testing to be done by the IRD
                                                                                                                                                                                                                       EP09SE10.036</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                                                                                  p. 2) DOE acknowledges that it may be                  manufacturer, the envelope
                                                     DOE discovered an error in Eq. 3–25
                                                                                                                  more appropriate for a third party to test             manufacturer, or another entity. The
                                                  after the January NOPR was published.
                                                                                                                  an IRD by itself, whether that third party             modifications that DOE is considering
                                                  DOE notified stakeholders of the error
                                                  and correction at the public meeting.                           is the IRD manufacturer or a different                 as alternatives to its initially proposed
                                                     DOE proposes to use the corrected Eq.                        entity, because IRD effectiveness is                   approach may be found in section 4.3 of
                                                  3–25 in the final rule.                                         largely independent of other envelope                  Appendix A.


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                                                  55086               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                     Hired Hand stated that DOE should                    prompted DOE to consider other options                  Consistent with its discussions at the
                                                  include an assumed performance value                    in addition to those proposed in the                  public meeting, DOE is also proposing
                                                  for IRDs that are subject to degradation                January NOPR.                                         to revise its proposed definition of the
                                                  and do not perform consistently over                                                                          term ‘‘refrigeration system’’ with respect
                                                                                                          1. Definition of Refrigeration System
                                                  time. (Hired Hand, No. 1.3.033 at p. 5                                                                        to WICF equipment. DOE requests
                                                  and Public Meeting Transcript, No.                         During the NOPR public meeting,                    comment on the proposed alternative
                                                  1.2.010 at p. 310) DOE believes it is                   DOE stated that it was considering the                definition.
                                                  reasonable to incorporate assumed                       following changes to the definition of
                                                                                                          refrigeration system: substituting                    2. Version of AHRI 1250
                                                  performance values because an
                                                  established body of research supports                   ‘‘integrated single package refrigeration                In the January NOPR, DOE proposed
                                                  these values. While the assumptions do                  unit’’ with ‘‘a packaged system where the             to incorporate the industry standard
                                                  not reflect all real-world WICF door use                unit cooler and condensing unit are                   AHRI 1250P–2009, ‘‘Standard for
                                                  scenarios or applications, it is necessary              integrated into a single piece of                     Performance Rating of Walk-In Coolers
                                                  for DOE to assume values to ensure a                    equipment’’ in order to clarify the term              and Freezers,’’ into the test procedure.
                                                  uniform testing method to rate walk-ins.                and substituting ‘‘central rack system’’              The January NOPR inadvertently
                                                  These assumptions are stated in section                 with ‘‘multiplex condensing system’’                  referred to the preliminary version of
                                                  4.3 of proposed Appendix A to this                      because the latter is a more inclusive                this standard, while the final published
                                                  SNOPR.                                                  term and may be more technically                      version is AHRI 1250–2009, which was
                                                     DOE seeks comment on this                            accurate.                                             published in September 2009. DOE
                                                  alternative approach.                                      Thermal-Rite and Nor-Lake expressed                found no significant differences
                                                                                                          support for the revised definition of                 between the preliminary version and the
                                                  13. Relative Humidity Assumptions                       refrigeration system. (Thermal-Rite, No.              final version; nevertheless, DOE
                                                     In the January NOPR, DOE proposed                    1.3.031 at p. 1; Nor-Lake, No. 1.3.029 at             proposes to incorporate the most recent
                                                  the assumption of an internal walk-in                   p. 2) ACEEE stated that the definition                version, AHRI 1250–2009, into the final
                                                  relative humidity of 45 percent. This                   proposed in the January NOPR seemed                   test procedure.
                                                  value was selected to match AHRI–1250                   appropriate and seems to recognize the
                                                  test dry-coil conditions. However, these                varieties serving the marketplace.                    3. Annual Walk-In Energy Factor
                                                  conditions do not necessarily reflect                   (ACEEE, No. 1.3.034 at p. 2) Master-Bilt,                DOE is required by EPCA to establish
                                                  general walk-in humidity conditions;                    BASF, and Kason all stated that they                  a test procedure to measure the energy
                                                  rather, the conditions were chosen to                   agreed with the definition but did not                use of walk-in coolers and walk-in
                                                  test refrigeration systems when there is                specify which version they supported.                 freezers. (42 U.S.C. 6314(a)(9)(B)(i))
                                                  little or no frost load on the evaporator               (Master-Bilt, No. 1.3.009 at p. 2; BASF,              AHRI 1250–2009 determines the annual
                                                  coil. DOE recognizes that, in practice,                 No. 1.3.003 at p. 5; Kason, No. 1.3.037               walk-in energy factor (AWEF) as its final
                                                  the relative humidity (RH) varies                       at p. 4) On the other hand, Craig stated              metric, the ratio of the annual net heat
                                                  significantly depending on the product                  that the definition of refrigeration                  removed from the box, which includes
                                                  stored within a walk-in.                                system should include a temperature                   the internal heat gains from non-
                                                     In order to reflect higher RH values                 limit and suggested 45 °F as the upper                refrigeration components but excludes
                                                  experienced in practice, DOE proposes                   limit. (Craig, No. 1.3.036 at p. 84) A                the heat gains from the refrigeration
                                                  a new assumption of 75 percent RH for                   person affiliated with Gonzaga Law also               components in the box to the annual
                                                  both freezer and cooler internal                        viewed the proposed definition of                     energy consumption. Because AWEF is
                                                  conditions. This RH level is within the                 refrigeration equipment as too inclusive              essentially a measure of efficiency, DOE
                                                  65–85 percent range of humidity levels                  but did not specify how DOE could                     proposed in the January NOPR to
                                                  used in practice for products from                      improve it. (William Gray, Gonzaga                    develop equations to derive energy
                                                  canned beverages such as beer to                        Law, No. FDMS 0003 at p. 1) HeatCraft                 consumption from AWEF. 75 FR 202–
                                                  packaged fruits and vegetables. DOE                     stated that DOE should have an                        203. DOE also proposed to require
                                                  seeks comment on this assumption in                     exemption for refrigeration equipment                 manufacturers to report both AWEF and
                                                  addition to assumptions found in                        that serves loads other than walk-ins.                energy consumption and asked for
                                                  proposed Appendix A, section 2.1(e).                    (HeatCraft, Public Meeting Transcript,                comment on this approach. 75 FR 202–
                                                                                                          No. 1.2.010 at p. 92)                                 203.
                                                  C. Refrigeration System                                    Regarding the above comments, DOE                     Nor-Lake agreed with the proposed
                                                    As previously discussed, DOE is                       believes that adding a temperature limit              method of measuring and calculating
                                                  proposing for the purposes of this test                 to the definition of refrigeration system,            the energy use of refrigeration systems
                                                  procedure to draw a distinction between                 as suggested by Craig, is unnecessary                 (Nor-Lake, No. 1.3.005 at p. 4) but also
                                                  the envelope or structure of the walk-in                because DOE is already proposing to                   cautioned that both the methodology for
                                                  cooler or walk-in freezer and the                       add a temperature limit to the definition             deriving annual energy consumption
                                                  mechanical refrigeration system                         of walk-ins that will cover both                      from AWEF and the reporting
                                                  performing the physical work necessary                  envelopes and refrigeration systems. To               requirements should be consistent
                                                  to cool the interior space. The                         address HeatCraft’s concern, DOE has                  across all manufacturers. (Nor-Lake, No.
                                                  refrigeration system itself could be one                included the term ‘‘multiplex                         1.3.029 at p. 5) Manitowoc, on the other
                                                  of three types: (1) Single-package                      equipment’’ in the definition to refer to             hand, stated that AWEF is a more useful
                                                  systems containing the condensing and                   refrigeration equipment serving loads                 metric than energy consumption
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  evaporator units; (2) split systems with                other than walk-ins. DOE’s revised                    because the calculated energy
                                                  the condensing unit and unit cooler                     definition includes unit coolers                      consumption may not be an accurate
                                                  physically separated and connected via                  connected to multiplex systems,                       representation of actual energy
                                                  refrigerant piping; or (3) rack systems                 meaning that only the unit cooler is                  consumption in the field as the load
                                                  utilizing unit coolers, which receive                   covered in any refrigeration system that              profile in the test procedure is arbitrary.
                                                  refrigerant from a shared loop. The                     incorporates a multiplex system. The                  Rather, AWEF can be used to easily
                                                  following section addresses issues                      multiplex systems themselves would                    estimate actual energy consumption if
                                                  raised by interested parties that                       not be covered.                                       the actual load is known, and AWEF


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                          55087

                                                  also allows for comparisons between                     The proposed test procedures will not                 Business Administration (SBA) for
                                                  higher and lower efficiency systems.                    affect the quality or distribution of                 review. This SNOPR includes changes
                                                  (Manitowoc, Public Meeting Transcript,                  energy and therefore will not result in               made to the IRFA in light of comments
                                                  No. 1.2.010 at p. 375) Arctic suggested                 environmental impacts. Therefore, DOE                 from interested parties on the January
                                                  that DOE could develop software to                      determined that this rule falls into a                NOPR, specifically regarding the
                                                  assist businesses with calculating                      class of actions that are categorically               number of small entities regulated and
                                                  energy consumption. (Arctic, Public                     excluded from review under the                        the potential testing burden. The revised
                                                  Meeting Transcript, No. 1.2.010 at p.                   National Environmental Policy Act of                  IRFA also considers the burden of new
                                                  392)                                                    1969 (42 U.S.C. 4321 et seq.) and DOE’s               tests that DOE is proposing in this
                                                     Because EISA requires that the test                  implementing regulations at 10 CFR part               SNOPR.
                                                  procedure measure energy use, as                        1021. More specifically, today’s
                                                                                                                                                                1. Reasons for the Proposed Rule
                                                  explained above, DOE continues to                       proposed rule is covered by the
                                                  propose that manufacturers measure                      categorical exclusion in paragraph A5 to                 The reasons for this proposed rule are
                                                  and report both AWEF and the measure                    subpart D, 10 CFR part 1021.                          discussed elsewhere in the preamble
                                                  of energy use derived from AWEF as                      Accordingly, neither an environmental                 and not repeated here.
                                                  determined by the test procedure. The                   assessment nor an environmental                       2. Objectives of and Legal Basis for the
                                                  calculation methodology and reporting                   impact statement is required.                         Proposed Rule
                                                  requirements will be consistent across                  C. Review Under the Regulatory
                                                  manufacturers as suggested by Nor-                                                                               The objectives of and legal basis for
                                                                                                          Flexibility Act                                       the proposed rule are discussed
                                                  Lake.
                                                     DOE notes that in the course of                         The Regulatory Flexibility Act (5                  elsewhere in the preamble and not
                                                  performing the test procedure and                       U.S.C. 601 et seq.) requires preparation              repeated here.
                                                  determining AWEF, the annual energy                     of an initial regulatory flexibility                  3. Description and Estimated Number of
                                                  use of a walk-in refrigeration system                   analysis (IRFA) for any rule that by law              Small Entities Regulated
                                                  may be found as an intermediate result                  must be proposed for public comment,
                                                                                                          unless the agency certifies that the rule,               DOE uses the SBA small business size
                                                  or easily derived from AWEF or other                                                                          standards published on January 31,
                                                  intermediate results. Thus, DOE                         if promulgated, will not have a
                                                                                                          significant economic impact on a                      1996, as amended, to determine whether
                                                  proposes to simplify the method by                                                                            any small entities would be required to
                                                  which energy use is determined by                       substantial number of small entities. As
                                                                                                          required by E.O. 13272, ‘‘Proper                      comply with the rule. 61 FR 3286; see
                                                  introducing revised calculations in the                                                                       also 65 FR 30836, 30850 (May 15, 2000),
                                                  rule language. DOE requests comment                     Consideration of Small Entities in
                                                                                                          Agency Rulemaking’’, 67 FR 53461                      as amended. 65 FR 53533, 53545
                                                  on the simplified calculations.                                                                               (September 5, 2000). The size standards
                                                     DOE does not intend to develop                       (August 16, 2002), DOE published
                                                                                                          procedures and policies on February 19,               are codified at 13 CFR part 121. The
                                                  software for calculating energy use, as                                                                       standards are listed by North American
                                                                                                          2003, to ensure that the potential
                                                  suggested by Arctic, because this is                                                                          Industry Classification System (NAICS)
                                                                                                          impacts of its rules on small entities are
                                                  outside the scope of the rulemaking.                                                                          code and industry description and are
                                                                                                          properly considered during the
                                                  The proposed test procedure contains                                                                          available at http://www.sba.gov/idc/
                                                                                                          rulemaking process. 68 FR 7990. DOE
                                                  all the necessary calculations for                                                                            groups/public/documents/
                                                                                                          has made its procedures and policies
                                                  determining AWEF and energy use, and                                                                          sba_homepage/serv_sstd_tablepdf.pdf.
                                                                                                          available on the Office of General
                                                  manufacturers may develop or use their                                                                           In the January NOPR, DOE classified
                                                                                                          Counsel’s Web site, http://
                                                  own software that assists them in                                                                             walk-in cooler and freezer equipment
                                                                                                          www.gc.doe.gov.
                                                  performing these calculations if they                      DOE reviewed the test procedures                   manufacturing under NAICS 333415,
                                                  choose.                                                 considered in today’s supplemental                    ‘‘Air-Conditioning and Warm Air
                                                  IV. Regulatory Review                                   notice of proposed rulemaking under                   Heating Equipment and Commercial
                                                                                                          the provisions of the Regulatory                      and Industrial Refrigeration Equipment
                                                  A. Review Under Executive Order 12866                   Flexibility Act and the procedures and                Manufacturing,’’ which has a size
                                                     The Office of Management and Budget                  policies published on February 19,                    standard of 750 employees. 75 FR 204.
                                                  (OMB) has determined that test                          2003.                                                 After reviewing industry sources and
                                                  procedure rulemakings do not constitute                    As discussed in more detail below,                 publicly available data, DOE identified
                                                  ‘‘significant regulatory actions’’ under                DOE found that because the proposed                   at least 37 small manufacturers of walk-
                                                  Executive Order (E.O.) 12866,                           test procedures have not previously                   in cooler and freezer envelopes and at
                                                  ‘‘Regulatory Planning and Review.’’ 58                  been required of manufacturers, all                   least 5 small manufacturers of walk-in
                                                  FR 51735 (October 4, 1993).                             manufacturers, including small                        cooler and freezer refrigeration systems
                                                  Accordingly, this action was not subject                manufacturers, could experience a                     that met this criterion.
                                                  to review under that Executive Order by                 financial burden associated with new                     In comments on the January NOPR,
                                                  the Office of Information and Regulatory                testing requirements. While examining                 both American Panel and Kysor said
                                                  Affairs (OIRA) of the OMB.                              this issue, DOE determined that it could              that virtually all panel and walk-in
                                                                                                          not certify that the proposed rule, if                manufacturers are small businesses
                                                  B. Review Under the National                            promulgated, would not have a                         under this standard. (American Panel,
                                                  Environmental Policy Act                                significant effect on a substantial                   Public Meeting Transcript, No. 1.2.010
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                                                    In this proposed rule, DOE proposes                   number of small entities. Therefore,                  at p. 379; Kysor, No. 1.3.035 at p. 3)
                                                  to adopt test procedures and related                    DOE prepared an IRFA for this                         Craig said that it was a small business
                                                  provisions for walk-in equipment. The                   rulemaking. The IRFA describes                        under this standard. (Craig, Public
                                                  test procedures would be used initially                 potential impacts on small businesses                 Meeting Transcript, No. 1.2.010 at p. 17)
                                                  for considering the adoption of energy                  associated with walk-in cooler and                    Schott Gemtron stated that over 90
                                                  conservation standards for walk-ins, and                freezer testing requirements. DOE has                 percent of the membership of the trade
                                                  DOE would require their use only if                     transmitted a copy of this IRFA to the                association of North American Food
                                                  standards were subsequently adopted.                    Chief Counsel for Advocacy of the Small               Equipment Manufacturers (NAFEM)


