COMPARISON OF STANDARD-, AND IECC CODES FOR LARGE OFFICE BUILDINGS IN TEXAS Jaya Mukhopadhyay Juan-Carlos Baltazar, Ph.D. Hyojin Kim, Jeff S. Haberl, Ph.D., P.E., Cyndi Lewis, Bahman Yazdani, P.E. Energy Systems Laboratory Texas A&M University 20 th October 2011 New York Energy Systems Laboratory Texas A&M University System October 2011
STRUCTURE BACKGROUND METHODOLOGY CLIMATE ZONE DECRIPTION BASE CASE DESCRIPTION RESULTS SUMMARY 2/30
BACKGROUND Codes compared: - - -2004-2007 IECC -2010 - The purpose is to assess the stringency of each code - selected as the base-case 3/30
METHODOLOGY Performance option outlined in the codes used to design the base case DOE-2.1e used for simulations Analysis conducted for Site energy usage Source energy usage 4/30
CLIMATE ZONES Three counties selected for analysis Each county represents a climate zone Harris (Climate Zone 2A) Tarrant (Climate Zone 3A) Potter (Climate Zone 4B) POTTER TARRANT HARRIS The counties cover the major population hubs in the state 5/30
BASE-CASE The input was categorized into the following categories: Program Form Fabric Equipment FRACTION OF OCCUPANCY 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 FRACTION OF OCCUPANCY 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 0.1 HOUR OF DAY 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 HOUR OF DAY 6/30
BASE-CASE: Program Operating Schedules Schedules include: Occupancy Infiltration Service hot water demand Lighting Equipment HVAC system & fan - used as reference Assumed same for all codes, except -2010 equipment schedules modified to reflect 50% of receptacle outlets switched off when not in use FRACTION OF OCCUPANCY 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 FRACTION OF POWER FRAC. OF WATER USAGE 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 HOUR OF DAY 1 0.9 LIGHTING & EQUIPMENT 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 HOUR OF DAY 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 OCCUPANCY SHW USAGE 0.2 0.1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 HOUR OF DAY 7/30
BASE-CASE: Program Space Temperatures 70 F for space heating 75 F for space cooling Thermostat setback of 5 F Ventilation Requirements Peak occupancy: 275 sq.ft. / person 62.1 used to calculate the ventilation requirements Energy Code Ver. of 62.1 cfm/per. cfm/sqft Resultant OA cfm - 1981 5-1625 - 20-6500 -2004 20-6500 -2007 2004 5 0.06 6983-2010 2007 5 0.06 6983 IECC 2007 5 0.06 6983-2007 5 0.06 6983 + 8/30
BASE-CASE: Form Six story office building: Footprint area: 14,884 sq.ft. Total floor area: 89,304 sq.ft. Floor to floor height: 13 ft. Floor to ceiling height: 9 ft. Window to wall area ratio: 40% No shading except - (PF for South: 0.50) Aspect ratio: For -: 2.5:1 For other models: 1.5:1 Four perimeter zones & core zone for each floor: 15 ft. deep 9/30
BASE-CASE: Fabric Infiltration - requires 0.038 cfm/sq.ft. No specifications for whole building infiltration in -, 2004, 2007 or IECC Air-barriers mandatory in the -2010 & - Air Change method used When HVAC system ON, infiltration reduced by 75% Energy Code - 2007 & IECC Operating Hours ACH Non-Operating Hours ACH Core Zones 0.043 0.170 Perimeter Zones 0.070 0.280-2010 & - Core Zones 0.0095 0.0375 Perimeter Zones 0.0155 0.0618 10/30
