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Auraria Higher Education Center Case Study by hzp22842

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									Auraria Higher Education Center
          Case Study

    John Ismert & Frank Ellis
  Auraria Higher Education Center
      Facilities Management
Auraria Higher Education Center


                 • Built in 1976-77
                 • 18 campus buildings
                 • 1,700,000 square feet of
                   office and classroom space
 Auraria Higher Education Center
           Project Scenario

• Campus built 20 years ago
• Fast-track construction project
• All the equipment is beginning to
  wear out at once
• Energy efficient systems have
  progressed a lot in 20 years
• Time for some major retrofit work
Auraria Higher Education Center
       Main Cooling Plants

               • North Classroom Chiller
                 Plant
               • P.E. Building Chiller Plant
               • Plaza Building Chiller
                 Plant
               • North Chiller Plant
                  – serves Science, Arts and
                    Library buildings
               • South Chiller Plant
                  – serves Central, West, South,
                    and Technology buildings
       Auraria Higher Education Center
           Heating & Hot Water System

• Purchased steam from Public Service Company
  in Denver for heating
• Hot water generated from heat exchange with
  steam system
• Typical of late 1970s with escalating gas prices
• Studied replacement options but decided to
  keep steam system
  – would have needed 60+ gas boilers
  – able to negotiate lower steam cost
                                                           Auraria Higher Education Center
                                                                Electricity Use in North Chiller Plant
                                                                                        u
                                                                        co ol in g con s mpti on         no n-coo li ng consumpti on
                                     20 0

                                     18 0


                                                                                                                                       • Monthly cooling
                                     16 0
     Energy Consumption (1000 kWH)




                                     14 0

                                     12 0

                                     10 0
                                                                                                                                         and non-cooling
                                       80

                                       60
                                                                                                                                         electricity
                                       40
                                       20
                                                                                                                                         consumption
                                        0                                                                                                1995
                                                   Feb




                                                                                                         Sep




                                                                                                                                Dec
                                             Jan




                                                                                 Jun




                                                                                                   Aug
                                                                        May




                                                                                                                         Nov
                                                                                                                 Oct
                                                                                         Jul
                                                          Mar


                                                                 Apr




                                     10 00
                                      90 0

                                      80 0
                                      70 0
                                                                                                                                       • Monthly
Demand (KW)




                                      60 0
                                      50 0

                                      40 0
                                                                                                                                         electricity
                                      30 0

                                      20 0
                                                                                                                                         demand 1995
                                      10 0

                                         0
                                                    Feb




                                                                                                          Sep




                                                                                                                                 Dec
                                                                                                   Aug




                                                                                                                  Oct


                                                                                                                         Nov
                                             Jan




                                                                                  Jun
                                                                  Apr




                                                                                         Jul
                                                                         May
                                                          Mar
 Auraria Higher Education Center
          Project Challenges

• More work than can be done under
  the budget available
• Must fit into a 10 year self-funded
  project
• Coordination of systems between
  all campus buildings
• Need to restore cooling capabilities
  before the summer of 1997
    Auraria Higher Education Center
        Campus Improvements Made


• New efficient chillers and cooling tower in
  North Chiller Plant
• New direct digital controls in 7 buildings
• Air side improvements in many buildings
• Lighting improvements
• Fume hood efficiency improvements
   Auraria Higher Education Center
             North Chiller Plant

• Original Chillers
  – Two 550 ton centrifugal electric chillers
  – R-12 refrigerant (CFC)
  – 0.78 kW/ton efficiency
• New Chillers
  – Two 550 ton centrifugal electric chillers
  – R-134a refrigerant (HFC)
  – 0.48 kW/ton efficiency
• Undersized cooling tower replaced
  – single-cell, induced draft tower
Auraria Higher Education Center
North Chiller Plant Energy Savings
      Auraria Higher Education Center
               Direct Digital Controls

• Added to 7 campus buildings
• New fiber optic network
• More aggressive energy conservation strategies
  – tighten chilled water and hot water resets
  – tighter run times
  – changed evaporative cooling & chilled water
    sequencing
• Monitored water meters for sprinklers & cooling
  towers for more accurate sewer credit
         Auraria Higher Education Center
                 Air Side Improvements

• Science building
  –   2 new air handling units
  –   new coils on 4 old air handling units
  –   new VFD drives and motors for supply air fans
  –   replaced variable air volume boxes
• Art building
  – replaced evaporative cooler media
• PE building
  – failing heat storage wheel replaced with heat exchanger
  Auraria Higher Education Center
         Lighting Improvements

• High efficiency T-8 lamps
• Rapid start electronic ballasts
• Compact fluoruescents in place of
  incandescents
• Exit lamps replaced with long life lamps
• 10,682 fixtures modified in 13 buildings
• Light levels maintained or improved
    Auraria Higher Education Center
          Fume Hood Improvements

• Over 50 fume hoods retrofitted
  – North Classroom and Science buildings
• Proximity sensors installed and attached
  to 2-position dampers
  – reduce air flow from 100 fpm to 60 fpm at night
    or when no one is near the hoods
• Integrated operation of building make-up
  and exhaust air and fume hood ventilation
       Auraria Higher Education Center
                 Estimated Project Finances
                      Purchase &      Rebates and      Annual       Payback
                      Installation       Credit        Energy        Period
                         Cost         Deductions       Savings       (years)
   North Chiller &      549,700      63,000 rebate      25,600         17.6
   Cooling Tower                      35,000 R-12
    Direct Digital      577,500            ---          49,400        8.3
      Controls                                       20,000 sewer
       Air Side         74,000          17,000          13,900        4.1
    Improvements
      Lighting          590,800      86,000 rebate     142,000        3.3
    Improvements                      40,000 ICP
     Fume Hoods         279,800          9,000          52,400        5.2

         Total         2,071,800       250,000         303,300        6.0
   Service Contract        ---           ---           - 49,300       7.2


• Other improvements help pay for chiller plant work
      Auraria Higher Education Center
          Financing Structure of Project

•   Ten year bond from AHEC
•   $2 million worth of improvements
•   $175,000 demand side management rebates
•   $40,000 ICP grant, $35,000 R-12 credit
•   Annual utility savings of ~ $300,000
•   7.2 year overall project payback period with
    performance contracting service provided
Auraria Higher Education Center
        Project Timeline
        Auraria Higher Education Center
                   Project Results


•   Utility savings of about $300,000 annually
•   Took advantage of DSM rebate programs
•   More comfortable learning environment
•   Increased energy awareness level at AHEC
•   Newer, more efficient state-of-the-art systems
•   Reduced dependence on CFC’s

								
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