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                                                  55088               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  was under $12 million in sales. (Schott                 Envelope Manufacturer Testing Impacts                 sales.1 These reduced fees are 50
                                                  Gemtron, Public Meeting Transcript,                                                                           percent of members’ annual fees and
                                                  No. 1.2.010 at p. 389) Several                             In the January NOPR, DOE proposed                  product line fees (33 percent of non-
                                                  commenters listed sources DOE could                     to require envelope manufacturers to                  members’ annual fees and product line
                                                  use to identify small businesses: Nor-                  test their equipment in accordance with               fees), and a waiver of label fees. DOE
                                                  Lake recommended the NSF Standard 7                     two industry test standards: ASTM                     realizes that this definition differs from
                                                  listings, Arctic recommended the                        C1303–08, ‘‘Standard Test Method of                   the SBA size threshold set out for walk-
                                                  NAFEM database, and ICS                                 Predicting Long Term Thermal                          in envelope manufacturers but believes
                                                  recommended the central contractor                      Resistance of Closed-Cell Foam                        that some entities that are small
                                                  registry. (Nor-Lake, No. 1.3.029 at p. 5;               Insulation,’’ and ASTM E741–06,                       businesses pursuant to SBA’s size
                                                  Arctic, Public Meeting Transcript, No.                  ‘‘Standard Test Method for Determining                threshold could also qualify for these
                                                                                                          Air Change in a Single Zone by Means                  reduced fees.
                                                  1.2.010 at p. 388; and ICS, Public
                                                                                                          of a Tracer Gas Dilution’’ (ASTM C1303–                 To address the comments from Arctic,
                                                  Meeting Transcript, No. 1.2.010 at p.                                                                         ICS, BASF, Master-Bilt, American Panel,
                                                                                                          08 has since been updated to ASTM
                                                  390)                                                                                                          Hill Phoenix, and Craig regarding
                                                                                                          C1303–10, but the updated version
                                                     In light of these comments and                       contains no substantive changes that                  testing costs, DOE notes that provisions
                                                  additional research conducted by DOE,                   would affect the testing cost). DOE                   in the January NOPR and revisions to
                                                  the industry can be characterized by a                  spoke with industry experts to                        the proposed test procedure that are
                                                  few manufacturers that are subsidiaries                 determine the approximate cost of each                considered in this SNOPR allow
                                                  of much larger companies (who would                     test and determined that a test using                 manufacturers to test a limited number
                                                  not be considered small businesses) and                 ASTM C1303–08 costs between                           of models and model components and
                                                  a large number of small companies as                    approximately $5,000 and $10,000, and                 then calculate the performance of other
                                                  categorized by NAICS code 333415.                       a test using ASTM E741–06 costs                       models from the test results.
                                                  Furthermore, more than half of small                    between $1,000 and $5,000. Therefore,                 Measurements incorporating these
                                                  walk-in manufacturers have 100 or                       in the January NOPR, DOE estimated                    revisions include heat transfer through
                                                  fewer employees. DOE acknowledges                                                                             panels (see section III.B.1), steady state
                                                                                                          that the cost of testing for one walk-in
                                                  the sources provided by Nor-Lake,                                                                             infiltration through the envelope (see
                                                                                                          would range from $6,000 to $15,000.
                                                  Arctic, and ICS and will consider these                                                                       section III.B.9), and door and IRD
                                                                                                          Also, DOE estimated that a typical
                                                  sources in its characterization of the                                                                        performance (see section III.B.12). DOE
                                                                                                          manufacturer would have                               estimates that a typical envelope
                                                  industry in the final regulatory                        approximately 8 basic envelope                        manufacturer could be required to
                                                  flexibility analysis (FRFA).                            configurations that would need to be                  perform ASTM C1303–10 on between 1
                                                                                                          tested, so the total cost of compliance               and 2 types of foam; ASTM C1363–05
                                                  4. Description and Estimate of
                                                                                                          due to testing would be approximately                 on 1 to 2 types of panel pairs; ASTM
                                                  Compliance Requirements
                                                                                                          $84,000 (ranging from $48,000 to                      E741–06 on 1 to 2 envelopes; and NFRC
                                                     In the NOPR, DOE described potential                 $120,000). This estimated total cost only             testing on 1 to 3 types of doors and 1
                                                  impacts of the proposed test procedures.                includes the cost of one test on each                 to 3 types of IRD. The total cost of one
                                                  DOE received comments from                              basic configuration, and does not                     test on each type of walk-in or
                                                  manufacturers regarding the estimated                   include additional testing on the same                component listed could range from
                                                  impacts. Arctic stated that potential                   basic model that may be required as part              $8,000 to $46,000. This estimated cost
                                                  impacts of the proposed test procedures                 of a sampling plan. DOE may consider                  could vary significantly depending on
                                                  on manufacturers, including small                       development of a sampling plan in a                   the number of unique components
                                                  businesses, come from impacts                           future rulemaking.                                    incorporated into a particular
                                                  associated with the cost of testing.                       The revisions to the proposed test                 manufacturer’s walk-ins. Furthermore,
                                                  (Arctic, No. 1.3.012 at p. 1) ICS                       procedure that are proposed in this                   the estimated total cost only includes
                                                  commented that burden would come                        SNOPR for envelope manufacturers                      the cost of one test on each item listed.
                                                  both from testing cost and length of time               would require testing in accordance                   DOE may consider developing a
                                                  required to perform the tests. (ICS, No.                with the two tests mentioned above as                 sampling plan in a future rulemaking to
                                                  1.3.027 at p. 2) BASF commented on                      well as an additional test: ASTM                      determine how many tests need to be
                                                  specific tests, stating that ASTM C1303–                C1363–05, ‘‘Standard Test Method for                  performed on the same type of envelope
                                                  08 is more expensive than ASTM C518–                    Thermal Performance of Building                       or component, to ensure the test results
                                                  04 and that ASTM E741–06 and AHRI                       Materials and Envelope Assemblies by                  are repeatable and statistically valid.
                                                  1250–2009 were even more expensive.                     Means of a Hot Box Apparatus.’’ The                   Therefore, DOE welcomes comment on
                                                  (BASF, No. 1.3.003 at p. 5) Master-Bilt,                SNOPR would also require the                          this estimate.
                                                  American Panel, and Hill Phoenix all                    measurement of heat gain through doors                Refrigeration System Manufacturer
                                                  commented that the test procedure                       (with and without IRD and including                   Testing Impacts
                                                  would be particularly burdensome to                     glass doors) to be tested using NFRC
                                                                                                          procedures, rather than allowing for use                 The proposed test procedure for
                                                  small businesses. (Master-Bilt, No.
                                                                                                          of either the NFRC procedures or the                  refrigeration systems would require
                                                  1.3.009 at p. 3; American Panel, No.                                                                          manufacturers to perform testing in
                                                  1.3.024 at p. 4; Hill Phoenix, No. 1.2.023              Window 5.2 program. DOE determined
                                                                                                          that a test using ASTM C1363–05 costs                 accordance with a single industry test
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                                                  at p. 3) Craig asserted that the cost of                                                                      standard: AHRI Standard 1250–2009,
                                                  testing could be up to $1 million and                   between $1,000 and $3,000, and NFRC
                                                                                                                                                                ‘‘2009 Standard for Performance Rating
                                                  would be likely to put small companies                  testing cost varies between $1,000 and
                                                                                                                                                                of Walk-In Coolers and Freezers.’’
                                                  out of business or force them to sell                   $10,000 for all doors and IRDs
                                                                                                                                                                Because this test was recently
                                                  noncompliant products. (Craig, No.                      depending on product lines. However,
                                                                                                                                                                developed by the industry and has not
                                                  1.3.017 at p. 1; No. 1.3.036 at p. 4; and               NFRC has reduced fees for small
                                                  Public Meeting Transcript, No. 1.2.010                  businesses, which it defines as                         1 http://www.nfrc.org/documents/

                                                  at p. 18)                                               companies with less than $1 million in                ProgramCostsFactsheet.pdf.



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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                         55089

                                                  yet been widely used to test                            the burden of testing will be greater on              above. Instead of requiring ASTM
                                                  refrigeration systems, DOE could not                    small manufacturers because they will                 C1303–08 for testing the long-term
                                                  determine how much the test currently                   sell fewer units per type of basic model.             thermal properties of insulation, DOE
                                                  costs. However, DOE researched the cost                 (Kason, No. 1.3.037 at p. 4) Indeed, DOE              could require only ASTM C518–04,
                                                  of other, similar standards and                         does not expect that small                            ‘‘Standard Test Method for Steady-State
                                                  estimated in the January NOPR that a                    manufacturers would have fewer basic                  Thermal Transmission Properties by
                                                  test using AHRI Standard 1250–2009                      models than large manufacturers,                      Means of the Heat Flow Meter
                                                  would likely cost approximately $5,000.                 because the equipment is highly                       Apparatus,’’ which tests the thermal
                                                  DOE has not received evidence to the                    customized throughout the industry. A                 properties of insulation at a certain
                                                  contrary and thus maintains this                        small manufacturer could have the same                point in time (i.e., the point of
                                                  estimate for the SNOPR for a single test.               total cost of testing as a large                      manufacture). (Because ASTM C1303–
                                                  In the January NOPR, DOE estimated                      manufacturer, but this cost would be a                08 incorporates ASTM C518–04,
                                                  that the total testing cost for a typical               higher percentage of a small                          requiring ASTM C1303–08 is consistent
                                                  refrigeration manufacturer could be                     manufacturer’s annual revenues. Thus,                 with the statutory requirement for
                                                  approximately $250,000, based on an                     the differential impact associated with               basing measurement of the thermal
                                                  estimate of 50 basic models, but it could               walk-in cooler and walk-in freezer test               conductivity of the insulation on ASTM
                                                  be higher for manufacturers of more                     procedures on small businesses may be                 C518–04.) (42 U.S.C. 6314(a)(9)(A)) A
                                                  customized equipment. For instance, a                   significant even if the overall testing               test of ASTM C518–04 alone costs
                                                  manufacturer with 200 basic models                      burden is reduced as described above.                 approximately $500 to $1,000. However,
                                                  would incur a testing cost of                           DOE requests comment on quantitative                  DOE is considering ASTM C1303 for
                                                  approximately $1 million. Master-Bilt                   differential impacts and will consider                other reasons; namely, the concern that
                                                  stated that they sell over 160 models of                presenting such impacts in the FRFA.                  ASTM C518–04 alone does not capture
                                                  condensing units and 130 models of                         To further address concerns about                  the performance characteristics of a
                                                  evaporators, with over 1500                             costs, DOE notes that for both envelopes              walk-in over the period of its use,
                                                  combinations. (Master-Bilt, No. 1.3.009                 and refrigeration systems, DOE may                    because it does not account for
                                                  at p. 3) (DOE notes that Master-Bilt is                 consider development of a sampling                    significant changes in the thermal
                                                  not considered a small business because                 plan to determine how many units must                 properties of insulation over time.
                                                  it has more than 750 employees                          be tested to establish compliance and                    DOE also considered ASTM E1827–
                                                  including its parent company.) In                       enforcement requirements. In such a                   96(2007), ‘‘Standard Test Methods for
                                                  comments on the January NOPR, Craig                     rulemaking, however, DOE could also                   Determining Airtightness of Buildings
                                                  stated that under DOE’s estimated cost                  consider additional methods to reduce                 Using an Orifice Blower Door,’’ instead
                                                  of $250,000, small manufacturers would                  the testing burden on manufacturers.                  of ASTM E741–06, for testing
                                                  be forced to discontinue assembling                     For example, DOE could consider                       infiltration. ASTM E1827–96(2007)
                                                  their own refrigeration systems and                     allowing manufacturers to rely on                     costs about $300–$ to 500 for a single
                                                  instead purchase units from large                       component suppliers for test results,                 test. However, DOE believes that ASTM
                                                  manufacturers, making them less                         and manufacturers could then use these                E1827–96(2007) is not appropriate for
                                                  competitive. (Craig, No. 1.3.017 at p. 2)               values in their calculations of energy                walk-ins because it is conducted by
                                                  DOE further notes that the estimated                    consumption of the walk-in. DOE could                 placing test equipment in the door and
                                                  testing cost does not include cost of the               also allow manufacturers to group basic               thus does not account for infiltration
                                                  tested equipment and asks whether                       models into a ‘‘family’’ of models and                through the door, which is a major
                                                  manufacturers could sell equipment that                 only require the lowest-efficiency basic              component of infiltration in walk-ins. In
                                                  had been tested, thus reducing this cost.               model in the family to be certified. DOE              addition, it is not intended for testing
                                                     To address these concerns, DOE is                    could also consider allowing                          envelope systems, such as a walk-in,
                                                  proposing burden-reducing measures for                  manufacturers to use validated                        that have a large temperature difference
                                                  refrigeration system manufacturers                      alternative efficiency determination                  between the internal and external air.
                                                  similar to those for envelope                           methods, or AEDMs, which could                        Therefore, to complete a blower-door
                                                  manufacturers. The test procedure                       consist of a calculation or computer                  test, the walk-in could not be tested at
                                                  proposed in the January NOPR, AHRI                      program, to rate their equipment. DOE                 or close to operational temperatures,
                                                  1250–2009, which DOE continues to                       will consider the impacts to small                    resulting in a test that does not
                                                  propose in this SNOPR, allows for rating                businesses of future certification,                   accurately reflect its performance.
                                                  the condensing unit and the unit cooler                 compliance, and enforcement                              In the framework document, DOE
                                                  separately and then calculating their                   provisions for walk-in coolers and                    considered adapting an existing test
                                                  combined efficiency; this would reduce                  freezers in a later rulemaking.                       procedure for commercial refrigeration
                                                  testing burden by not requiring every                                                                         equipment, such as ARI Standard 1200–
                                                  combination to be tested. Allowing for                  5. Duplication, Overlap, and Conflict                 2006, ‘‘Performance Rating of
                                                  the use of such a calculation would                     with Other Rules and Regulations                      Commercial Refrigerated Display
                                                  significantly decrease the number of                       DOE is not aware of any rules or                   Merchandisers and Storage Cabinets,’’ as
                                                  tests.                                                  regulations that duplicate, overlap, or               an alternative to AHRI Standard 1250–
                                                     DOE recognizes the particular burden                 conflict with the rule being considered               2009. The two tests are based on a
                                                  of the envelope and refrigeration tests                 today.                                                similar methodology for rating
                                                  on small manufacturers. Because the                                                                           refrigeration equipment in general, but
                                                                                                          6. Significant Alternatives to the Rule
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                                                  cost of running each test is the same for                                                                     ARI Standard 1200–2006 requires
                                                  all manufacturers, both small and large,                   DOE considered a number of                         testing at only one set of ambient
                                                  and because DOE has proposed                            alternatives to the proposed test                     conditions, whereas AHRI Standard
                                                  measures to reduce burden on all such                   procedure, including test procedures                  1250–2009 requires testing at three sets
                                                  manufacturers, manufacturers would                      that incorporate industry test standards              of ambient conditions for refrigeration
                                                  likely incur comparable absolute costs                  other than the three proposed standards,              systems with the condensing units
                                                  as a result of the proposed test                        ASTM C1303–08, ASTM E741–06, and                      located outdoors. The additional time
                                                  procedures. However, Kason stated that                  AHRI Standard 1250P–2009, described                   required to test the system at three sets


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                                                  55090               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  of conditions would incur additional                    202 of UMRA requires a Federal agency                 not have a substantial direct effect on
                                                  cost and could make AHRI Standard                       to publish estimates of the resulting                 the States on the relationship between
                                                  1250–2009 more burdensome than ARI                      costs, benefits, and other effects on the             the national government and the States
                                                  Standard 1200–2006. However, DOE                        national economy. (2 U.S.C. 1532(a), (b))             or on the distribution of power and
                                                  believes that AHRI Standard 1250–2009                   UMRA also requires a Federal agency to                responsibilities among the various
                                                  is more appropriate for testing walk-ins                develop an effective process to permit                levels of government. EPCA governs and
                                                  than ARI Standard 1200–2006. A test                     timely input by elected officers of State,            prescribes Federal preemption of State
                                                  procedure based on ARI Standard 1200–                   local, and Tribal governments on a                    regulations as to energy conservation for
                                                  2006 would require the entire walk-in to                proposed ‘‘significant intergovernmental              the products that are the subject of
                                                  be tested as a whole, but manufacturers                 mandate’’ and requires an agency plan                 today’s proposed rule. States can
                                                  might not have a large enough test                      for giving notice and opportunity for                 petition DOE for exemption from such
                                                  facility to make the measurements                       timely input before establishing any                  preemption to the extent, and based on
                                                  necessary for the ARI 1200–2006 test                    requirements that might significantly or              criteria, set forth in EPCA. (42 U.S.C.
                                                  procedure in a controlled environment.                  uniquely potentially affect small                     6297) No further action is required by
                                                  Also, the refrigeration system is often                 governments. On March 18, 1997, DOE                   E.O. 13132.
                                                  manufactured separately from the                        published a statement of policy on its
                                                                                                                                                                H. Review Under Executive Order 12988
                                                  insulated envelope. In this case,                       process for intergovernmental
                                                  whoever assembled the two components                    consultation under UMRA. 62 FR12820.                     With respect to the review of existing
                                                  would bear the burden of conducting                     (also available at http://                            regulations and the promulgation of
                                                  ARI 1200–2006; this party might not be                  www.gc.doe.gov). The proposed rule                    new regulations, section 3(a) of E.O.
                                                  the manufacturer of the refrigeration                   published today does not provide for                  12988, ‘‘Civil Justice Reform’’, 61 FR
                                                  system. In contrast, AHRI 1250–2009                     any Federal mandate likely to result in               4729 (February 7, 1996), imposes on
                                                  tests only the refrigeration system. It                 an aggregate expenditure of $100                      Federal agencies the general duty to
                                                  does not require a larger test chamber                  million or more. Therefore, the UMRA                  adhere to the following requirements:
                                                  than other, similar tests and can be                    does not require a cost benefit analysis              (1) Eliminate drafting errors and
                                                  conducted by the manufacturer of the                    of today’s proposal.                                  ambiguity; (2) write regulations to
                                                  refrigeration system. Because AHRI                                                                            minimize litigation; and (3) provide a
                                                                                                          F. Review Under the Treasury and                      clear legal standard for affected conduct
                                                  1250–2009 requires the system to be
                                                                                                          General Government Appropriations                     rather than a general standard and
                                                  tested at three ambient temperatures, it
                                                                                                          Act, 1999                                             promote simplification and burden
                                                  captures energy savings from features
                                                  (e.g., floating head pressure) that allow                  Section 654 of the Treasury and                    reduction. Section 3(b) of E.O. 12988
                                                  the system to use less energy at lower                  General Government Appropriations                     specifically requires that Executive
                                                  ambient temperatures.                                   Act, 1999 (Pub. L. 105–277) requires                  agencies make every reasonable effort to
                                                     DOE requests comment on the                          Federal agencies to issue a Family                    ensure that the regulation (1) clearly
                                                  impacts to small business manufacturers                 Policymaking Assessment for any rule                  specifies the preemptive effect, if any;
                                                  for these and any other possible                        that may affect family well-being. This               (2) clearly specifies any effect on
                                                  alternatives to the proposed rule.                      proposed rule would not have any                      existing Federal law or regulation; (3)
                                                                                                          impact on the autonomy or integrity of                provides a clear legal standard for
                                                  D. Review Under the Paperwork                           the family as an institution.                         affected conduct while promoting
                                                  Reduction Act                                           Accordingly, DOE has concluded that it                simplification and burden reduction; (4)
                                                    DOE recognizes that if it adopts                      is not necessary to prepare a Family                  specifies the retroactive effect, if any; (5)
                                                  standards for walk-in coolers and walk-                 Policymaking Assessment.                              adequately defines key terms; and (6)
                                                  in freezers, once the standards become                                                                        addresses other important issues
                                                                                                          G. Review Under Executive Order 13132
                                                  operative, manufacturers would become                                                                         affecting clarity and general
                                                  subject to record-keeping requirements                     Executive Order 13132, ‘‘Federalism,’’             draftsmanship under any guidelines
                                                  associated with compliance with the                     64 FR 43255 (August 4, 1999), imposes                 issued by the Attorney General. Section
                                                  standards. Such record-keeping                          certain requirements on agencies                      3(c) of E.O. 12988 requires Executive
                                                  requirements would require OMB                          formulating and implementing policies                 agencies to review regulations in light of
                                                  approval pursuant to the Paperwork                      or regulations that preempt State law or              applicable standards in section 3(a) and
                                                  Reduction Act, 44 U.S.C. 3501, et seq.                  that have federalism implications. The                section 3(b) to determine whether they
                                                  DOE will comply with the requirements                   Executive Order requires agencies to                  are met or it is unreasonable to meet one
                                                  of the Paperwork Reduction Act if and                   examine the constitutional and statutory              or more of them. DOE has completed the
                                                  when energy conservation standards are                  authority supporting any action that                  required review and determined that, to
                                                  adopted.                                                would limit the policymaking discretion               the extent permitted by law, this
                                                                                                          of the States and carefully assess the                proposed rule meets the relevant
                                                  E. Review Under the Unfunded                            necessity for such actions. The                       standards of E.O. 12988.
                                                  Mandates Reform Act of 1995                             Executive Order also requires agencies
                                                    Title II of the Unfunded Mandates                     to have an accountable process to                     I. Review Under the Treasury and
                                                  Reform Act of 1995 (Pub. L. 104–4)                      ensure meaningful and timely input by                 General Government Appropriations
                                                  (UMRA) requires each Federal agency to                  State and local officials in the                      Act, 2001
                                                  assess the effects of Federal regulatory                development of regulatory policies that                  The Treasury and General
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                                                  actions on State, local, and Tribal                     have federalism implications. On March                Government Appropriations Act, 2001
                                                  governments and the private sector.                     14, 2000, DOE published a statement of                (44 U.S.C. 3516, note) provides for
                                                  With respect to a proposed regulatory                   policy describing the intergovernmental               agencies to review most disseminations
                                                  action that may result in the                           consultation process it will follow in the            of information to the public under
                                                  expenditure by State, local, and Tribal                 development of such regulations. 65 FR                guidelines established by each agency
                                                  governments, in the aggregate, or by the                13735. DOE has examined today’s                       pursuant to general guidelines issued by
                                                  private sector of $100 million or more                  proposed rule and has determined that                 OMB. Both OMB’s and DOE’s guidelines
                                                  (adjusted annually for inflation), section              it does not preempt State law and does                were published. 67 FR 8452 (February