BASE-CASE: Fabric Building Envelope Characteristics Steel frame walls Roof insulation entirely above metal deck Slab-on-grade for the floor Increase in Stringency Climate Zone 2007 IECC 2010 Steel Frame Walls 2A R-6.5 R-13 R-13 R-13 R-13 R-13+R-5 c.i 3A R-6.5 R-13 R-13+R3.8 c.i R-13+R3.8 c.i R-13+R3.8 c.i R-13+R-5 c.i 4B R-16.5 R-13 R-13+R7.5c.i R-13+R7.5c.i R-13+R7.5c.i R-13+R10 c.i Insulation Entirely Above Roof 2A R-13.5 c.i R-15 c.i R-20 c.i R-20 c.i R-20 c.i R-25 c.i 3A R-15.75 c.i R-15 c.i R-20 c.i R-20 c.i R-20 c.i R-25 c.i 4B R-15.5 c.i R-15 c.i R-20 c.i R-20 c.i R-20 c.i R-25 c.i Metal Frame Window U-Value 2A U-1.15 U-1.22 U-0.75 U-0.75 U-0.75 U-0.75 3A U-1.15 U-1.22 U-0.65 U-0.65 U-0.65 U-0.65 4B U-0.81 U-0.46 U-0.55 U-0.55 U-0.55 U-0.45 Window SHGC 2A 0.61 0.17 0.25 0.25 0.25 0.25 3A 0.61 0.15 0.25 0.25 0.25 0.25 4B 0.61 0.25 0.40 0.40 0.40 0.40 Slab On Grade 2A N.R N.R N.R N.R N.R N.R 3A N.R N.R N.R N.R N.R N.R 4B N.R N.R N.R N.R N.R R-10 at 4ft. 11/30
BASE-CASE: Fabric Roof & Wall Absorptance Energy Code Roof / Wall Absorptance - - -2004-2007 0.7 / 0.7 IECC 0.75 / 0.75-2010 CZ 2&3: 0.45 / 0.7 CZ 4 : 0.7 / 0.7-0.55 / 0.7 Roof & Wall Emittance Energy Code Roof / Wall Emittance - - 0.9 / 0.9-2004 -2007 IECC 0.75 / 0.75-2010 0.9 / 0.9-12/30
BASE-CASE: Equipment Lighting Systems Daylight diming controls assumed for -2010 and codes Energy Code Plug Loads Lighting Power Density (W/sq.ft.) - 1.57-1.3-2004 1-2007 1 IECC 1-2010 0.9-0.9 0.75 W/ sq.ft. assumed across all the codes 13/30
BASE-CASE: Equipment HVAC Systems - Office building > 75,000sqft or > 3 floors SYSTEM 5 Specifications for SYSTEM 5 Built-up VAV w/ reheat Supply fan static pressure 4 in. w.c. Total fan efficiency 55% Fan control Variable speed drive Cooling Chiller Heating Hot water boiler 14/30
BASE-CASE: Equipment HVAC Systems -, 2004, 2007, 2010 & IECC Water Fossil Fuel System 2 Specifications for SYSTEM 2 Built-up VAV w/ reheat Fan control Variable speed drive Cooling Chiller Heating Hot water boiler 15/30
BASE-CASE: Equipment HVAC Systems - Office building > 75,000sqft or > 3 floors SYSTEM 7 System 7 Specifications for SYSTEM 7 VAV with perimeter reheat Supply fan control VAV Cooling system Chilled water Heating system Hot water fossil fuel boiler 16/30
Select base-case system Start RUN 1 From SVA report pick up: Cooling capacity Fan electricity usage To decide economizer and type of fan Climate zone2a,3a,4b Pick SS-P output report Pick PV-A output report From PV-A report Pick up size of equipment to decide number of chillers and boilers: - HW-BOILER -HERM-CENT-CHILLER Pick SV-A output report To select type of fan Table 11.3.2A Budget System Descriptions, Note 4 To select economizer Table 6.3.1 Minimum System Size for which an Economizer is Required Power > 25 HP? No Fan control: Inlet vane Calculation of chiller size Btu/hr/12000 = tons Calculation of boiler size Btu/hr Yes Fan control type: Variable speed drive Table 11.4.3B Number of chillers Table 11.4.3A, Budget System Descriptions, Note 6 Chiller size >300 tons? No # of chillers = 1 Boiler size >600 kbtu/hr? No # of boilers = 1 Yes Yes Chiller size >600 tons? No # of chillers = 2 # of boilers = 2 Yes # of chillers 2 800tons From SS-P report Pick up size of SHW-heater to decide efficiency of SHW Select SHW efficiency according to size. Table 7.2.2 Performance Requirements for Water Heating Equipment Select chiller type according to size of each chiller. Table 11.4.3C Water chillers types Select chiller efficiency according to size of each chiller. Table 6.2.1C Water Chilling Packages - Minimum Efficiency Requirements Select boiler efficiency according to size. Table 6.2.1F Gas and Oil-Fired Boilers, Minimum Efficiency Requirements RUN 2 STOP
BASE-CASE: Equipment Chillers & Boilers Increase in Stringency Climate Zone Chiller Type and Specifications 2007 IECC 2010 2A 3A Recip. COP 3.8 Recip. COP 3.8 Screw COP 4.45 Screw COP 4.45 Screw COP 4.45 Screw COP 4.45 Screw COP 4.54 Recip. COP 4.54 Screw COP: 4.54 Recip. COP: 4.54 Screw COP: 4.54 Screw COP: 4.54 4B Recip. COP 3.8 Screw COP 4.45 Screw COP 4.45 Recip. COP 4.54 Recip. COP: 4.54 Screw COP: 4.54 Gas Boiler Type and Specifications (Et % ) 2A 3A 4B 80 % Number: 2 80 % Number: 2 80 % Number: 2 75 % Number: 2 80 % Number: 2 89 % 18/30
BASE-CASE: Equipment Economizers Requirements for implementing economizers more stringent with newer versions of the codes Trade-offs are provided in some codes by increasing cooling efficiency Climate Zone 2004 2007 2A 3A 4B (Note 1) Min. Size of System Diff. Drybulb 65 kbtu/hr Fixed Drybulb 65 kbtu/hr Table 6.3.1 Fixed Drybulb 65 kbtu/hr Table 6.5.1 Diff. Drybulb 65 kbtu/hr Table 6.5.1 IECC Diff. Enthalpy Trade-off: 15% Diff. Drybulb 54 kbtu/hr Table 503.3.1(2) 2010 Diff. Enthalpy Trade-off: 17% Diff. Enthalpy Trade-off: 27% Diff. Drybulb 54 kbtu/hr Table 6.5.1A Diff. Enthalpy Trade-off: 15% Diff. Drybulb 33 kbtu/hr Table 7.4.3.4A 19/30
BASE-CASE: Equipment Service Hot Water Gas fired storage water heater with a hot water recirculation loop The gallons/hour per person required was set at 0.4 gallons/hour Assumed 100,000 Btu/hr input rating for 106 gallon tank All Other Codes Standard Specifications Min. Specifications Fuel Type: Gas Storage Capacity: 100 gals Input Rating: 75,000 Btu/hr Et: 77% SL: 1.3+38/V Et: 80% SL: Q/800 + 110x(V)^0.5 20/30
BASE-CASE: Equipment Supply Air Fans & Fan Control Requirements more stringent with newer versions of the codes Fan Control 2004 2007 IECC 2010 VSD 25 hp VSD < 25 hp Inlet vane 5 hp VSD Fan Specifications Supply Total SP: 4 in wc Eff.: 55% For VAV fans 20,000cfm 1.5 hp/1000 cfm For VAV fans 1.5 hp/1000 cfm For VAV fans 1.35 hp/1000 cfm 21/30
BASE-CASE: Equipment Renewable Energy Systems Standard - requires not less than 6 kbtu/sq.ft. of on-site renewable energy For the base case building of 89,304 sq.ft. area: Annual on-site renewable energy 535.8 MMBtu Several options available to generate this amount of energy on-site: Solar thermal systems Photovoltaic systems 22/30
