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Summary Report
Indoor T & RH
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HVAC Performance
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"cp3 database

As part of the U.S. DOE Building America program, FSEC and CPS Energy are evaluating the performance of three homes in San Antonio, Texas with identical ~2,000 ft2 floor plans and orientation. One home built to builder standard practice serves as the control (CP1), while the other homes (CP2 & CP3) demonstrate high performance features.

Photvoltaic Home (CP3) Features:
- 37 HERS Index
- 2.4 kW roof-integrated PV array
- Sealed attic with R-28 spray polyurethane foam at the roof deck
- Frame walls with R-15 spray foam + R-3 rigid foam sheathing
- Energy Star windows, Uo = 0.34, SHGC = 0.32
- Enhanced air sealing
- SEER 18 air conditioner and 94% gas furnace
- Energy star appliances
- Fluorescent lighting package

Mar 09 2010, 00:15 -To- Mar 10 2010, 00:00 EST

Electricity Usage

kWh

KBtu's
Condenser unit 0.5 1.7
Air Handler 0.5 1.6
Water Heater 0.1 0.3
Total House (Grid+PV) 17.6 59.9
PV Production 13.2 45.0
Energy to Grid 5.7 19.3

Interior Conditions

Average

Min/Max
Thermostat Temp (deg.F) 73.7 71.8/ 76.8
Thermostat Humidity (%RH) 56.8 28.7/ 62.1
Sealed Attic Temp (deg.F) 74.7 71.8/ 78.6
Sealed Attic Humidity (%RH) 60.2 58.6/ 63.8
Water Heater Inlet (deg.F) 68.6 64.6/ 74.7
Water Heater Outlet (deg.F) 114.3 72.6/ 137.9

Ambient Conditions

Avg/Tot

Min/Max
Avg Temperature (deg.F) 67.4 51.5/ 79.8
Avg Relative Humidity (%RH) 62.7 18.5/ 94.5
Tot Horizontal Solar Radiation (W/m2) 24274.3 252.9

Hot Water Flow

Tot/Avg

Min/Max
Tank Water Heater - Tot Gal 65.1 0.0/ 18.4
Tank Water Heater - Avg GPM 0.9 0.2/ 2.0

Hot Water Energy

Tot. Btu/Eff

Tankless WH Gas Use 47175.0
Tankless WH Output 37140.0
Tankless WH Elec. Use 281.1
Tankless WH Period Effic. 0.783
HW circ pump RTime(min) 4.7

Natural Gas Usage

CuFt

Total House 48.0
Furnace 0.0
Range Top 8.0
Water Heater 46.3
Dryer 0.0

Total House Energy in KBtu's

KWhrs or Cuft

KBtu's
Total House Gas Use (Cuft) 48.0 49.0
Furnace gas Use (Cuft) 0.0 0.0
Range Top Gas Use (Cuft) 8.0 8.2
Tankless Hot Water Gas (Cuft) 46.3 47.2
Dryer Gas Use (Cuft) 0.0 0.0
Tankless Hot Water Power (KWhrs) 0.1 0.3
A/C Air Handler Power (KWhrs) 0.5 1.6
Total House Energy (KWhrs) 10.1 34.3
Net Energy to Grid (KWhrs) 5.7 19.3
PV Inverter Energy to House (KWhrs) 13.2 45.0
AC Compressor Energy (KWhrs) 0.5 1.7
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