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                           55091

                                                  22, 2002) and 67 FR 62446 (October 7,                   provides in part that where a proposed                status of the information and treat it
                                                  2002), respectively. DOE has reviewed                   rule contains or involves use of                      according to its determination.
                                                  today’s notice under the OMB and DOE                    commercial standards, the rulemaking                     Factors of interest to DOE when
                                                  guidelines and has concluded that it is                 must inform the public of the use and                 evaluating requests to treat submitted
                                                  consistent with applicable policies in                  background of such standards. The rule                information as confidential include (1) a
                                                  those guidelines.                                       proposed in this notice incorporates                  description of the items; (2) whether
                                                                                                          testing methods contained in the                      and why such items are customarily
                                                  J. Review Under Executive Order 13211                                                                         treated as confidential within the
                                                                                                          following commercial standards: ASTM
                                                     Executive Order 13211, ‘‘Actions                     C1303–08, ‘‘Standard Test Method of                   industry; (3) whether the information is
                                                  Concerning Regulations That                             Predicting Long Term Thermal                          generally known by or available from
                                                  Significantly Affect Energy Supply,                     Resistance of Closed-Cell Foam                        other sources; (4) whether the
                                                  Distribution, or Use’’, 66 FR 28355 (May                Insulation;’’ ASTM E741–06, ‘‘Standard                information has previously been made
                                                  22, 2001), requires Federal agencies to                 Test Method for Determining Air                       available to others without obligation
                                                  prepare and submit to the Office of                     Change in a Single Zone by Means of a                 concerning its confidentiality; (5) an
                                                  Information and Regulatory Affairs                      Tracer Gas Dilution;’’ and AHRI                       explanation of the competitive injury to
                                                  (OIRA), OMB, a Statement of Energy                      Standard 1250P, ‘‘2009 Standard for                   the submitting person which would
                                                  Effects for any proposed significant                    Performance Rating of Walk in Coolers                 result from public disclosure; (6) a date
                                                  energy action. A ‘‘significant energy                   and Freezers.’’ DOE has evaluated these               upon which such information might
                                                  action’’ is defined as any action by an                 standards and is unable to conclude                   lose its confidential nature due to the
                                                  agency that promulgated or is expected                  whether they fully comply with the                    passage of time; and (7) why disclosure
                                                  to lead to promulgation of a final rule,                requirements of section 32(b) of the                  of the information would be contrary to
                                                  and that is (1) a significant regulatory                Federal Energy Administration Act, i.e.,              the public interest.
                                                  action under E.O. 12866, or any                         whether they were developed in a
                                                  successor order; and (2) likely to have                                                                       B. Issues on Which DOE Seeks Comment
                                                                                                          manner that fully provides for public
                                                  a significant adverse effect on the                     participation, comment, and review. As                   DOE is particularly interested in
                                                  supply, distribution, or use of energy; or              required by section 32(c) of the Federal              receiving comments on the following
                                                  (3) designated by the Administrator of                  Energy Administration Act of 1974, as                 issues:
                                                  OIRA as a significant energy action. For                amended, DOE will consult with the                    1. Upper Limit of Walk-In Cooler
                                                  any proposed significant energy action,                 Attorney General and the Chairman of
                                                  the agency must give a detailed                                                                                  EPCA defines walk-in cooler or walk-
                                                                                                          the Federal Trade Commission before
                                                  statement of any adverse effects on                                                                           in freezer as ‘‘an enclosed storage space
                                                                                                          prescribing a final rule concerning the
                                                  energy supply, distribution, or use                                                                           refrigerated to temperatures,
                                                                                                          impact on competition of requiring
                                                  should the proposal be implemented,                                                                           respectively, above, and at or below 32
                                                                                                          manufacturers to use the methods
                                                  and of reasonable alternatives to the                                                                         degrees Fahrenheit that can be walked
                                                                                                          contained in these standards to test
                                                  action and their expected benefits on                                                                         into, and has a total chilled storage area
                                                                                                          walk-in equipment.
                                                  energy supply, distribution, and use.                                                                         of less than 3,000 square feet.’’ (42
                                                  Today’s regulatory action is not a                      V. Public Participation                               U.S.C. 6311(20)(A)) DOE proposes
                                                  significant regulatory action under E.O.                                                                      clarifying the term ‘‘refrigerated’’ within
                                                  12866. Moreover, it would not have a                    A. Submitting Public Comment                          the definition of walk-in cooler or walk-
                                                  significant adverse effect on the supply,                  DOE will accept comments, data, and                in freezer to distinguish walk-ins from
                                                  distribution, or use of energy. The                     information regarding the supplement to               conditioned storage spaces. DOE
                                                  Administrator of OIRA also did not                      the proposed rule no later than the date              proposes an upper limit of 55 °F
                                                  designate today’s action as a significant               provided at the beginning of this notice.             because this is a generally accepted
                                                  energy action. Therefore, it is not a                   Comments, data, and information                       boundary between ‘‘refrigerated space’’
                                                  significant energy action, and DOE has                  submitted to DOE’s e-mail address for                 and ‘‘conditioned space.’’ DOE requests
                                                  not prepared a Statement of Energy                      this rulemaking should be provided in                 comment on this proposal. For details,
                                                  Effects.                                                WordPerfect, Microsoft Word, PDF, or                  see section III.A.1.
                                                  K. Review Under Executive Order 12630                   text (ASCII) file format. Interested                  2. Basic Model of Envelope
                                                                                                          parties should avoid the use of special                  Although often manufactured
                                                    DOE has determined pursuant to E.O.
                                                                                                          characters or any form of encryption,                 according to the same basic design,
                                                  12630, ‘‘Governmental Actions and
                                                                                                          and wherever possible, comments                       walk-in envelopes are so highly
                                                  Interference with Constitutionally
                                                                                                          should include the electronic signature               customized that each walk-in a
                                                  Protected Property Rights’’, 53 FR 8859
                                                                                                          of the author. Comments, data, and                    manufacturer builds may be unique. To
                                                  (March 18, 1988), that this proposed
                                                                                                          information submitted to DOE via mail                 address this possibility, DOE proposed
                                                  rule would not result in any takings
                                                                                                          or hand delivery/courier should include               the following in the January NOPR: (1)
                                                  which might require compensation
                                                                                                          one signed original paper copy. No                    Grouping walk-in envelopes with
                                                  under the Fifth Amendment to the U.S.
                                                                                                          telefacsimiles (faxes) will be accepted.              essentially identical construction
                                                  Constitution.
                                                                                                             According to 10 CFR 1004.11, any                   methods, materials, and components
                                                  L. Review Under Section 32 of the                       person submitting information that he                 into a single basic model; and (2)
                                                  Federal Energy Administration (FEA)                     or she believes to be confidential and                adopting a calculation methodology for
                                                  Act of 1974
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                                                                                                          exempt by law from public disclosure                  determining the energy consumption of
                                                     Under section 301 of the Department                  should submit two copies: One copy of                 units within the basic model. 75 FR 189.
                                                  of Energy Organization Act (Pub. L. 95–                 the document including all the                           Upon further consideration, DOE
                                                  91), DOE must comply with section 32                    information believed to be confidential,              proposes in this SNOPR that a basic
                                                  of the Federal Energy Administration                    and one copy of the document with the                 model of walk-in envelope should
                                                  Act of 1974, as amended by the Federal                  information believed to be confidential               include equipment with the same
                                                  Energy Administration Authorization                     deleted. DOE will make its own                        design features, components,
                                                  Act of 1977. (15 U.S.C. 788) Section 32                 determination as to the confidential                  manufacturing method, etc., such that


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                                                  55092               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  units within the basic model are the                    SNOPR, DOE proposes that panels                       ensure that the rating of these walk-in
                                                  same with respect to the normalized                     (walls, ceilings, and floors) made with               cooler/freezer hybrids is properly
                                                  energy consumption as determined by                     foam insulation are tested using ASTM                 captured. DOE seeks comment on these
                                                  the test procedure (i.e., the energy                    C1363–05, ‘‘Standard Test Method for                  modifications and the accuracy of the
                                                  consumption divided by square feet of                   Thermal Performance of Building                       new equations. See section III.B.7 for
                                                  surface area.) DOE believes that this                   Materials and Envelope Assemblies by                  details.
                                                  definition of basic model will ensure                   Means of a Hot Box Apparatus,’’ for
                                                                                                                                                                10. U–Factor of Doors and Windows
                                                  that all equipment is accurately rated                  measuring the overall U-factor of fully-
                                                  and complies with the standard.                         assembled panels. The resulting                          DOE proposes to base the calculation
                                                    DOE recognizes this revised definition                composite panel U-factor found by                     of U-factor of doors and glass windows
                                                  of ‘‘basic model’’ is narrower than the                 ASTM C1363–05 will then be corrected                  on NFRC 100–2010–E0A1, ‘‘Procedure
                                                  definition proposed in the January                      using the LTTR results from ASTM                      for Determining Fenestration Product
                                                  NOPR. However, the increase in test                     C1303–10. DOE believes that using the                 U–Factors’’ and requests comment on
                                                  burden resulting from the narrower                      results from ASTM C1363–05 modified                   this proposal. For details, see section
                                                  definition could be offset by the burden-               by ASTM C1303–10 best captures the                    III.B.7.
                                                  reducing measures proposed elsewhere                    impact of structural members and long-                11. Envelope Infiltration
                                                  in the test procedure. Additionally, this               term R-value of foam products. DOE
                                                  definition would be consistent with the                 requests comment on this approach. For                   DOE proposes modifications to its
                                                  definition of basic model elsewhere in                  details, see section III.B.1.                         calculations and methodology for
                                                  the appliance standards program. The                                                                          determining steady state infiltration rate
                                                  proposed definition would provide a                     6. Alternatives to ASTM C1303–10                      through panel-to-panel and door-to-
                                                  way of distinguishing walk-ins that                        DOE proposes the use of alternative                panel interfaces. DOE also modified its
                                                  differ in energy consumption from walk-                 test methods found in Annex C of EN                   proposed assumptions for door opening
                                                  ins that differ only in cosmetic or non-                13165:2009–02 and EN 13164:2009–02                    infiltration and effectiveness of
                                                  energy-related features. DOE requests                   for determining the long term thermal                 infiltration reduction devices. DOE
                                                  comment on the proposed definition.                     resistance (LTTR) of walk-in panels                   requests comment on its approach and
                                                  For details, see section III.A.3.                       made using foam insulation. For details,              assumptions related to infiltration. For
                                                                                                          see section III.B.3.                                  details, see sections III.B.9, III.B.10,
                                                  3. Basic Model of Refrigeration                                                                               III.B.11, and III.B.12.
                                                     Interested parties commented that the                7. Improvements to ASTM C1303
                                                                                                          Methodology                                           12. Relative Humidity Assumptions
                                                  definition proposed in the January
                                                  NOPR was ambiguous; thus, DOE                              DOE proposes several modifications                   In the January NOPR, DOE proposed
                                                  proposes to clarify the definition.                     to the ASTM C1303 methodology to                      the assumption of an internal walk-in
                                                     As with envelopes, DOE must ensure                   address sample preparation and                        relative humidity of 45 percent to be
                                                  that all refrigeration systems are                      applicability to certain types of foam                consistent with dry-coil conditions in
                                                  accurately rated and comply with the                    used in walk-ins and requests comment                 the proposed refrigeration system test.
                                                  standard. Therefore, DOE proposes a                     on these modifications. For details, see              DOE recognizes that in practice the
                                                  definition for basic model of walk-in                   section III.B.5.                                      relative humidity (RH) varies
                                                  refrigeration such that units within the                                                                      significantly depending on the product
                                                                                                          8. Conduction Through Floors                          stored within a walk-in. Therefore, in
                                                  basic model must be the same with
                                                  respect to energy consumption as                           In the January NOPR, DOE proposed                  order to reflect higher RH values
                                                  determined by the test procedure. To                    an equation to calculate the heat transfer            experienced in practice, DOE proposes
                                                  relieve potential testing burden of many                through the floor of both insulated and               a new assumption of 75 percent RH for
                                                  combinations of equipment, the                          uninsulated WICF, and proposed                        both freezer and cooler internal
                                                  proposed test procedure provides for                    assumptions for subfloor temperature                  conditions. DOE seeks comment on this
                                                  rating a refrigeration system’s condenser               and floor R-value (where the floor is                 assumption. See section III.B.7 for
                                                  and evaporator separately and then                      provided separately from the panels).                 details.
                                                  calculating the system energy                           Between the publication of the January
                                                                                                          NOPR and the public meeting, DOE                      13. Definition of Refrigeration System
                                                  consumption. DOE requests comment
                                                  on the revised approach and definition                  completed additional finite element                      In the January NOPR, DOE proposed
                                                  of basic model of refrigeration. For                    model (FEM) computer simulations of                   a definition of refrigeration system and
                                                  details, see section III.A.4.                           floorless coolers. Based on FEM                       then presented a revised definition at
                                                                                                          simulation results, DOE described a new               the NOPR public meeting. In light of
                                                  4. Updates to Standards                                 equation during the public meeting for                comments from interested parties, DOE
                                                     After the NOPR was published, DOE                    calculating heat transfer through                     is proposing to incorporate its revised
                                                  learned that two of the standards                       floorless coolers. In light of this                   definition with some modification. DOE
                                                  incorporated by reference had been                      modeling and additional comments                      requests comment on the revised
                                                  updated. DOE proposes to incorporate                    from interested parties, DOE is                       definition and whether any previously
                                                  the updated versions in the final rule.                 proposing a new method for calculating                proposed versions of the definition are
                                                  For details, see sections III.B.4 and                   the heat transfer through certain floors.             preferable. See section III.C.1 for details.
                                                  III.C.2.                                                See section III.B.6 for more details.
                                                                                                                                                                14. Annual Walk-In Energy Factor
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                                                  5. Heat Conduction Through Structural                   9. ‘‘Hybrid’’ Walk-ins                                   DOE is required by EPCA to establish
                                                  Members                                                    In the January NOPR, the calculation               a test procedure to measure the energy
                                                     Interested parties commented that                    procedure provided a means of rating all              use of walk-in coolers and walk-in
                                                  DOE’s proposed test procedure did not                   walk-ins including the scenario when a                freezers. (42 U.S.C. 6314(a)(9)(B)(i))
                                                  account for heat conduction through                     freezer is sited inside a cooler or a                 AHRI 1250–2009 determines the annual
                                                  structural members of the envelope such                 cooler and freezer share a wall.                      walk-in energy factor (AWEF) as its final
                                                  as a wood frame. Therefore, in this                     Modifications described in this SNOPR                 metric, which is the ratio of the annual


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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                         55093

