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					           Steven Winter Associates, Inc                                           307 Seventh Avenue Suite 1201
           Building Systems Consultants                                            New York, NY 10001




BTU/Sq Ft/HDD Calculator
Beta test version 1.0

DISCLAIMERS
1. This Calculator is currently in draft form and has been provided to you for testing purposes only.
2. The calculator, its calculations and content are the sole property of Steven Winter Associates, Inc. (SWA) and
may not be copied or re-used without written permission.
3. The Beta test version 1.0 has a margin of error that fluctuates based on the amount of data entered. Users are
cautioned about providing more or less than a year's worh of fuel usage.
4. SWA makes no gaurantee that the calculations in the Beta Test version 1.0 are accurate. These calculations
are meant to demonstrate approximate energy performance and do not substitute for technical consulting
services.
5. Heating Degree day information is averaged over a period of years and is based on data from publically
available weather sources. Future versions of this calculator will match actual annual HDD information to the year
of fuel record input.
6. Any questions about the Calculator, its purpose, intended use and development schedule should be addressed
to: Cecily Channell, Steven Winter Associates, Inc. (212) 564-5800 ext 13.

INSTRUCTIONS FOR USE
General Instructions
1. Select the calculator tab below to access the calculator.
2. Follow directions in Blue text - input data only in YELLOW highlighted areas.
3. Green highlighted areas are calculations based on your inputs.
4. Print the calculator using the print commands in excel - results are pre-formatted to print on one page.

Step by Step Instructions
1. Enter the building or project name
2. Select the type of fuel your building uses. The Beta test version 1.0 calculator only accepts natural gas and #2,
#4 and #6 oil.
3. Specify the start and end of the heating season for this building. The calculator must recognize these inputs as
DATES.
4. Collect fuel records for the year 2005. This should include the last date of oil delivery/gas reading in 2004.

4. Input reading or period dates and fuel usage starting in row 1. The first reading date will be the last date in
2004. Enter records for one year only (or as close as possible) and include CONSECUTIVE READINGS only.
Enteringthe building area MORE THAN one year of records will impact calculation results and will result in a
5. Input LESS THAN or (square feet)
6. Select a region from the drop down list to access annual Heating Degree Day information. The Beta test
version 1.0 has several options, choose the city that is closest to your area in climate.
7. The calculator will determine annual fuel usage for Domestic Hot Water (DHW) and Heating. It will also
determine the BTU/Sq FT/HDD.

Technical support
Contact Cecily Channell, Steven Winter Associates, Inc. at: channell@swinter.com, (212) 564-5800 ext 13
                                 Multifamily Building Energy Usage Calculator (BTU/Sq-FT/HDD)
   Instructions: Enter information into yellow fields (following directions in blue text. Do not alter any white or gray cells.)

   Building Name/Address                                                                               305-315 East 88th Street NYC

                                                                       Input Fuel Type and Usage Information

   1. Select a fuel type from the list below                           #6 Oil
                                          Fuel Type Units             Gallons

   2. Indicate Start & End of Heating Season
                                                        Start          1-Oct         The heating season in the New York City area starts on October 1st and ends on May 31st.
                                                         End          31-May

   3. Input One Year Of Fuel Records
   Input delivery/reading dates and fuel usage starting in row 1. The first PERIOD START will be the last date in 2004. Enter records for one year only (or as close
   as possible) and include CONSECUTIVE READINGS only. Entering LESS THAN or MORE THAN one year of records will impact calculation results and will result
   in a greater margin of error.
                                                             #     Reading Start     Delivery/Reading Usage (Gallons) Service Provided                             # of days   Gallons/Day
                                                             1       1/1/2005           1/31/2005             8,166     Heat and Domestic Hot Water                    31              263
                                                             2       2/1/2005           2/28/2005             8,772     Heat and Domestic Hot Water                    28              313
                                                             3       3/1/2005           3/31/2005             5,349     Heat and Domestic Hot Water                    31              173
                                                             4       4/1/2005           4/30/2005             2,456     Heat and Domestic Hot Water                    30               82
                                                             5       5/1/2005           5/31/2005             2,440     Heat and Domestic Hot Water                    31               79
                                                             6       6/1/2005           6/30/2005             2,446       Domestic Hot Water Only                      30               82
                                                             7       7/1/2005           9/30/2005             2,443       Domestic Hot Water Only                      92               27
                                                             8      10/1/2005          10/31/2005             2,415     Heat and Domestic Hot Water                    31               78
                                                             9      11/1/2005          11/30/2005             2,166     Heat and Domestic Hot Water                    30               72
                                                            10      12/1/2005          12/31/2005             2,829     Heat and Domestic Hot Water                    31               91
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                                                                    Total Reported Usage (1.00 years)              39,481                                              365               108




                                                                 Calculated Fuel Usage for Domestic Hot Water (DHW)

                       Total DHW Only Fuel Usage (Gallons)                  4,889 Note: If you do not show any DHW Only fuel usage, change the Heating Season dates (in
                                     Total DHW Only Days                       122 question 3) to include summer usage recorded in step 3.

                  Reported Fuel Usage - DHW (Gallons/Day)                    40.08

                               Annualized Fuel Usage - DHW                 14,628                               37%         Percentage of Fuel to Make Hot Water


                                                                                Calculated Heating Usage

                            Total Reported Usage (1.00 years)              39,481
                                                 (# of Years)                1.00

                                           Annualized Usage                39,481

                               Less Annual DHW Only Usage                 (14,628)

                                       Annual Heating Usage                24,853


                                                        Calculated BTU per Square Foot Per Heating Degree Day (HDD)

                              Annual Heating Usage (Gallons)               24,853

                            Conversion Factor (BTUs/Gallons)              155,000

                            Annual Heating Usage (MMBTUs)                   3,852

   4. Input The Total Building Area (sq-ft)                                73,878

                                      BTU's Per Square Foot                52,144

   5. Select a Region                                                New York
                           Annual Heating Degree Days (HDD)                4,804                                Definition: A degree day gauges the amount of heating or cooling
                                                                                                                            needed for a building using 65 degrees as a baseline. To
                                                                                                                            calculate a Heating Degree Day, subtract the daily
                                                                                                                            temperature from 65.




                   Efficiency Rating :                           Your building is within the average for this area. You could lower this number by implementing basic energy
                                                                 improvements.
                            10.85
                      BTU / Sq-Ft / HDD                            BTU/Sq-Ft/HDD     BTU/Sq-Ft/HDD Scoring Category
                                                                       0 - 4.99      There must be a problem. Make sure you have ALL fuel accounts and accurate building data.
                                                                       5 - 8.99      Congratulations! Your building is a high performance building!
                                                                      9 - 17.99      Your building is within the average. You could lower this number with basic energy improvements.
                                                                     18 - 29.99      Your building is a high energy user. Consider energy efficient building improvements.
                                                                         30 +        There must be a problem. Make sure you have accurate fuel accounts and building data.




11/22/2011                                                                               Prepared by Steven Winter Associates, Inc.                                                     d24d1f71-fdc9-46e8-9a42-81a0e4d5f8e8.xlsx

				
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posted:11/23/2011
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