RESULTS Site Energy Consumption BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 4652.6 4045.5 3671.6 3570.3 3557.9 2683.8 2655.3 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1262.8 884.9 924.3 607.1 640.0 681.0 485.8 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 5915.4 4930.3 4595.9 4177.3 4197.9 3364.8 3141.1 16.7 22.3 29.4 29.0 43.1 46.9 Climate Zone 3A ELEC 4684.2 4034.7 3595.2 3541.7 3416.0 2610.8 2364.3 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1634.5 1230.2 664.1 637.0 670.7 693.8 487.5 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 6318.6 5264.9 4259.1 4178.6 4086.5 3304.6 2851.8 16.7 32.6 33.9 35.3 47.7 54.9 Climate Zone 4B ELEC 4385.7 3873.2 3516.3 3508.1 3495.4 2562.1 2349.3 11.7 19.8 20.0 20.3 41.6 46.4 Energy Consumption (MMBtu 7000.0 GAS 1906.2 1246.1 16.7% 1129.3 22.3% 1015.029.4% 1072.0 29.0% 1078.3 43.1% 695.1 46.9% 34.6 40.8 46.8 43.8 43.4 63.5 TOTAL 6000.0 6291.9 5119.2 4645.6 4523.1 4567.5 3640.3 3044.4 18.6 26.2 28.1 27.4 42.1 51.6 5000.0 4000.0 3000.0 2000.0 1000.0 0.0 2004 2007 IECC ELECTRICITY GAS TOTAL 2010 % Above Climate Zone 2A 23/30 23/30
RESULTS Site Energy Consumption BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 4652.6 4045.5 3671.6 3570.3 3557.9 2683.8 2655.3 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1262.8 884.9 924.3 607.1 640.0 681.0 485.8 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 5915.4 4930.3 4595.9 4177.3 4197.9 3364.8 3141.1 16.7 22.3 29.4 29.0 43.1 46.9 Climate Zone 3A ELEC 4684.2 4034.7 3595.2 3541.7 3416.0 2610.8 2364.3 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1634.5 1230.2 664.1 637.0 670.7 693.8 487.5 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 6318.6 5264.9 4259.1 4178.6 4086.5 3304.6 2851.8 16.7 32.6 33.9 35.3 47.7 54.9 Climate Zone 4B 7000.0 ELEC 4385.7 3873.2 3516.3 3508.1 3495.4 2562.1 2349.3 11.7 19.8 20.0 20.3 41.6 46.4 GAS 1906.2 1246.1 1129.3 1015.0 1072.0 1078.3 695.1 34.6 40.8 46.8 43.8 43.4 63.5 TOTAL 6000.0 6291.9 5119.2 4645.6 4523.1 4567.5 3640.3 3044.4 18.6 26.2 28.1 27.4 42.1 51.6 Energy Consumption (MMBtu 5000.0 4000.0 3000.0 2000.0 1000.0 16.7% 32.6% 33.9% 35.3% 47.7% 54.9% 0.0 2004 2007 IECC 2010 ELECTRICITY GAS TOTAL % Above Climate Zone 3A Energy Systems Laboratory @2011 24/30
RESULTS Site Energy Consumption BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 4652.6 4045.5 3671.6 3570.3 3557.9 2683.8 2655.3 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1262.8 884.9 924.3 607.1 640.0 681.0 485.8 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 5915.4 4930.3 4595.9 4177.3 4197.9 3364.8 3141.1 16.7 22.3 29.4 29.0 43.1 46.9 Climate Zone 3A ELEC 4684.2 4034.7 3595.2 3541.7 3416.0 2610.8 2364.3 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1634.5 1230.2 664.1 637.0 670.7 693.8 487.5 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 6318.6 5264.9 4259.1 4178.6 4086.5 3304.6 2851.8 16.7 32.6 33.9 35.3 47.7 54.9 Climate Zone 4B ELEC 7000.0 4385.7 3873.2 18.6% 3516.3 26.2% 3508.128.1% 3495.4 27.4% 2562.1 42.1% 2349.3 51.6% 11.7 19.8 20.0 20.3 41.6 46.4 GAS 1906.2 1246.1 1129.3 1015.0 1072.0 1078.3 695.1 34.6 40.8 46.8 43.8 43.4 63.5 TOTAL 6000.0 6291.9 5119.2 4645.6 4523.1 4567.5 3640.3 3044.4 18.6 26.2 28.1 27.4 42.1 51.6 Energy Consumption (MMBtu 5000.0 4000.0 3000.0 2000.0 1000.0 0.0 2004 2007 IECC 2010 % Above Climate Zone 4B Energy Systems Laboratory @2011 ELECTRICITY GAS TOTAL 25/30