                                                  net heat removed from the box, which                    PART 431—ENERGY EFFICIENCY                            Thermal Resistance of Closed-Cell Foam
                                                  includes the internal heat gains from                   PROGRAM FOR CERTAIN                                   Insulation, approved 2010, IBR
                                                  non-refrigeration components but                        COMMERCIAL AND INDUSTRIAL                             approved for § 431.304.
                                                  excludes the heat gains from the                        EQUIPMENT                                                (3) ASTM C1363–05, Standard Test
                                                  refrigeration components in the box, to                                                                       Method for Thermal Performance of
                                                                                                            1. The authority citation for part 431              Building Materials and Envelope
                                                  the annual energy consumption. In the                   continues to read as follows:
                                                  course of performing the test procedure                                                                       Assemblies by Means of a Hot Box
                                                  and determining AWEF, the annual                            Authority: 42 U.S.C. 6291–6317.                   Apparatus, approved 2005, IBR
                                                                                                             2. Section 431.302 is amended by                   approved for § 431.304.
                                                  energy use of a walk-in refrigeration                                                                            (4) ASTM E283–04, Standard Test
                                                  system may be found as an intermediate                  adding the definitions for ‘‘Basic
                                                                                                          Model,’’ ‘‘Envelope,’’ ‘‘Refrigerated,’’              Method for Determining Rate of Air
                                                  result or easily derived from AWEF or                                                                         Leakage Through Exterior Windows,
                                                  other intermediate results. Thus, DOE                   ‘‘Refrigeration system,’’ and ‘‘Walk-in
                                                                                                          equipment’’ in alphabetical order to read             Curtain Walls, and Doors Under
                                                  proposes to simplify the method by                                                                            Specified Pressure Differences Across
                                                  which energy use is determined and                      as follows:
                                                                                                                                                                the Specimen, approved 2004, IBR
                                                  require manufacturers to determine both                 § 431.302 Definitions concerning walk-in              approved for § 431.304.
                                                  energy use and AWEF. DOE requests                       coolers and walk-in freezers.                            (5) ASTM E741–06 Standard Test
                                                  comment on the simplified calculations                     Basic model means—                                 Method for Determining Air Change in
                                                  in the rule language. For details, see                     (1) With respect to envelopes, all                 a Single Zone by Means of a Tracer Gas
                                                  section III.C.3.                                        units manufactured by a single entity,                Dilution, approved October 1, 2006, IBR
                                                                                                          which do not have any differing features              approved for Sec. 431.304.
                                                  15. Impacts on Small Businesses                         or characteristics that affect normalized                (c) AHRI. Air-Conditioning, Heating,
                                                                                                          energy consumption.                                   and Refrigeration Institute, 2111 Wilson
                                                     In the January NOPR, DOE prepared
                                                                                                             (2) With respect to refrigeration                  Boulevard, Suite 500, Arlington, VA
                                                  an initial regulatory flexibility analysis              systems, all units manufactured by a                  22201, (703) 600–0366, or http://
                                                  (IRFA) as required by the Regulatory                    single entity, which do not have any                  www.ahrinet.org.
                                                  Flexibility Act (5 U.S.C. 601 et seq.)                  differing electrical, physical, or                      (1) AHRI Standard 1250–2009, 2009
                                                  because it could not certify that the rule,             functional characteristics that affect                Standard for Performance Rating of
                                                  if promulgated, will not have a                         energy consumption.                                   Walk-In Coolers and Freezers, approved
                                                  significant economic impact on a                           Envelope means—                                    September 2009, IBR approved for
                                                  substantial number of small entities.                      (1) The portion of a walk-in cooler or             § 431.304.
                                                  DOE received comment from interested                    walk-in freezer that isolates the interior,             (2) [Reserved].
                                                  parties on the number of small entities                 refrigerated environment from the                       (d) CEN. European Committee for
                                                  and the expected economic impact of                     ambient, external environment; and                    Standardization (French: Norme or
                                                  the proposed test procedure on small                       (2) All energy-consuming components                German: Norm), Avenue Marnix 17, B–
                                                  entities and has revised the IRFA                       of the walk-in cooler or walk-in freezer              1000 Brussels, Belgium, Tel: + 32 2 550
                                                  accordingly. DOE continues to request                   that are not part of its refrigeration                08 11, Fax: + 32 2 550 08 19 or
                                                  comment on impacts to small business                    system.                                               http://www.cen.eu/.
                                                                                                             Refrigerated means held at a                         (1) EN 13164:2009–02, Thermal
                                                  manufacturers, particularly differential                temperature at or below 55 degrees                    insulation products for buildings—
                                                  impacts to small and large businesses.                  Fahrenheit using a refrigeration system.              Factory made products of extruded
                                                  More information, along with revisions                     Refrigeration system means the                     polystyrene foam (XPS)—Specification,
                                                  to the IRFA, can be found in section                    mechanism (including all controls and                 approved February 2009, IBR approved
                                                  IV.C.                                                   other components integral to the                      for § 431.304.
                                                  VI. Approval of the Office of the                       system’s operation) used to create the                  (2) EN 13165:2009–02, Thermal
                                                                                                          refrigerated environment in the interior              insulation products for buildings—
                                                  Secretary
                                                                                                          of a walk-in cooler or freezer, consisting            Factory made rigid polyurehane foam
                                                    The Secretary of Energy has approved                  of:                                                   (PUR) products—Specification,
                                                  publication of this supplement to the                      (1) A packaged system where the unit               approved February 2009, IBR approved
                                                  proposed rule.                                          cooler and condensing unit are                        for § 431.304.
                                                                                                          integrated into a single piece of                       (e) NFRC. National Fenestration
                                                  List of Subjects in 10 CFR Part 431                     equipment,                                            Rating Council, 6305 Ivy Lane, Ste. 140,
                                                                                                             (2) A split system with separate unit              Greenbelt, MD 20770, (301) 589–1776,
                                                    Administrative practice and                           cooler and condensing unit sections, or               or http://www.nfrc.org.
                                                  procedure, Confidential business                           (3) A unit cooler that is connected to               (1) NFRC 100–2010–E0A1, Procedure
                                                  information, Energy conservation,                       a multiplex condensing system.                        for Determining Fenestration Product U-
                                                  Incorporation by reference, Reporting                   *      *     *      *      *                          factors, approved June 2010, IBR
                                                  and recordkeeping requirements.                            Walk-in equipment means either the                 approved for § 431.304.
                                                    Issued in Washington, DC, on August 23,               envelope or the refrigeration system of                 (2) NFRC 400–2010–E0A1, Procedure
                                                  2010.                                                   a walk-in cooler or freezer.                          for Determining Fenestration Product
                                                                                                             3. In § 431.303, add new paragraphs                Air Leakage, approved June 2010, IBR
                                                  Cathy Zoi,
                                                                                                          (b)(2), (b)(3), (b)(4), (b)(5), (c), (d), and         approved for § 431.304.
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                                                  Assistant Secretary, Energy Efficiency and              (e) to read as follows:                                 4. Section 431.304 is revised to read
                                                  Renewable Energy.                                                                                             as follows:
                                                                                                          § 431.303 Materials incorporated by
                                                    For the reasons stated in the                         reference.                                            § 431.304 Uniform test method for the
                                                  preamble, DOE proposes to revise part                                                                         measurement of energy consumption of
                                                                                                          *    *    *    *     *
                                                  431 of chapter II of title 10, of the Code                                                                    walk-in coolers and walk-in freezers.
                                                                                                           (b) * * *
                                                  of Federal Regulations, to read as set                   (2) ASTM C1303–10, Standard Test                       (a) Scope. This section provides test
                                                  forth below.                                            Method of Predicting Long Term                        procedures for measuring, pursuant to


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                                                  55094               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  EPCA, the energy consumption of walk-                     (ii) Determine the annual energy                                                                n
                                                  in coolers and walk-in freezers.                        consumption of walk-in cooler and                      Annual Energy Consumption = ∑ E t j                ( )
                                                                                                          walk-in freezer refrigeration systems:                                                            j =1
                                                     (b) Testing and Calculations
                                                     (1) Determine the energy consumption                   (A) For systems consisting of an                    where tj and n represent the outdoor
                                                                                                          integrated single-package refrigeration                  temperature at each bin j and the number
                                                  of walk-in cooler and walk-in freezer                                                                            of hours in each bin j, respectively, for
                                                  envelopes by conducting the test                        unit or a split system with separate unit
                                                                                                                                                                   the temperature bins listed in Table D1
                                                  procedure specified in Appendix A to                    cooler and condensing unit sections,                     of AHRI Standard 1250–2009
                                                  this subpart.                                           where the condensing unit is located                     (incorporated by reference, see
                                                                                                          outdoors, by conducting the test                         § 431.303).
                                                     (i) Determine the Annual Walk-in
                                                                                                          procedure set forth in AHRI Standard
                                                  Energy Factor of walk-in cooler and                                                                             (B) For systems consisting of an
                                                                                                          1250–2009 (incorporated by reference,                 integrated single-package refrigeration
                                                  walk-in freezer refrigeration systems by
                                                                                                          see § 431.303) and recording the annual               unit or a split system with separate unit
                                                  conducting the test procedure set forth
                                                                                                          energy consumption term in the                        cooler and condensing unit sections,
                                                  in AHRI Standard 1250–2009
                                                                                                          equation for annual walk-in energy                    where the condensing unit is located in
                                                  (incorporated by reference, see
                                                                                                          factor in section 7:                                  a conditioned space, by performing the
                                                  § 431.303).
                                                                                                                                                                following calculation:


                                                                                                                                                 �            �
                                                                                                                                         0.33 × BLH + 0.67 × BLL
                                                                                             Annual Energy Consumption =
                                                                                                                                       Annual Walk-in Energy Factor

                                                         ˙         ˙
                                                  where BLH and BLL for refrigerator and                        walk-in energy factor is calculated from          (C) For systems consisting of a unit
                                                     freezer systems are defined in section                     the results of the test procedures set forth    cooler connected to a rack system, by
                                                     6.2.1 and 6.2.2, respectively, of AHRI                     in AHRI Standard 1250–2009                      performing the following calculation:
                                                     Standard 1250–2009 (incorporated by                        (incorporated by reference, see
                                                     reference, see § 431.303) and the annual                   § 431.303).


                                                                                                                                                 �            �
                                                                                                                                         0.33 × BLH + 0.67 × BLL
                                                                                             Annual Energy Consumption =
                                                                                                                                       Annual Walk-in Energy Factor

                                                          ˙         ˙
                                                  where BLH and BLL refrigerator and freezer              manner of movement; and that is used to               any surface(s), the ‘‘external conditions’’ of
                                                     systems are defined in section 7.9.2.2               produce or close off an opening in the walk-          the shared surface(s) should reflect the
                                                     and 7.9.2.3, respectively, of AHRI                   in. For walk-ins, a door includes the door            internal conditions of the neighboring walk-
                                                     Standard 1250–2009 (incorporated by                  panel, glass, framing materials, door plug,           in.
                                                     reference, see § 431.303) and the annual             mullion, and any other elements that form
                                                     walk-in energy factor is calculated from             the door or part of its connection to the wall.
                                                     the results of the test procedures set forth            (1) Passage door: A door designed for                 TABLE A.VI.1—TEMPERATURE AND




                                                                                                                                                                                                                            EP09SE10.039</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                     in AHRI Standard 1250–2009                           human passage or movement of product                      RELATIVE HUMIDITY CONDITIONS
                                                     (incorporated by reference, see                      through the walk-in. A passage door may
                                                     § 431.303).                                          accommodate a hand cart or equivalent.                                                    Value          Units
                                                    5. Appendix A is added to subpart R                      (2) Freight door: A door designed for
                                                                                                          human passage or movement of product                    Internal Conditions (cooled space within
                                                  of part 431 to read as follows:
                                                                                                          through the walk-in. A freight door may                                 envelope)
                                                  Appendix A to Subpart R of Part 431—                    accommodate a forklift or equivalent.
                                                  Uniform Test Method for the                                (3) Display door: A door designed for the          Cooler:
                                                  Measurement of Energy Consumption of                    movement and/or display of product rather               Dry Bulb Temperature ..              35              °F
                                                                                                          than the passage of persons                             Relative Humidity ..........         75              %
                                                  the Envelopes of Walk-In Coolers and
                                                                                                             (4) Glass door: A door comprised of 50             Freezer:
                                                  Walk-In Freezers                                        percent or more glass, irrespective of

                                                                                                                                                                                                                            EP09SE10.038</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                                                  Dry Bulb Temperature ..            ¥10               °F
                                                  1.0 SCOPE                                               intended use.
                                                                                                             (c) Surface area: Unless explicitly stated           Relative Humidity ..........        75               %
                                                     This appendix covers the test requirements
                                                  used to measure the energy consumption of               otherwise, the surface area for all
                                                                                                          measurements is the area as measured on the            External Conditions (space external to the
                                                  the envelopes of walk-in coolers and walk-in                                                                                   envelope)
                                                  freezers.                                               external surface of the walk-in.
                                                                                                             (d) Automatic door opener/closer: A device
                                                  2.0 DEFINITIONS                                         or control system that ‘‘automatically’’ opens        Freezer and Cooler:
                                                                                                          and closes doors without direct user contact            Dry Bulb Temperature ..              75              °F
                                                    The definitions contained in § 431.302 are
                                                  applicable to this appendix.                            (e.g., a motion sensor that senses when a               Relative Humidity ..........         52              %
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                          forklift is approaching the entrance to a door,
                                                  2.1 Additional Definitions                              opens, and then closes after the forklift has                       Subfloor Temperature
                                                                                                                                                                                                                            EP09SE10.037</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                     (a) Steady-state: The condition where the            passed).
                                                  average internal temperature changes less                  (e) Rating conditions: Unless explicitly               Freezers & Coolers:
                                                  than 1°C (2 °F) from one hour period to the             stated otherwise, all calculations and test              Temperature ..................      55              °F
                                                  next.                                                   procedure measurements shall use the
                                                     (b) Door: An assembly installed in or on an          temperature and relative humidity data
                                                  interior or exterior wall; that is movable in           shown in Table A.VI.1. For installations
                                                  a sliding, pivoting, hinged, or revolving               where two or more walk-in envelopes share



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                                                                       Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                                 55095




                                                                                                                                                                                                                                      EP09SE10.046</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  3.0 TEST APPARATUS AND GENERAL                              (b) Calculate the individual and total glass
                                                  INSTRUCTIONS                                              door surface area, Aglass door, as follows, ft2:
                                                  3.1 Conduction Heat Gain
                                                  3.1.1 Glass Area
                                                    (a) All dimensional measurements for glass
                                                  doors include the door frame and glass.



                                                                                                                         (                               )
                                                                                                      A glass door,i = Wglass door,i × H glass door,i × n i          (3-1)




                                                                                                                                                                                                                                      EP09SE10.045</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                     i

                                                                                                                   ⎣	        (
                                                                                              A glass door,tot = ∑ ⎡	 Wglass door,i × H glass door,i × n i ⎤
                                                                                                                                                           ⎦ )            (3-2)
                                                                                                                     l


                                                  Where:                                                    Wglass door,i = width of glass door (including                (c) Calculate the glass wall individual and
                                                  i = index for each type of unique glass door                   door frame), ft; and                                  total glass surface area, Aglass,wall, as follows,
                                                       used in cooler or freezer being tested;              Hglass door,i= height of glass door (including             ft2:




                                                                                                                                                                                                                                      EP09SE10.044</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  ni = number of identical glass doors of type                   door frame), ft.
                                                       i;



                                                                                                                         (                              )
                                                                                                      A glass wall,i = Wglass wall,i × H glass wall,i × n i          (3-3)


                                                                                                                     i

                                                                                                                    ⎣        (
                                                                                               A glass wall,tot = ∑ ⎡ Wglass wall,i × H glass wall,i × n i ⎤
                                                                                                                                                           ⎦ )           (3-4)
                                                                                                                     l




                                                                                                                                                                                                                                      EP09SE10.043</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                    ni = number of identical glass walls of type               Hglass,wall,i= height of glass wall (including
                                                  i = index for each type of unique glass wall                   i;                                                         glass framing), ft.
                                                       used in cooler or freezer being tested;              Wglass,wall,i = width of glass wall (including               (d) Calculate the total combined glass door
                                                                                                                 glass framing), ft; and                               and glass wall area, Aglass,tot, as follows, ft2:


                                                                                                         A glass,tot = A glass door,tot + A glass wall,tot       (3-5)




                                                                                                                                                                                                                                      EP09SE10.042</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where: 	                                                  3.1.2 Temperature Difference Across Glass
                                                  Aglass door, tot= total glass door area, ft2; and         Areas
                                                  Aglass wall, tot= total glass wall area, ft2.               (a) Calculate the temperature differential(s)
                                                                                                            DTglass door,j for each unique glass door as
                                                                                                            follows, °F:


                                                                                               ΔTglass door , j = TDB,int,glass door , j − TDB,ext ,glass door , j         -6)
                                                                                                                                                                         (3-


                                                                                                                                                                                                                                      EP09SE10.041</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                        temperature and a freezer glass door                   TDB,ext,glass door,j = dry-bulb air temperature
                                                  j= index for each type of unique glass door                   opens into external temperature, j=2;                       external to the door of type j, °F.
                                                       temperature differential used—for                    TDB,int,glass door,j = dry-bulb air temperature            (b) Calculate the temperature differential(s)
                                                       example if a freezer glass door opens into               inside the cooler or freezer where the                      DTglass,wall,j for each unique glass wall, as
                                                       a cooler internal conditioned                            door is located, °F;                                        follows (°F):


                                                                                                ΔTglass wall, j = TDB,int,glass wall, j − TDB,ext ,glass wall, j           -7)
                                                                                                                                                                         (3-
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                                                                                                                                                      EP09SE10.040</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                  Where:                                                    TDB,ext,glass,wall,j = dry-bulb air temperature            components Anon-floor panel edge,i, Anon-floor panel
                                                  j = index for each type of unique glass wall                  external to cooler or freezer, °F.                     edge,tot,Anon-floor panel core,i, Anon-floor panel core,tot,
                                                       temperature differential used;                       3.1.3 Non-Glass Area                                       Afloor panel edge,i, Afloor panel edge,tot, Afloor panel
                                                  TDB,int,glass,wall,j = dry-bulb air temperature                                                                      core,i, Afloor panel core,tot, Anon-glass door,i, and
                                                                                                              Calculate the individual and total surface               Anon-glass door,tot, as follows (ft2):
                                                       inside the cooler or freezer, °F; and 	              area of the walk-in non-glass envelope



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                                                  55096                 Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                    (a) Anon-floor panel edge,i, ft2, (see Figure 2 to
                                                  help visualize the area calculations)




                                                                                                                                                                                                                        EP09SE10.049</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                 i
                                                                     Anon-floor panel edge,i = ∑ ⎣ Xedge test region × ⎡ Wnon-floor panel,,i + Lnon-floor panel,i − Xedge test region ⎤ × ni ⎤
                                                                                                 ⎡
                                                                                                                       ⎣                                                              ⎦      ⎦         (3-8)
                                                                                                 1



                                                  Where:                                                           walk-in is constructed of non-floor                Wnon-floor panel,i = non-floor panel width, of
                                                  i = index for each type of unique non-floor                      panels that are all of identical                        thickness and underlying materials of
                                                       panel—for example, if a walk-in is                          thicknesses and identical materials but                 type i, ft; and
                                                       constructed of non-floor panels that are                    of non-floor panels of 15 different                Lnon-floor panel,i = non-floor panel length, of
                                                       of two different thicknesses or                             dimensions, i=15;                                       thickness and underlying materials of
                                                       manufactured using two different foam                  ni = number of identical panels of type i;                   type i, ft;




                                                                                                                                                                                                                        EP09SE10.048</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                       insulation products but panel                          Xedge test region = Panel Edge Test Region width,
                                                       dimensions are all identical, i=2 or, if a                  as shown in Figure 3, ft;                            (b) Anon-floor panel edge,tot, ft2


                                                                                                                                    i
                                                                                                      Anon-floor panel edge,tot = ∑ Anon -floor panel edge,i         (3-9)
                                                                                                                                    1


                                                  Where:                                                      Anon-floor panel edge, i= non-floor panel edge area,       (c) Anon-floor panel core,i, ft2
                                                  i = index for each type of unique non-floor                     of thickness and underlying materials of
                                                                                                                                                                                                                        EP09SE10.047</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                       panel; and                                                 type i, ft2.


                                                                                                          i
                                                                          Anon-floor panel core,i = ∑ ⎡ Wnon-floor panel,i × Lnon-floor panel,i × ni ⎤ − Anon-floor panel edge,i
                                                                                                      ⎣                                     l        ⎦                                         (3-10)
                                                                                                         1
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  Where:                                                      Anon-floor panel edge,i= panel non-floor edge area,     Lnon-floor panel,i = non-floor panel length, of
                                                  i = index for each type of unique non-floor                     of thickness and underlying materials of                 thickness and underlying materials of
                                                                                                                                                                                                                        EP09SE10.031</GPH><!--GPH SPAN=’’ DEEP=’’-->




                                                       panel;                                                     type i, ft2;                                             type i, ft;
                                                                                                              Wnon-floor panel,i = non-floor panel width, of
                                                  ni = number of identical panels, of thickness                                                                         (d) Anon-floor panel core,tot, ft2
                                                                                                                  thickness and underlying materials of
                                                       and underlying materials of type i;                        type i, ft; and




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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                      55097

                                                                                                                               i
                                                                                                   Anon-floor panel core,tot = ∑ Anon-floor panel core,i          (3 − 11)
                                                                                                                               1


                                                  Where:                                                   Anon-floor panel core, i= non-floor panel core area,        (e) Afloor panel edge,i, ft2
                                                  i = index for each type of unique non-floor                  of thickness and underlying materials of
                                                       panel; and                                              type i, ft2;


                                                                                               i




                                                                                                                                                                                                                        EP09SE10.055</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                      Afloor panel edge,i = ∑ ⎡ Xedge test region × ⎡ Wfloor panel,i + Lfloor panel,i − Xedge test region ⎤ × n1 ⎤
                                                                                                                    ⎣                       r                             ⎦                      (3-12)
                                                                                              ⎣                                                                                  ⎦
                                                                                              1


                                                  Where:                                                   Xedge test region = Panel Edge Test Region width,        Lfloor panel,i = floor panel length, of thickness
                                                  i = index for each type of unique floor panel;               as shown in Figure 3, ft;                                  and underlying materials of type i, ft;
                                                  ni = number of identical panels, of thickness            Wfloor panel,i = floor panel width, of thickness            (f) Afloor panel edge,tot, ft2;
                                                                                                               and underlying materials of type i, ft;
                                                       and underlying materials of type i;
                                                                                                               and




                                                                                                                                                                                                                        EP09SE10.054</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                i
                                                                                                       Afloor panel edge,tot = ∑ Afloor panel edge,i         (3-13)
                                                                                                                                1


                                                  Where:                                                   Afloor panel edge, i= floor panel edge area, of             (g) Afloor panel core,i, ft2
                                                  i = index for each type of unique floor panel;                thickness and underlying materials of
                                                       and                                                      type i, ft2.




                                                                                                                                                                                                                        EP09SE10.053</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                          i
                                                                                 Afloor panel core,i = ∑ ⎡ Wfloor panel,i × Lfloor panel,i × ni ⎤ − Afloor panel edge,i
                                                                                                         ⎣                                      ⎦                                  (3-14)
                                                                                                          1


                                                  Where:                                                   Afloor panel edge,i= floor panel edge area, of           Lnon-floor panel,i = floor panel length, of
                                                  i = index for each type of unique floor panel;                thickness and underlying materials of                    thickness and underlying materials of
                                                  ni = number of identical panels, of thickness                 type i, ft2;                                             type i, ft;
                                                                                                           Wnon-floor panel,i = floor panel width, of
                                                       and underlying materials of type i;                      thickness and underlying materials of                 (h) Afloor panel core,tot, ft2
                                                                                                                type i, ft; and




                                                                                                                                                                                                                        EP09SE10.052</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                i
                                                                                                       Afloor panel core,tot = ∑ Afloor panel core,i         (3-15)
                                                                                                                                1


                                                  Where:                                                   Afloor panel core, i= floor panel core area, of          (i) Anon-glass door,i, ft2
                                                    i = index for each type of unique floor                     thickness and underlying materials of
                                                  panel; and                                                    type i, ft2.


                                                                                                                                                                                                                        EP09SE10.051</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                 i
                                                                                          Anon-glass door,i = ∑ ⎡ Wnon-glass door,i × Hnon-glass door,i ⎤ × ni
                                                                                                                ⎣                                       ⎦                 (3-16)
                                                                                                                1


                                                  Where:                                                   ni = number of identical glass doors, of                 Hnon-glass door,i = non-glass door height, of
                                                  i = index for each type of unique non-glass                   thickness and underlying materials of                    thickness and underlying materials of
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                       door;                                                    type i;                                                  type i, ft.
                                                                                                           Wnon-glass door,i = non-glass door width, of
                                                                                                                                                                      (j) Anon-glass door,tot, ft2
                                                                                                                                                                                                                        EP09SE10.050</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                                                                                thickness and underlying materials of
                                                                                                                type i, ft; and




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                                                  55098                Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules




                                                                                                                                                                                                                                   EP09SE10.062</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                      i
                                                                                                          Anon-glass door,tot = ∑ Anon-glass door,i               (3-17)
                                                                                                                                      1


                                                  Where:                                                        Anon-glass door,i= non-glass door area, of                    (k) Anon-glass tot, ft2
                                                  i = index for each type of unique non-glass                       thickness and underlying materials of
                                                       door; and                                                    type i, ft2.


                                                             Anon-glass tot = Anon-floor panel edge,tot + Anon-floor panel core,tot + Afloor panel edge,tot + Afloor panel core,tot + Anon-glass door,tot     (3-18)




                                                                                                                                                                                                                                   EP09SE10.061</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                                                                          -



                                                  Where:                                                        Afloor panel edge, tot= floor panel edge total area,       3.1.4 Temperature Difference Across Non-
                                                  Anon-floor panel edge, tot= non-floor panel edge                   ft2;                                                  Glass Areas
                                                      total area, ft2;                                          Afloor panel core, tot= floor panel core total area,          Calculate the temperature differential(s)
                                                  Anon-floor panel core, tot= non-floor panel core                   ft2; and                                              DTnon-floor panel,j, DTfloor panel,j, and DTnon-glass
                                                      total area, ft2;                                          Anon-glass door,tot= non-glass door total area, ft2.       door,j, °F, as follows:
                                                                                                                                                                              (a) >Tnon-floor panel, j, °F




                                                                                                                                                                                                                                   EP09SE10.060</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                         ΔTnon-floor panel, j = TDB,int,non-floor panel, j − TDB,ext ,non-floor panel, j            (3-19)


                                                  Where:                                                        TDB,int, non-floor panel,j = dry-bulb air internal         TDB, ext, non-floor panel, j = dry-bulb air external
                                                  j = index for each type of non-floor panel                        temperature, °F. If the panel spans both                   temperature, °F.
                                                       temperature differential;                                    cooler and freezer temperatures, the                     (b) >Tfloor, j, °F
                                                                                                                    freezer temperature must be used; and


                                                                                                ΔTfloor panel, j = TDB,int,floor panel, j − TDB,ext ,floor panel, j          (3-20)




                                                                                                                                                                                                                                   EP09SE10.059</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                        TDB, int, floor panel, j = dry-bulb air internal           TDB, ext, floor panel, j = 55° F, as defined in Table
                                                  j = index for each type of floor panel                            temperature, °F. If the panel spans both                    A.VI.1.
                                                       temperature differential;                                    cooler and freezer temperatures, the                     (c) >Tnon-glass door, j, °F
                                                                                                                    freezer temperature must be used; and


                                                                                         ΔTnon-glass door, j = TDB,int,non-glass door, j − TDB,ext ,non -glass door, j             (3-21)




                                                                                                                                                                                                                                   EP09SE10.058</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                            cooler and freezer temperatures, the                   3.1.5 Conduction Heat Load Across Glass
                                                  j = index for each type of non-glass door                         freezer temperature must be used; and                  Areas
                                                       temperature differential;                                TDB, ext, non-glass door, j = dry-bulb air external        (a) Calculate the conduction load through the
                                                  TDB, int, non-glass door, j = dry-bulb air internal               temperature, °F.                                            glass doors, Qcond-glass, door, as follows btu/
                                                       temperature, °F. If the panel spans both                                                                                 h:


                                                                                                            i     j
                                                                                   Qcond,glass door = ∑∑ ⎡ Aglass door,i × ΔTglass door, j × Uglass door,i × ni, j ⎤
                                                                                                         ⎣                                               i         ⎦                     (3-22)
                                                                                                           1      1

                                                                                                                                                                                                                                   EP09SE10.057</MATH><!--MATH SPAN=’’ DEEP=’’-->

                                                  Where:                                                        Uglass door, i = thermal transmittance, U-factor           >Tglass door, j = temperature differential
                                                  i = index for each type of unique glass door;                      of the door, of type i, as rated by NFRC                   between refrigerated and adjacent zones
                                                  j = index for each type of glass door                              see section 4.4.1, Btu/h-ft2-°F;                           of type j, °F.
                                                        temperature differential;                               Aglass door, i = total surface area of all walk-           (b) Calculate the conduction load through the
                                                  ni, j = number of identical glass doors of type                    in glass doors of type i, ft2; and                         glass walls, (Qcond-glass, wall), btu/h, as
                                                        i with temperature differential j;                                                                                      follows:
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                            i      j
                                                                                                                                                                                                                                   EP09SE10.056</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                                                    Qcond,glass wall = ∑∑ ⎡ Aglass wall,i × ΔTglass wall,j × Uglass wall,i × ni, j ⎤
                                                                                                          ⎣                                              i         ⎦                    (3-23)
                                                                                                            1     1


                                                  Where:                                                        i = index for each type of unique glass wall;              j = index for each type of glass wall
                                                                                                                                                                                temperature differential;



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                                                                          Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                                              55099

                                                  ni, j = number of identical glass walls of type                    3.1.6 Panel Long Term Thermal                                             walk-in uses one foam type for non-floor
                                                        i with temperature differential j;                           Transmittance                                                             panels and another foam type for floor
                                                  Uglass, wall, i = thermal transmittance, U-factor                    (a) Calculate the foam degradation factor,                              panels, i=2;
                                                        of the glass wall, of type i, as rated by                    (DFi), unitless, as follows:                                        RLTTR, i = the R-value, from ASTM C1303–10,
                                                        NFRC see section 4.4.1 Btu/h-ft2-°F;                                                                                                   per 4.1.2 of foam type i, h-ft2-°F/Btu; and
                                                  Aglass, wall, i = total surface area of all walk-                                       R LTTR ,i                                      R0, i = the R-value of foam used for
                                                        in glass walls of type i, ft2; and                                       DFi =                        (3-24)                           determining EPCA compliance of foam
                                                  >Tglass, wall, j= temperature differential                                                 R 0,i                                             type i, h-ft2-°F/Btu.
                                                        between refrigerated and adjacent zones                      Where:                                                                 (b) Calculate the long term thermal
                                                        of type j, °F.                                               i= index each type of unique foam used in                           transmittance, (ULT, non-floor panel core, i), Btu/h-




                                                                                                                                                                                                                                                    EP09SE10.068</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                          the walk-in envelope—for example if a                          ft2-°F, as follows:


                                                                                                                                                Unon-floor panel core,i
                                                                                                            ULT,non-floor panel core,i =                                                 )
                                                                                                                                                                                    (3-25)
                                                                                                                                                           DFi


                                                  Where:                                                             Unon-floor panel core, i = the U-factor, per 4.1.1 of                  (c) Calculate the long term thermal
                                                  i= index each type of unique foam used in                              foam type i, Btu/h-ft2-°F; and                                  transmittance, (ULT, floor panel core, i), Btu/h-ft2-
                                                       the walk-in envelope;                                         DFi = the degradation of foam type i, unitless.                     °F, as follows:




                                                                                                                                                                                                                                                    EP09SE10.067</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                                Ufloor panel core,i

                                                                                                                     ULT,floor panel core,i =                                  (3-26)

                                                                                                                                                       DFi


                                                  Where:                                                             DFi = the degradation of foam type i, unitless. 	 Qcond-floor panel, Qcond-non-glass door and
                                                  i= index each type of unique foam used in                          3.1.7 Conduction Heat Load Across Non-
            Qcond-non-glass, as follows btu/h:
                                                       the walk-in envelope;                                         Glass Areas                                          (a) Qcond-non-floor panel, btu/h, 

                                                  Ufloor panel core, i = the U-factor, per 4.1.1 of                     Calculate the conduction heat load through 





                                                                                                                                                                                                                                                    EP09SE10.066</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                       foam type i, Btu/h-ft2-°F; and                                all non-glass components: Qcond-non-floor panel, 



                                                                               i   j
                                                      Qcond-non-floor panel = ∑∑ ⎡ ΔTnon-floor panel, j × ⎡	 Anon-floor panel edge,i × Unon-floor panel edge,i × ni, j + Anon-floor panel core,i × ULT,non-floor panel, core,i × ni, j ⎤ ⎤ (3-27)
                                                                                  ⎢
                                                                              1 1 ⎣
                                                                                                          ⎢	
                                                                                                          ⎣
                                                                                                             (                                                )            (              c                                 )          ⎥⎥
                                                                                                                                                                                                                                       ⎦⎦
                                                                                                                                                                                                                                               7



                                                  Where:                                                             DTnon-floor panel,j = temperature differential                      Anon-floor panel edge,i = area of non-floor panel
                                                  i = index for each type of unique component                            across the non-floor panels of type i, °F;                          edge of type i, ft2; and
                                                        of type i;                                                   Unon-floor panel edge,i = U-factor for panel edge                   Anon-floor panel core,i = area of non-floor panel




                                                                                                                                                                                                                                                    EP09SE10.065</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  j = index for each unique temperature                                  area type i, per 4.1.1, Btu/h-ft2-°F;                               core of type i, ft2.
                                                        differential of type j;                                      ULT,non-floor panel core,i = Long term thermal
                                                                                                                                                                                           (b) Qcond-floor panel, btu/h,
                                                  ni,j = number of identical non-floor panels of                         transmittance of foam type i, per section
                                                        type i with temperature differential;                            4.1.1, Btu/h-ft2-°F;


                                                                                       i   j
                                                            Qcond-floor panel i, j = ∑∑ ⎡ ΔTfloor panel, j × ⎡ Afloor panel edge,i × Ufloor panel edge,i × ni , j + Afloor panel core,i × ULT,floor panel core,i × ni , j ⎤ ⎤
                                                                                         ⎢
                                                                                     1 1 ⎣
                                                                                                             ⎢
                                                                                                             ⎣
                                                                                                                 (                                        )            (                                         )        ⎥⎥
                                                                                                                                                                                                                          ⎦⎦
                                                                                                                                                                                                                                 (3-28)




                                                                                                                                                                                                                                                    EP09SE10.064</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                             DTnon-floor panel,j = temperature differential                      Afloor panel core,i = area of floor panel core of
                                                  i = index for each type of unique component                             across the floor panels of type i, °F;                               type i, ft2.
                                                                                                                     Ufloor panel edge,i = U-factor for panel edge area
                                                        of type i;                                                                                                                          (1) Exception to Qcond-floor panel: If the walk-
                                                                                                                          type i, per 4.1.1, Btu/h-ft2-°F;
                                                  j = index for each unique temperature                              ULT,floor panel core,i = Long term thermal                          in is at cooler temperature and has an
                                                        differential of type j;                                           transmittance of foam type i, per 4.1.1,                       uninsulated floor, then Qcond-floor panel, btu/h,
                                                  ni,j = number of identical floor panels of type                         Btu/h-ft2-°F;                                                  is as follows:
                                                        i with temperature differential j;                           Afloor panel edge,i = area of floor panel edge of                      (i) If Afloor ≤ 750 ft2, then
                                                                                                                          type i, ft2; and
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                                                           −0.364
                                                                                                              Qcond-floor panel = 33.153× Afloor × Afloor                         (3-28)
                                                                                                                                                                                                                                                    EP09SE10.063</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                     (ii) If Afloor > 750 ft2, then




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                                                                                                                                                                                                                              EP09SE10.076</MATH><!--
                                                  55100               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules




                                                                                                                                                                                                                              EP09SE10.075</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                 Qcond-floor panel = [ 0.0002× Afloor + 2.84] × Afloor                (3-29)


                                                  Where:                                                      Afloor = total area of the floor, as measured                (2) Exception to Qcond-floor panel: If the walk-
                                                                                                                   from the walk-in architectural drawing,              in is at freezer temperature and an insulated
                                                                                                                   ft2.                                                 floor has not being shipped with the walk-
                                                                                                                                                                        in, then Qcond-floor panel, is as follows btu/h:


                                                                                                                                                      1
                                                                                                     Qcond-floor panel = ΔTfloor × Afloor ×                          (3-30)




                                                                                                                                                                                                                              EP09SE10.074</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                              R Freezer floor


                                                  Where:                                                      DTfloor = temperature differential across the               (c) Qcond-non-glass door, btu/h,
                                                  Afloor = total area of the floor, as measured                    freezer floor as defined in 3.1.4(b), °F
                                                       from the walk-in architectural drawing,                Rfreezer floor = 28 ft2-°F-h/Btu, as required by
                                                       ft2.                                                        EPCA.