RESULTS Source Energy Consumption BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5 Climate Zone 3A ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8 Climate Zone 4B ELEC 13815.0 12200.6 1076.3 11050.5 11010.5 8070.6 7400.3 11.7 19.8 20.0 20.3 41.6 46.4 GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5 TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7 Conversion from Site to Source Energy: Electricity : 3.13 x Site Electricity Consumption Source Natural Gas: 1.1 x Site Natural Gas Consumption 26/30
RESULTS Source Energy Consumption BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5 Climate Zone 3A ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8 Climate Zone 4B ELEC 18,000 13815.0 12200.6 14.5% 11076.3 21.6% 11050.5 25.7% 11010.5 25.8% 8070.6 42.6% 7400.3 44.5% 11.7 19.8 20.0 20.3 41.6 46.4 GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5 16,000 TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7 Energy Consumption (MMBtu 14,000 12,000 10,000 8,000 6,000 4,000 2,000 0 2004 ELECTRICITY 2007 IECC 2010 GAS % Above Climate Zone 2A 27/30
BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5 Climate Zone 3A ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8 Climate Zone 4B ELEC 13815.0 12200.6 15.0% 11076.3 27.2% 11050.5 28.4% 11010.5 30.5% 8070.6 45.7% 7400.3 51.8% 11.7 19.8 20.0 20.3 41.6 46.4 GAS 18,000 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5 TOTAL 16,000 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7 Energy Consumption (MMBtu RESULTS Source Energy Consumption 14,000 12,000 10,000 8,000 6,000 4,000 2,000 0 2004 ELECTRICITY 2007 IECC 2010 GAS % Above Climate Zone 3A Energy Systems Laboratory @2011 28/30
BUILDING ENERGY PERFORMANCE SUMMARY (MMBtu) IECC 2004 2007 2010 DIFFERENCE w/ (%) IECC 2004 2007 2010 Climate Zone 2A ELEC 14655.7 12743.3 11565.5 11246.4 11207.4 8454.0 8364.2 13.0 21.1 23.3 23.5 42.3 42.9 GAS 1389.1 973.4 1016.7 667.8 704.0 749.1 534.4 29.9 26.8 51.9 49.3 46.1 61.5 TOTAL 16044.8 13716.7 12582.3 11914.3 11911.4 9203.1 8898.6 14.5 21.6 25.7 25.8 42.6 44.5 Climate Zone 3A ELEC 14755.2 12709.3 11324.9 11156.4 10760.4 8224.0 7447.5 13.9 23.2 24.4 27.1 44.3 49.5 GAS 1798.0 1353.2 730.5 700.7 737.8 763.2 536.3 24.7 59.4 61.0 59.0 57.6 70.2 TOTAL 16553.2 14062.5 12055.4 11857.1 11498.2 8987.2 7983.8 15.0 27.2 28.4 30.5 45.7 51.8 Climate Zone 4B ELEC 18,000 13815.0 12200.6 14.7% 11076.3 22.6% 11050.5 23.5% 11010.5 23.4% 8070.6 41.8% 7400.3 48.7% 11.7 19.8 20.0 20.3 41.6 46.4 GAS 2096.8 1370.7 1242.2 1116.5 1179.2 1186.1 764.6 34.6 40.8 46.8 43.8 43.4 63.5 16,000 TOTAL 15911.8 13571.3 12318.6 12167.0 12189.7 9256.7 8164.9 14.7 22.6 23.5 23.4 41.8 48.7 14,000 Energy Consumption (MMBtu RESULTS Source Energy Consumption 12,000 10,000 8,000 6,000 4,000 2,000 0 2004 ELECTRICITY 2007 IECC 2010 GAS % Above Climate Zone 4B Energy Systems Laboratory @2011 29/30
SUMMARY Site vs. Source Energy Consumption Improvement over : SITE ENERGY SOURCE ENERGY - 16.7%-18.6% 14.5%-15.0% -2004 22.3%- 32.6% 21.6%-27.2% -2007 28.1%-33.9% 23.5%-28.4% IECC 27.4%-35.3% 23.4%-25.8% -2010 42.1%-47.7% 41.8%-45.7% - 46.9%-54.9% 44.5%-51.8% 30/30
Thank You! Energy Systems Laboratory Texas A&M University System October 2011