                                                                                                      i   j
                                                                            Qcond-non-glass door = ∑ ∑ ⎡ ΔTnon -glass door, j × ⎡ Anon -glass door,i × Unon-glass door,i ⎤ × ni , j ⎦
                                                                                                                                                                                    ⎤      (3-31)




                                                                                                                                                                                                                              EP09SE10.073</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                       ⎣                        ⎣                                        ⎦
                                                                                                      1   1



                                                  Where:                                                      ni,j = number of identical non-glass doors of             Anon-glass door,i = area of floor panel edge of
                                                  i = index for each type of unique component                       type i with temperature differential j;                 type i, ft2.
                                                                                                              DTnon-non glass door,j = temperature differential
                                                       of type i;                                                                                                         (d) Total conduction load for non-glass
                                                                                                                    across the floor panels of type i, °F;
                                                  j = index for each unique temperature                       Unon-glass door,i = U-factor for panel edge area          areas, Qcond-non-glass, as follows btu/h:
                                                       differential of type j;                                      type i, per 4.4.1, Btu/h-ft2-°F; and




                                                                                                                                                                                                                              EP09SE10.072</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                              Qcond-non-glass = Qcond-non-floor panel + Qcond-floor panel + Qco
                                                                                                                                              ond-non-glass door                          (3-32)


                                                  Where:                                                      Qcond-floor panel = conduction through floor                (1) Exception: If calculating Qcond-non-glass
                                                  Qcond-non-floor panel = conduction through non-                 panels, btu/h; and                                    for an uninsulated cooler or for a freezer
                                                      floor panels, btu/h;                                    Qcond-non-glass door = conduction through non-            where an insulated floor is not part of walk-
                                                                                                                  glass doors, btu/h.                                   in, calculate as follows:


                                                                             Qcond-non-glass = Qcond-floor panel + Qcond -non -floor panel + Qco -non -glass door
                                                                                                                                               ond                                        (3-33)




                                                                                                                                                                                                                              EP09SE10.071</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                      Qcond-floor panel = conduction through floor, as          3.1.8 Total Conduction Load
                                                  Qcond-non-floor panel = conduction through non-                 found in 3.1.7(b)(1) or (2) btu/h; and                  (a) Calculate total conduction load, Qcond,
                                                      floor panels, btu/h;                                    Qcond-non-glass door = conduction through non-
                                                                                                                                                                        as follows btu/h:
                                                                                                                  glass doors, btu/h.


                                                                                         Qcond = Qcond-non-glass + Qcond ,glass wall + Qcond ,glass door                         34)
                                                                                                                                                                              (3-3

                                                                                                                                                                                                                              EP09SE10.070</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                      3.2 Infiltration Heat Gain                                Where:
                                                  Qcond-non-glass = total conduction load through             3.2.1 Steady State Infiltration Calculations              TDB-int,R = the dry-bulb temperature of
                                                      non-glass components of walk-in, Btu/h;                   (a) Convert dry-bulb internal and external                   internal walk-in air, °R; and
                                                  Qcond-glass,wall = total conduction load through            air temperatures from °F to Rankine (°R), as              TDB-ext,R = the average dry-bulb temperature
                                                      walk-in glass walls, Btu/h; and                         follows:                                                       of air surrounding the walk-in, °R.
                                                  Qcond-glass,door = total conduction load through                                                                        (b) Calculate the water vapor saturation
                                                      walk-in glass doors, Btu/h.                               TDB-int,R = TDB-int + 459.67                (3-35)      pressure for the external air and the internal
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                                                                                        refrigerated air, as follows:
                                                                                                                                                                          (1) If TDB,R < 491.67 °R (32 °F), use the
                                                                                                                                                                                                                              EP09SE10.069</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                                                                                                                                        following equation to calculate water vapor
                                                                                                                TDB-ext,R = TDB-ext + 459.67                (3-36)      saturation pressure (Pws in psia):




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                                                                                                                                                                                                                               EP09SE10.084</MATH><!--
                                                                       Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                         55101




                                                                                                                                                                                                                               EP09SE10.083</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                   ⎡⎛ C           ⎞	                                                                                                                 ⎤
                                                         Pws = exp ⎢⎜ 1	
                                                                    ⎜
                                                                   ⎢	 TDB,R       ⎟                              (
                                                                                  ⎟ + C2 + ( C3 × TDB,R ) + C4 × TDB,R + C5 × TDB,R + C6 × TDB,R + C 7×1n ( TDB,R )
                                                                                                                      2
                                                                                                                                  ) (
                                                                                                                                   3            4
                                                                                                                                                      ) (                  ) (                      )⎥
                                                                                                                                                                                                     ⎥       (3-37)
                                                                   ⎣⎝             ⎠	                                                                                                                 ⎦

                                                  Where: 	                                                 C2 = ¥4.8932428 E+00,                                       C7 = 4.1635019 E+00.
                                                  TDB,R = dry-bulb temperature in Rankine (for 	           C3 = ¥5.3765794 E–03,                                         (2) If TDB,R > 491.67 °R (32 °F), use the
                                                      the internal or external air), 	                     C4 = 1.9202377 E–07,                                        following equation to calculate water vapor
                                                                                                           C5 = 3.5575832 E–10,
                                                  C1 = ¥1.0214165 E+04, 	                                                                                              saturation pressure, Pws, psia:
                                                                                                           C6 = ¥9.0344688 E–14, and




                                                                                                                                                                                                                               EP09SE10.082</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                             ⎡⎛ C          ⎞	                                                                                                ⎤
                                                                   pws = exp ⎢⎜ 8	
                                                                             ⎢⎜ TDB,	R     ⎟                              (	                ) (
                                                                                           ⎟ + C9 + ( C10 × TDB,R ) +	 C11 × TDB,R + C12 × TDB,,R + C13 ×1n ( TDB,R )
                                                                                                                                  2              3
                                                                                                                                                                     ) (                    )⎥
                                                                                                                                                                                             ⎥
                                                                                                                                                                                                    (3-38)
                                                                             ⎣⎝            ⎠	                                                                                                ⎦

                                                  Where:                                                   C13 = 6.5459673 E+00.                                       Where:
                                                  TDB,R = dry-bulb temperature (for the internal             (c) Calculate the absolute humidity ratio,                RH = relative humidity in (for the internal or
                                                      and external air), °R;                               w, as follows:                                                   external air), and




                                                                                                                                                                                                                               EP09SE10.081</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  C8 = ¥1.0440397 E+04;                                                                                                Pws = water vapor saturation pressure, psia.
                                                  C9 = ¥1.1294650 E+01;
                                                                                                                 ⎡ 0.621945 × ( RH × Pws ) ⎤                             (d) Calculate air specific volume, v, (ft3/lb),
                                                  C10 = ¥2.7022355 E–02;                                    ω = 	⎢	                        ⎥                (3-39)
                                                                                                                 ⎣ 14.696 − ( RH × Pws ) ⎥
                                                  C11 = 1.2890360 E–05; 	                                                                                              as follows:
                                                                                                                 ⎢                         ⎦
                                                  C12 = ¥2.4780681 E–09; and


                                                                                                 v = ⎢(0.025209989) ×TDB,R × (1+ (1.6078× ω))⎥
                                                                                                     ⎣                                       ⎦                         (3-40)


                                                  Where:                                             (e) Calculate air density, air density, lb/ft3,                   Where:




                                                                                                                                                                                                                               EP09SE10.080</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  TDB,R = dry-bulb temperature (for the internal 	 as follows:                                                         v = specific volume of air, ft3/lb.
                                                       or external air), °R; and                                                                                         (f) Calculate the enthalpy for the internal
                                                                                                                       1
                                                  v = specific volume of air, ft3/lb.                            ρ=          (3-41)                                    and external air, h, as follows btu/lb:
                                                                                                                                     ν


                                                                                                                                 (
                                                                                                h = ( 0.240× TDB,F ) + ω × 1061+ ( 0.444× TDB,F )                )      (3-42)




                                                                                                                                                                                                                               EP09SE10.079</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                              (h) Calculate the steady state infiltration                       ˙
                                                                                                                                                                       VL = the normalized infiltration rate per
                                                                                                                        ˙
                                                  TDB,F = dry-bulb temperature (for the internal 	 rate of the walk-in,Vj, ft /h:
                                                                                                                             3                                               section 4.2 of this document using the
                                                       or external air), °F; and                                                                                             architectural drawing of the walk-in,
                                                  w = absolute humidity ratio, unitless. 	                      �    �	
                                                                                                               Vj = VL × CL       (3-43)                                     ft3/h-ft; and
                                                                                                                                                                       CL = total crack length, ft.
                                                    (g) Calculate the total crack length, CL,(ft), Where: 	                                                               (i) Calculate the total infiltration load due
                                                  using the architectural drawing of the walk-                                                                         to steady-state infiltration, (Qinfilt panel), Btu/h,
                                                                                                   j = index of type cooler or freezer;
                                                  in,                                                                                                                  as follows:



                                                                                                                     (                                 )     �
                                                                                                  Qinfilt panel = ρext , j × hext, j − ρ int, j × h int, j ×V1        (3-44)
                                                                                                                                                                                                                               EP09SE10.078</MATH><!--MATH SPAN=’’ DEEP=’’-->



                                                  Where: 	                                                 3.2.2 Door Steady-State Infiltration                        Where:
                                                  j = index of cooler or freezer temperature;              Calculations                                                   i = index of each unique door geometry and
                                                   ˙
                                                  Vj = the infiltration rate measured at test                 (a) Calculate the steady-state infiltration              temperature differential combination;
                                                         temperature j, per section 4.2, ft3/h;                                                 ˙
                                                                                                           associated with doors as follows, Vdoor
                       ni = number of identical doors of type i,
                                                  rint,j = internal air density, lb/ft3; 	                                                                             unitless; and

                                                                                                           steady,i /h:
                                                                                                                   3
                                                                                                                                                                        ˙
                                                                                                                                                                       Vdoor1Q = door steady state infiltration as
                                                  rext,j = external air density, lb/ft3;
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                                                                                             found following section 4.4.2, ft3/h.
                                                  hint,j = internal air enthalpy, Btu/lb; and 	                                      i
                                                                                                             �                  �
                                                                                                             Vdoor steady,i = ∑ Vdoori × ni                (3-45)         (b) Calculate the total infiltration load due
                                                                                                                                                                                                                               EP09SE10.077</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                  hext,j = external air enthalpy, Btu/lb.
                                                                                                                                                                       to steady-state infiltration through doors,
                                                                                                                                     1                                 Qdoor steady, btu/h, as follows:




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                                                  55102               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules




                                                                                                                                                                                                                                      EP09SE10.092</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                            i
                                                                                         Qdoor steady = ∑ ( ρext ,i × hext ,i − ρint,i × hint,i ) × Vdoor steady,i

                                                                                                                                                    �                             (3-46)
                                                                                                            1



                                                  Where:                                                        geometry, underlying materials,                              qo = 10 minutes and for freight doors qo = 20
                                                  i = index of type cooler or freezer                           function, and have the same temperature                      minutes.
                                                         temperature;                                           difference across the door;                                    (6) Daily time period: All walk-ins, qd = 24
                                                   ˙
                                                  Vdoor steady,i = total door steady-state                 P = number of doorway passages (i.e.,                             hours
                                                         infiltration, ft3/h;                                   number of door opening events);                                (b) Calculate the density factor, Fm, for
                                                  rint,i = internal air density, as found in 3.2.1                                                                           each door, as follows:




                                                                                                                                                                                                                                      EP09SE10.091</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                           qp = door open-close time, seconds per
                                                         above, lb/ft3;                                         opening P;
                                                  rext,i = external air density, as found in 3.2.1         qθ = time door stands open, minutes; and                                                          3/2
                                                         above, lb/ft3;                                                                                                                  ⎡                  ⎤
                                                                                                           qd = daily time period, h.
                                                  hint,i = internal air enthalpy, as found in 3.2.1                                                                                      ⎢                  ⎥
                                                         above, Btu/lb; and
                                                                                                             (1) Number of doorway passages: For                                         ⎢     2            ⎥
                                                  hext,i = external air enthalpy, as found in 3.2.1
                                                                                                           display glass doors, P = 72, for passage doors,                       Fm,i   =⎢              1/3
                                                                                                                                                                                                            ⎥          (3-48)
                                                         above, Btu/lb.                                    P = 60 and for freight doors, P = 120.                                        ⎢ ⎛ ρint,i    ⎞ ⎥
                                                                                                             (2) Door open-close time: For display glass                                 ⎢1+ ⎜         ⎟ ⎥
                                                  3.2.3 Door Opening Infiltration Calculations                                                                                               ⎜
                                                                                                                                                                                         ⎢ ⎝ ρext ,i   ⎟
                                                    (a) Calculate the portion of time each
                                                                                                           doors, qp = 8 seconds, for passage doors, qp
                                                                                                           = 15 and for freight doors, qp = 60.                                          ⎣             ⎠ ⎥  ⎦
                                                  doorway is open, Dt, unitless, as follows:                 (3) Door open-close time if an automatic                        Where:




                                                                                                                                                                                                                                      EP09SE10.090</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                           door opener/closer is used: For passage                           i = index for each unique door
                                                             (        )
                                                           ⎡ P × θp + ( 60× θθ ) ⎤                         doors, qp = 10 and for freight doors, qp = 30.                    rint,i = internal air density, of door type i,
                                                    Dt,i = ⎣                     ⎦           (3-47)          (4) Time door stands open: Display glass                               lb/ft3; and 

                                                                [3600× θd ]                                doors, qo = 0 minutes, for passage doors qo
                                                                                                           = 30 minutes and for freight doors qo = 60
                                                                                                                                                                             rext,i = external air density, of door type i,

                                                                                                                                                                                    lb/ft3.
                                                  Where:                                                   minutes.                                                             (c) Calculate the infiltration load for fully
                                                  i = index for each unique door—for example                 (5) Time door stands open if an automatic                       established flow through each door,
                                                       a unique door must be of the same                   door opener/closer is used: For passage doors                     qi (Btu/h), as follows:


                                                                                                                                                          /
                                                                                                                                                         1/2
                                                                                                                                          ⎛ ρext ,i     ⎞
                                                                                                       (                   )




                                                                                                                                                                                                                                      EP09SE10.089</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                                                                      1/2
                                                                                qi = 795.6× Ai × hext ,i − h int,i             × ρint,i × ⎜1−
                                                                                                                                          ⎜ ρint,i      ⎟ × ( g × Hi ) × Fm,i
                                                                                                                                                        ⎟
                                                                                                                                                                                           (3-49)
                                                                                                                                          ⎝             ⎠

                                                  Where:                                                      (d) Calculate the doorway infiltration                         j = index for each unique infiltration
                                                  i = index for each unique door;                          reduction device effectiveness, E (%), at the                          reduction device (IRD) of type i;
                                                  Ai = doorway area, of door type i, ft2;                  same test conditions as described in steady-                      Vrate,with-device i,j = air infiltration rate, with
                                                  hint,i = internal air enthalpy, of door type i,          state infiltration section, as follows:                                door open and reduction device active,
                                                         Btu/lb;                                              (1) Calculate the infiltration reduction                            4.3, 1/h, if a device j is not used with the
                                                  hext,i = external air enthalpy, of door type i,          effectiveness:                                                         doorway i, Vrate,with-device i,j =
                                                                                                                                                                                  Vrate,without-device i,j ; and




                                                                                                                                                                                                                                      EP09SE10.088</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                         Btu/lb;
                                                  rint,i = internal air density, of door type i, lb/                           Vrate,with-device i, j                        Vrate,without-device i,j = air infiltration rate, with
                                                         ft3;                                               Ei, j = 1 −                                            (3-50)         door open and reduction device disabled
                                                  rext,i = external air density, of door type i, lb/                       Vrate,without-device i, j                              or removed, using 4.3, 1/h.
                                                         ft3;                                                                                                                (e) Calculate the total door opening
                                                  Hi = doorway height, of door type i, ft;                 Where:                                                                 infiltration load for all door-IRD
                                                  Fm,i = density factor, of door type i, and               i = index for each unique doorway size of                              combinations, Qdoor open, (Btu/h), as
                                                  g = acceleration of gravity, 32.174 ft/sec.2.                 type small, medium or large;                                      follows:


                                                                                                                   i   j
                                                                                                 Qdoor open = ∑∑ qi × Dt ,i × Df × 1− Ei, j × ni (             )            (3-51)
                                                                                                                                                                                                                                      EP09SE10.087</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                  1    1


                                                  Where:                                                   ni = number of doorways of type i being                           Ei,j = effectiveness of doorway type i with IRD
                                                     i = index for each unique combination of                    considered in the calculation;                                    type j, as measured by gas tracer test, %.
                                                  doorway size, temperature difference and Dt,             qi = infiltration load for fully established
                                                  of type i—for example, if the walk-in has a                    flow, Btu/h;                                                3.3 Energy Consumption Due to Total Heat
                                                  small, medium and large door, i = 3, or if the           Dt,i = doorway open-time factor as calculated                     Gain
                                                  walk-in has ten identical dimensioned                          for each unique door way, unitless;                           (a) Calculate the total thermal load, Qtot,
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  display doors and one passage door all with              Df = doorway flow factor, 0.8 for freezers and                    (Btu/h), as follows:
                                                                                                                 coolers (from ASHRAE Fundamentals),
                                                                                                                                                                                                                                      EP09SE10.086</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                  the same temperature differential, i = 2;
                                                  j = index for the effectiveness of IRD type j;                 unitless;


                                                                                              Qtot = Q infilt pane l + Qdoor steady + Qdoor open +Qcond                       (3-52)




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                                                                         Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                               55103

                                                  Where:                                                    Qdoor open = total load due to door opening                    (c) Calculate the total daily energy
                                                  Qinfilt panel = total load due to steady-state                 infiltration, Btu/h.                                    consumption due to thermal load, Qtot,EER,
                                                        infiltration, Btu/h;                                  (b) Select Energy Efficiency Ratio (EER), as               (kWh/day), as follows:
                                                  Qcond = total load due to conduction, Btu/h;              follows:
                                                  Qdoor steady = total load due to door steady-               (1) For coolers, use EER = 12.4 Btu/Wh.
                                                        state infiltration, Btu/h; and                        (2) For freezers, use EER = 6.3 Btu/Wh.


                                                                                                                          Qtot   24 h ×1 kW
                                                                                                          Qtot ,EER =          ×                                (3-53)
                                                                                                                          EER 1 day ×1000 W




                                                                                                                                                                                                                                       EP09SE10.098</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                  Where:                                                      (1) For lights without timers, control                     control by door open or closed position for
                                                  Qtot = total thermal load, Btu/h; and                     system or other demand-based control,                        display doors, PTO=99.33 percent. With
                                                  EER= EER of walk-in (cooler or freezer),                  PTO=25 percent. For lighting with timers,                    control by door open or closed position for
                                                       Btu/Wh.                                              control system or other demand-based                         other doors, PTO=99.17 percent.
                                                                                                            control, PTO=50 percent.                                        (4) For all other electricity consuming
                                                  3.4 Energy Consumption Related to
                                                                                                              (2) For anti-sweat heaters on coolers (if                  devices: Without timers, control system, or
                                                  Electrical Components
                                                                                                            required): Without timers, control system or                 other auto-shut-off systems, PTO=0 percent.
                                                     Electrical components contained within a               other demand-based control, PTO=0 percent.
                                                  walk-in could include, but are not limited to:                                                                         If it can be demonstrated that the device is
                                                                                                            With timers, control system or other demand-
                                                  Heater wire (for anti-sweat or anti-freeze                                                                             controlled by preinstalled timers, control




                                                                                                                                                                                                                                       EP09SE10.097</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                            based control, PTO=75 percent. For anti-
                                                  application); lights (including display door                                                                           system or other auto-shut-off systems,
                                                                                                            sweat heaters on freezers (if required):
                                                  lighting systems); control system units; and              Without timers, control system or other auto-                PTO=25 percent.
                                                  sensors.                                                                                                                  (b) Calculate the power usage for each type
                                                                                                            shut-off systems, PTO=0 percent. With
                                                  3.4.1 Direct Energy Consumption of                        timers, control system or other demand-based                 of electricity consuming device, Pcomp,t,
                                                  Electrical Components                                     control, PTO=50 percent.                                     (kWh/day), as follows:
                                                     (a) Select the required value for percent                (3) For active infiltration reduction
                                                  time off for each type of electricity                     devices: Without control by door open or
                                                  consuming device, PTOt (%):                               closed position, PTO=25 percent. With


                                                                                                                                                              24h




                                                                                                                                                                                                                                       EP09SE10.096</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                   Pcomp,u , t = Pr ated ,u , t × (1− PTOu , t ) × nu , t ×          (3-54)
                                                                                                                                                              day


                                                  Where:                                                                         t                                                                   412 Btu
                                                  u = index for each type of electricity                           Ptot ,ext = ∑ Pcomp,ext , t         (3-56)              Cload = Ptot,int × 3.                         (3-57)
                                                        consuming device sited inside the walk-                                                                                                      EER Wh
                                                                                                                                1
                                                        in envelope and/or sited external the                                                                            Where:
                                                        walk-in envelope, inside, u=int, external,          Where:
                                                        u=ext;                                                                                                           EER = EER of walk-in (cooler=12.4 or
                                                                                                            t = index for each type of electricity
                                                  t = index for each type of electricity                                                                                       freezer=6.3), Btu/Wh; and




                                                                                                                                                                                                                                       EP09SE10.095</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                                 consuming device with identical rated
                                                        consuming device with identical rated                                                                            Ptot,int = The total electrical load due to
                                                                                                                 power;
                                                        power;                                                                                                                 components sited inside the walk-in
                                                                                                            Pcomp,int, t = the energy usage for an electricity
                                                  Prated,u,t = rated power of each component, of                                                                               envelope, kWh/day
                                                        type t, kW;                                              consuming device sited inside the walk-

                                                  PTOu,t = percent time off, for device of type                  in envelope, of type t, kWh/day; and                    3.5 Total Energy Consumption and 

                                                        t, %; and                                           Pcomp,ext, t = the energy usage for an electricity           Normalized Energy Consumption 

                                                  nu,t = number of devices at the rated power                    consuming device sited outside the 
                    3.5.1    Total Energy Consumption
                                                        of type t, unitless.                                     walk-in envelope, of type t, kWh/day.
                                                                                                                                                                           Calculate the total energy load of the walk-
                                                     (c) Calculate the total electrical energy              3.4.2 Total Indirect Electricity Consumption                 in envelope per unit of surface area and non-
                                                  consumption, Ptot, (kWh/day), as follows:                 Due to Electrical Devices
                                                                                                                                                                         normalized total energy consumption,

                                                                                                                                                                                                                                       EP09SE10.094</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                                                              (a) Calculate the additional compressor                    Etot,non-glass,norm, Etot,glass,norm, Etot,electrical,norm,
                                                                     t
                                                        Ptot,int = ∑ Pcomp,int, t
                                                                                                            load due to thermal output from electrical
                                                                                          (3-55)            components sited inside the envelope, Cload, 

                                                                                                                                                                         and Etot,(kWh/ft2/day), as follows: 

                                                                                                                                                                           (a) Etot,non-glass,norm, kWh/ft2/day,
                                                                    1                                       (kWh/day), as follows:


                                                                                                     ⎡      Anon-glass,tot         ⎤ ⎡         Qtot,EER            ⎤
                                                                                    Etot,non-glass = ⎢                             ⎥×⎢                             ⎥                 (3-58)
                                                                                                     ⎢ Anon-glass,tot + Aglass,tot ⎦ ⎣ Anon-glass,tot + Aglass,tot ⎦
                                                                                                     ⎣                             ⎥ ⎢                             ⎥
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                                                                                                                                                       EP09SE10.093</MATH><!--MATH SPAN=’’ DEEP=’’-->




                                                     (b) Etot,glass,norm, kWh/ft2/day,




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                                                  55104                 Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                                                                      ⎡        Aglass,tot           ⎤ ⎡         Qtot,EER
                                                                                                                                                    t               ⎤
                                                                                         Etot,glass = ⎢                             ⎥×⎢                             ⎥        (3-59)
                                                                                                      ⎢ Anon-glass,tot + Aglass,tot ⎥ ⎢ Anon-glass,tot + Aglass,tot ⎥
                                                                                                      ⎣                             ⎦ ⎣                             ⎦

                                                     (c) Etot,electrical,norm, kWh/ft2/day,


                                                                                                                                      Ptot + Cload
                                                                                                       E

                                                                                                        tot,electric device =                                     -
                                                                                                                                                                (3-60)
                                                                                                                                Anon-glass,tot + Aglass,tot


                                                     (d) Etot, kWh/day,                                      4.0 TEST METHODS AND                                   (i) Exception: Walk-in panels that utilize
                                                                                                             MEASUREMENTS                                              vacuum insulated panels (VIP) for
                                                    Etot = Qtot ,EER + Ptot + Cload             (3-61)       4.1 Conduction Performance Testing and                    insulation, X = 2’± 2’’. The wider tolerance
                                                                                                             Measurements                                              is meant to allow the cutting line, when
                                                  Where:                                                                                                               preparing the Panel Edge Test Region, to
                                                                                                             4.1.1 Measuring Panel and Floor U-factors
                                                     Qtot,EER = the total thermal load, kWh/day;                                                                       match the VIP junctions such that VIP will
                                                                                                             using ASTM C1363–05
                                                     Ptot = the total electrical load, kWh/day;                                                                        not lose vacuum by being pierced by the
                                                     Anon-glass,tot = total surface area of the non-            (a) Test Sample Geometry Requirements
                                                                                                                                                                       cutting device.
                                                                                                                (1) Two (2) panels, 8’ ± 1’’ long and 4’ wide
                                                  glass envelope, ft2;
                                                                                                             ± 1’’ must be prepared.                                   (4) Panel Core Test Region must also be cut
                                                     Aglass,tot = total surface area glass envelope,            (2) The panel edges must be joined using            from one of the two panels such that Y = 2’
                                                  ft2; and                                                   a given manufacturer’s panel interface                 ± 0.25’’ and Z = 7’ ± 0.5’’. (See Figure 3)
                                                     Cload = additional compressor load due to               joining system (i.e. camlocks).                        (i) Exception: As above, walk-in panels that
                                                  thermal output from electrical components                     (3) Panel Edge Test Region must be cut
                                                                                                                                                                       use VIP for insulation, Y = 2’± 2’’.
                                                  contained within the envelope, kWh/day.                    from the joined panels such that X = 2’ ±
                                                                                                             0.25’’ and Z = 7’ ± 0.5’’. (See Figure 3)




                                                                                                                                                                                                                      EP09SE10.206</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                                                                                                                                                                                      EP09SE10.101</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                                                                                                                                                                                      EP09SE10.100</GPH><!--GPH SPAN=’’ DEEP=’’-->




                                                     (b) Testing Conditions                                  ± 1 °F for the panels used for walk-in coolers            (c) Required Test Samples
                                                                                                             and ¥10 °F ± 1 °F for panels used for walk-
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                     (1) The air temperature on the ‘‘hot side’’                                                                       (1) Wall and Ceiling Panels
                                                  of the box should be maintained at 75 °F ±                 in freezers.                                           (i) Cooler conditions, Panel Edge Region
                                                  1 °F.                                                        (3) The air velocity should be maintained               U-factor: Unon-floor panel edge,cooler
                                                                                                                                                                                                                      EP09SE10.099</GPH><!--GPH SPAN=’’ DEEP=’’-->




                                                                                                             as natural convection conditions as described          (ii) Cooler conditions, Panel Core Region
                                                  (i) Exception: When testing floors, the air
                                                                                                             in ASTM C1363–05 (incorporated by                         U-factor: Unon-floor panel core,cooler
                                                     temperature should be maintained at 55 °F               reference, see § 431.303). The test must be            (iii) Freezer conditions, Panel Edge Region
                                                     ± 1 °F.                                                 completed using the masked method and                     U-factor: Unon-floor panel edge,freezer
                                                     (2) The temperature in the ‘‘cold side’’ of             with surround panel in place as described in           (iv) Freezer conditions, Panel Core Region
                                                  the envelope should be maintained at 35 °F                 ASTM C1363–05.                                            U-factor: Unon-floor panel core,freezer



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                                                                       Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                 55105

                                                     (2) Floor Panels                                     section 6.6.2.1 of ASTM C1303–10, in                     (e) The average convective heat transfer
                                                  (i) Cooler conditions, Floor Panel Edge                 reference to ASTM C518–04, the mean test              coefficient on both interior and exterior
                                                     Region U-factor: Ufloor panel edge,cooler            temperature of the foam during R-value                surfaces of the door should be based on
                                                  (ii) Cooler conditions, Floor Panel Core                measurement must be 20 +/¥ 4 °F (¥6.7                 ‘‘natural convection’’ as described in section
                                                     Region U-factor: Unon-floor panel core,cooler        +/¥ 2 °C) with a temperature difference of 40         4.3 of NFRC 100–2010–E0A1 (incorporated
                                                  (iii) Freezer conditions, Floor Panel Edge              +/¥ 4 °F (22 +/¥ 2 °C) for freezers and 55            by reference, see § 431.303).
                                                     Region U-factor: Ufloor panel edge,freezer           +/¥ 4 °F (12.8 +/¥ 2 °C) with a temperature
                                                  (iv) Freezer conditions, Floor Panel Core               difference of 40 +/¥ 4 °F (22 +/¥ 2 °C) for           4.2   Steady State Infiltration Testing
                                                     Region U-factor: Ufloor panel core,freezer           coolers.                                                 (a) Follow the test procedure in ASTM
                                                                                                             (5) Section 6.6.2.1, in reference to ASTM          E741–06 exactly, except for these changes
                                                  4.1.2 Measuring R–Value of Insulating                   C518–04, the mean test temperature of the
                                                  Foam                                                                                                          and exceptions to the procedure.
                                                                                                          foam during R-value measurement must be:
                                                                                                                                                                (incorporated by reference, see § 431.303):
                                                     (a) Follow the test procedure in ASTM                (i) For freezers: ¥6.7 +/¥ 2 °C (20 +/¥ 4 °F)            (1) Concentration decay method: The
                                                  C1303–10 exactly, with these exceptions                    with a temperature difference of 22
                                                  (incorporated by reference, see § 431.303):                                                                   ‘‘concentration decay method’’ must be used
                                                                                                             +/¥ 2 °C (40 +/¥ 4 °F)                             instead of other available options described
                                                     (1) Mold/Sample Panel Geometry                       (ii) For coolers: 12.8 +/¥ 2 °C (55 +/¥ 4 °F)
                                                                                                                                                                in ASTM E741–06.
                                                  (i) A panel must be prepared following                     with a temperature difference of 22
                                                                                                                                                                   (2) Gas Tracer: CO2 or SF6 must be used
                                                     typical manufacturer injection, curing and              +/¥ 2 °C (40 +/¥ 4 °F)
                                                                                                                                                                as the gas tracer for all testing.
                                                     assembly methods. The width and length                  (b) At least one sample set must be
                                                     of the panel must be 48 inches ± 1 inch and                                                                   (3) Air change rate: Measure the air change
                                                                                                          prepared, comprised of three stacks, while
                                                     96 inches ± 1 inch, respectively.                                                                          rate in 1/h, rather than the air change flow
                                                                                                          adhering to all preparation methods and
                                                  (ii) The panel thickness shall be equal to the                                                                described in ASTM E741–06 (incorporated
                                                                                                          uniformity specifications described in ASTM
                                                     desired test thickness.                              C1303–10 (incorporated by reference, see              by reference, see § 431.303).
                                                                                                          § 431.303).                                              (4) Spatial measurements: Spatial
                                                     (2) Materials
                                                                                                             (c) The value resulting LTTR for the foam          measurements must be taken in a minimum
                                                  (i) The panel materials should exactly mimic                                                                  of six locations or one location/20 ft2 of floor
                                                     a commercially viable panel; that is, the            shall be reported as Rfoam, but for the
                                                                                                          purposes of calculations in this test                 area (whichever results in a greater number
                                                     panel should be exactly identical to panels
                                                                                                          procedure calculations it will be converted to        of measurements) at a height of 3 ft +/¥ 0.5
                                                     sold by the manufacturer, with one key
                                                                                                          RLTTR, as follows:                                    ft, at a minimum distance of 2 ft +/¥ 0.5 ft
                                                     exception: The inner surfaces must be
                                                     lined with a material, such as 4 to 6 mil                                                                  from the walk-in walls or doors.
                                                     polyethylene film, to prevent the foam                         R LTTR = Rfoam            (4-1)                (b) The internal air temperature for freezers
                                                     from adhering to the panel internal                                                                        and for coolers shall be +/¥ 4 °F (2 °C) of the
                                                                                                          Where: 
                                              values shown in Table A.VI.1.
                                                     surfaces. (This ensures that when the panel          Rfoam = R-value of foam as measured by 

                                                     metal skin is removed for testing, the                                                                        (c) The external air temperature must be
                                                                                                               ASTM C1303–10, h-ft2¥°F/Btu.
                                                     underlying foam is not damaged).                                                                           75 °F (24 °C) +/¥ 5 °F (2.5 °C) surrounding
                                                                                                          4.1.3   U-Factor of Doors                             the walk-in.
                                                     (3) Sample Preparation
                                                                                                             (a) All doors must be tested using NFRC               (d) The test must be completed with the
                                                  (i) After the foam has cured and the panel is           100–2010–E0A1.                                        walk-in door closed.
                                                     ready to be tested, the facing and framing              (b) Internal conditions:                              (e) Number of tests:
                                                     materials must be carefully removed to                  (1) Air temperature of 35 °F (1.7 °C) for             (1) One unit must be tested at freezer
                                                     ensure that the underlying foam is not               cooler doors and ¥10 °F (¥23.3 °C) for                conditions with an insulated floor in place.
                                                     damaged or altered.                                  freezer doors.                                           (2) One unit must be tested at cooler
                                                  (ii) A 12-inch × 12-inch square (× desired                 (2) Mean inside radiant temperature same
                                                     thickness) cut from the exact geometric                                                                    conditions.
                                                                                                          as shown in (b)(1) above.                                (f) Geometry of standard walk-in test unit:
                                                     center of the panel must be used as the                 (c) External conditions
                                                     sample for completing ASTM C1303–10.                                                                          (1) External dimensions:
                                                                                                             (1) Air temperature of 75 °F (23.9 °C).
                                                     (4) Section 6.6.2, where several types of hot           (2) Mean outside radiant temperature same          (i) Width = 12 ft ± 6’’
                                                  plate methods are recommended, use ASTM                 as shown in (c)(1) above.                             (ii) Length = 18 ft ± 6’’
                                                  C518–04 (incorporated by reference, see                    (d) Direct solar irradiance = 0 W/m2               (iii) Height = 8 ft ± 6’’
                                                  § 431.303), for measuring the R-value. In               (0 Btu/h-ft2).                                           (2) Rectangular Shape (see Figure 4)
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                                                                                                                                                                                   EP09SE10.102</GPH><!--GPH SPAN=’’ DEEP=’’-->




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                                                  55106               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules




                                                                                                                                                                                                                      EP09SE10.107</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                                                                                                                                                                                      EP09SE10.106</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                     (g) Equipment Specifications                            (4) The standard unit internal volume must         Vref-space = the total enclosed volume of the
                                                     (1) One Passage Door (see Figure 4)                  be empty and unoccupied except for items                    walk-in, of the test unit shown in Figure
                                                  (i) Width = 36 inches ± 2 inches                        necessary for testing or for cooling the test               4, ft3; and
                                                  (ii) Height = 78 inches ± 4 inches                      unit (such as test equipment or evaporator            Vrate,cooler= the infiltration rate from the
                                                     (2) At freezer temperature, a pressure relief        fans).                                                      cooler test, 1/h
                                                  valve must be in-place and operational                     (i) Test Results                                   Vrate,freezer= the infiltration rate from the




                                                                                                                                                                                                                      EP09SE10.105</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                  during testing.                                            (1) At cooler conditions, the result                     cooler test, 1/h
                                                                                                          following ASTM E741–06, is:                              (2) Using the architectural drawing of the
                                                  (i) Valve flow rate > 8 cubic ft per minute @
                                                     1 inch of H2O (250 Pa))                              (i) First, correct the result to standard test        test unit, calculate total effective crack
                                                                                                             conditions per ASTM E 283.                         length, CL,wall, CL,door-wall, CL,ceiling-floor and
                                                     (3) Prescribed wall and ceiling panel
                                                                                                          (ii) The final and corrected infiltration rate,       CL,(ft), as follows:
                                                  geometry
                                                                                                             Vrate,cooler, (1/h)                                (i) CL,wall, ft:
                                                  (i) Wall panels
                                                  1. Width < 4 ft ± 1 inch                                   (2) At freezer conditions,
                                                  2. Height < 8 ft ± 1 inch                               (i) First, correct the result to standard test                       i
                                                  (ii) Ceiling panels
                                                  1. Width < 4 ft ± 1 inch
                                                                                                             conditions per ASTM E 283.
                                                                                                          (ii) The final and corrected infiltration rate,
                                                                                                                                                                                   (
                                                                                                                                                                   CL, wall = ∑ ⎡ H × Npanels,i ⎤
                                                                                                                                                                                ⎣               ⎦   )      (4-4)
                                                                                                                                                                               1




                                                                                                                                                                                                                      EP09SE10.104</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                     (h) Test Procedure Requirements                         Vrate,freezer, (1/h)
                                                                                                             (j) Calculations                                   Where:
                                                     (1) The unit must be assemble following
                                                  instructions provided in the standard panel                (1) Convert Vrate,freezer and Vrate,cooler to      i = index for walls from 1 to 3, i = 1: wall
                                                  manufacturer installation instructions that              ˙               ˙
                                                                                                          Vfreezer and, Vcooler, (ft3/h), as follows:                 of length 18′ and height 8′, i = 2: other
                                                  are normally provided with a shipped walk-                                                                          wall of length 18′ and height 8′ and i =
                                                  in.                                                      �
                                                                                                           Vfreezer = Vrate,freezer × Vref-space       (4-2)          3: wall opposite of the door of width 12′
                                                     (2) The unit may be tested only after it has                                                                     and height 8′;
                                                  reached a steady-state condition, normally                and                                                 H = height of the walk-in unit per Figure 4,
                                                  greater than 24 hours after the refrigeration                                                                       ft; and
                                                  system has been activated.                               �
                                                                                                           Vcooler = Vrate,cooler × Vref-space         (4-3)    Npanels,i = number of panels used to build wall
                                                                                                                                                                      of type i.
                                                                                                                                                                                                                      EP09SE10.103</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                     (3) The infiltration measurement period
                                                  must be over a duration greater than one hour           Where:                                                (ii) CL,door-wall, ft:


                                                                                                       CL,door-wall = H × ⎡ Npanels,door-wall − 2 ⎤
                                                                                                                          ⎣                       ⎦        (4-5)


                                                  Where:                                                  Npanels,door-wall = number of panels used to
jlentini on DSKJ8SOYB1PROD with PROPOSALS2




                                                  H = height of the walk-in unit per Figure 4,                  build the door wall
                                                      ft; and                                             (iii) CL,ceiling-floor, ft:
                                                                                                                                                                                                                      EP09SE10.207</GPH><!--GPH SPAN=’’ DEEP=’’-->




                                                                                             CL,ceiling-floor = W × ⎡ Npanels,ceiling −1⎤ + Pfloor + L × 2
                                                                                                                    ⎣                   ⎦                           (4-6)




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                                                                      Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules                                                       55107

                                                  Where:                                                  Npanels,ceiling = number of panels used to build      L = length of the walk-in unit per Figure 4,
                                                  W = width of the walk-in unit per Figure 4,                   the door wall, ft;                                   ft.
                                                      ft;                                                 Pfloor = external perimeter of the floor, ft; and     (iv) CL, ft:


                                                                                                     CL = CL,wall + CL,door-wall + CL,ceiling-floor          (4-7)


                                                  Where:                                                  (‘‘large test’’): Width = 144 inches ± 0.5 inch       (ii) Mean outside radiant temperature same
                                                  CL,wall = the total crack length of the non-door        and height = 180 inches ± 0.5 inch.                      as shown in (2)(i) above.
                                                        walls, ft;                                            (5) For the small door test, a test volume        (iii) Direct solar irradiance = 0 Btu/h-ft2
                                                  CL,door-wall = the total crack length of the door       of dimension and construction and door                   (0 W/m2).




                                                                                                                                                                                                                       EP09SE10.113</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                        wall, ft; and                                     location shown in Figure 4 must be used.              (iv) The average convective heat transfer
                                                  CL,ceiling-floor = the total crack length of the            (6) For all medium and large door tests, the         coefficient on both interior and exterior
                                                        ceiling and floor, ft;                            width and height of the test unit must be                surfaces of the door should be based on
                                                                                                          increased in size, directly proportional to the          ‘‘natural convection’’ as described in
                                                     (3) Calculate the infiltration per unit crack                                                                 section 4.3 of NFRC 100–2010–E0A1.
                                                                               ˙                          increased door size over the small door test.
                                                  length for the freezer, Vfreezer-ft and cooler,
                                                   ˙                                                      For example since the medium doorway                  4.4.2 Door Infiltration Testing
                                                  Vcooler-ft, tests, (ft3/h-ft), respectively as
                                                                                                          width is twice the size of the small door, the
                                                  follows:                                                                                                         (a) All doors must be tested using NFRC
                                                      ˙                                                   test unit must be twice as wide as shown in           400–2010–E0A1 (incorporated by reference,
                                                  (i) Vfreezer-ft, ft3/h-ft:                              Figure 4.                                             see § 431.303).
                                                                      V�                                  4.3.3   IRD Test Procedure Requirements                  (b) Number of tests:
                                                         �
                                                         Vfreezer-ft = freezer           (4-8)               (a) Use ASTM E741–06 (incorporated by                 (1) One door system of representative sizes




                                                                                                                                                                                                                       EP09SE10.112</MATH><!--MATH SPAN=’’ DEEP=’’-->
                                                                         CL                               reference, see § 431.303), with the following         of ‘‘small,’’ ‘‘medium,’’ and ‘‘large’’ as defined
                                                                                                                                                                in 4.3.2(a), that have identical construction
                                                                                                          exceptions to the procedure:
                                                  Where:                                                     (1) Within 3 minutes +/¥ 30 seconds of             (i.e. only differ in dimensional size) may be
                                                  CL = the total crack length of the test unit as         achieving gas concentration uniformity, with          used for extrapolating the infiltration of other
                                                        shown in Figure 4, ft; and                        the infiltration reduction device in place, a         doors that only differ in size as described in
                                                   ˙
                                                  Vfreezer-ft = infiltration rate from the freezer        hinged door should be opened at an angle              4.3.2(a).
                                                        test, ft3/h.                                                                                               (c) Testing must be completed at six
                                                                                                          greater than or equal to 90 degrees.
                                                       ˙                                                                                                        pressure differentials for both positive and
                                                  (ii) Vcooler-ft, ft3/h-ft:                                 (2) The elapsed time, from zero degrees
                                                                                                                                                                negative pressure (exfiltration and
                                                                                                          position (closed) to greater than or equal to
                                                                                                                                                                infiltration):
                                                                       V�                                 90 degrees (open) must be no longer than 5
                                                           �
                                                           Vcooler-ft = cooler          (4-9)             seconds.
                                                                                                                                                                   (1) 0.0401 in-H2O (10 Pa).
                                                                                                                                                                   (2) 0.0803 in-H2O (20 Pa).
                                                                          CL




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                                                                                                             (3) The door must then be held at an angle
                                                                                                                                                                   (3) 0.1204 in-H2O (30 Pa).
                                                                                                          greater than or equal to 90 degrees for 5 min
                                                  Where:                                                                                                           (4) 0.1606 in-H2O (40 Pa).
                                                                                                          +/¥ 5 seconds and then closed over a period
                                                  CL = the total crack length of the test unit as                                                                  (5) 0.2007 in-H2O (50 Pa).
                                                                                                          no longer than 5 seconds. For non-hinged
                                                       shown in Figure 4, ft; and                                                                                  (6) 0.2409 in-H2O (60 Pa).
                                                                                                          doors, the door must reach its maximum
                                                  ˙
                                                  Vcooler = infiltration rate from the cooler test,                                                                (d) At each of the six pressure differentials
                                                                                                          opened position, be held open, and reach a
                                                       ft3/h.                                                                                                   described above, the airflow rate must be
                                                                                                          fully closed position in the same elapsed             measured.
                                                  4.3 IRD Effectiveness Testing                           time as described above for hinge-type doors.            (e) Using the six pressure differentials and
                                                                                                             (4) The gas concentration must be sampled          measured flow rates (in both directions) the
                                                  4.3.1 IRD Test Alternatives                             again after the door has been closed. Samples         values for Ci and ni, must be found using log-
                                                    (a) The following IRD effectiveness                   should continue being taken until the gas             linear regression equation below:
                                                  assumptions may be used:




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                                                                                                          concentration is once again uniform spatially
                                                    (1) Strip Curtains Effectiveness: E = 0.5             within the walk-in.
                                                    (2) Air Curtains Effectiveness: E = 0.3                  (5) A gas concentration sample set must be                   �
                                                                                                                                                                          Vdoor = Ci (ΔP)ni               (4-10)
                                                    (b) If an IRD is tested and found to have             taken once the tracer gas has uniformly
                                                                                                                                                                Where:
                                                  a higher performing effectiveness than the              dispersed in the internal space using the
                                                  default values proposed above, that value               methodology described in 4.2.                         i = index corresponding to the exfiltration or
                                                  may be used in the energy calculations.                                                                             infiltration test;
                                                                                                          (i) Following ASTM E741–06, the calculated             ˙
                                                    (c) All non-strip curtain and non-air                                                                       VdoorQ = the airflow rate, ft3/h (m3/s);
                                                                                                             result is Vrate,with-device i,j
                                                  curtain IRD’s must be tested following the                                                                    DP = the differential pressure, in-H2O (Pa);
                                                                                                             (6) The test should be repeated exactly as         Ci = coefficient determined based on
                                                  test procedure below.
                                                                                                          described with the infiltration reduction                   goodness of fit to test data of type i; and
                                                  4.3.2 Doorway Testing Geometry                          device (IRD) removed or deactivated.                  ni = exponent determined based on goodness
                                                    (a) IRD effectiveness tests must use the                                                                                                                           EP09SE10.109</GPH><!--GPH SPAN=’’ DEEP=’’-->
                                                                                                          (i) Following ASTM E741–06, the calculated                  of fit to test data of type i.
                                                  following door sizes:                                      result is Vrate,without-device i,j                    (f) Find the average C and n:
                                                    (1) The testing must be completed for each
                                                  device at the correct representative size for           4.4 NFRC Door Testing
                                                                                                                                                                          Cinfiltration + Cexfiltration
                                                  small, medium and/or large doorways.                    4.4.1 Door Conduction Testing                              C=                                       (4-11)
                                                    (2) For doors with width ≤ 48 inches and                 (a) All doors, as defined in section 2.1(b),                               2
                                                  height ≤ 84 inches, the small door test                 must be tested using NFRC 100–2010–E0A1
                                                  opening size may be used (‘‘small test’’):              (incorporated by reference, see § 431.303).
                                                  width = 48 inches ± 0.5 inch and height =
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                                                                                                             (1) Internal conditions:
                                                  84 inches ± 0.5 inch                                                                                                    ninfiltration + nexfiltration
                                                    (3) For doors with width ≤ 96 inches and              (i) Air temperature of 35 °F (1.7 °C) for cooler           n=                                       (4-12)
                                                                                                                                                                                        2
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                                                                                                             doors and ¥10 °F (¥23.3 °C) for freezer
                                                  height ≤ 144 inches, the medium door test
                                                                                                             doors.                                             Where:
                                                  opening size may be used (‘‘medium test’’):
                                                                                                          (ii) Mean inside radiant temperature same as
                                                  width = 96 inches ± 0.5 inch and height =                                                                     Cinfiltration = coefficient determined using log-
                                                                                                             shown in (1)(i) above.
                                                  144 inches ± 0.5 inch                                                                                               linear regression of infiltration test;
                                                    (4) For doors of any width or height, the                (2) External conditions.                           Cexfiltration = coefficient determined using log-
                                                  large door test opening size may be used                (i) Air temperature of 75 °F (23.9 °C).                     linear regression of exfiltration test;



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                                                  55108               Federal Register / Vol. 75, No. 174 / Thursday, September 9, 2010 / Proposed Rules

                                                  ninfiltration = exponent determined using log-                    �
                                                                                                                    Vdoor = C(ΔP)n           (4-13)                                   �
                                                                                                                                                                                      Vdoor
                                                        linear regression of infiltration test; and                                                                  �
                                                                                                                                                                     Vdoor norm =                    (4-14)
                                                  nexfiltration = exponent determined using log-          Where:                                                                    Pdoor crack
                                                        linear regression of exfiltration test.            ˙
                                                                                                          VdoorQ = the airflow rate, ft3/h (m3/s);              Where: 

                                                     (g) If n is found to be less than 0.5 or             DP = the differential pressure, in-H2O (Pa);           ˙
                                                                                                                                                                VdoorQ = the airflow rate, ft3/h (m3/s); and 

                                                  greater than 1.0 the test is considered invalid         C = coefficient determined based on                   Pdoor crack = door operable crack perimeter, ft. 

                                                  and the infiltration and exfiltration tests must              goodness of fit; and                                   ˙
                                                                                                                                                                   (j) Vdoor normQ, for the corresponding
                                                  be repeated until valid value for n is                  n = exponent determined based on goodness             representative door test size, may be used for
                                                  determined.                                                   of fit.                                         calculating the infiltration rate of doors with
                                                     (h) Using the valid n, corresponding C and                                      ˙
                                                                                                             (i) Using the resulting VdoorQ for coolers         differing operable crack perimeter.
                                                                                      ˙
                                                  the equation below, determine,VdoorQ, the                                                                                                              ˙
                                                                                                                                                                   (k) If a testing entity desires such, VdoorQ
                                                                                                          and freezers, calculate the normalized
                                                  infiltration for the corresponding pressure             infiltration rate per length of ‘‘operable crack      may be found for all doors instead of
                                                  differentials (m3/s) for both cooler and                              ˙
                                                                                                          perimeter,’’ Vdoor normQ, as defined in ASTM          calculating an infiltration rate based on
                                                  freezer application:                                                                                           ˙
                                                                                                                                                                Vdoor normQ.
                                                                                                          E–283–04 (ASTM E–283–04 section 12.3.1)
                                                     (1) Coolers: 0.006 in-H2O (1.5 Pa).                  (incorporated by reference, see § 431.303)            [FR Doc. 2010–21364 Filed 9–8–10; 8:45 am]
                                                     (2) Freezers: 0.014 in-H2O (3.5 Pa).                 must be calculated.                                   BILLING CODE 6450–01–P




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