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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
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Apr 05 2011, 00:15 -To- Apr 06 2011, 00:00 EST |
Electricity Usage |
kWh |
KBtu's |
| Condenser unit |
0.8 |
2.6 |
| Air Handler |
0.4 |
1.4 |
| Total House (Grid+PV) |
24.4 |
83.4 |
| PV Production |
13.1 |
44.7 |
| Energy to Grid |
6.0 |
20.4 |
Interior Conditions |
Average |
Min/Max |
| Thermostat Temp (deg.F) |
75.7 |
73.5/ 77.6 |
| Thermostat Humidity (%RH) |
43.8 |
40.0/ 46.2 |
| Sealed Attic Temp (deg.F) |
75.5 |
71.4/ 79.6 |
| Sealed Attic Humidity (%RH) |
46.4 |
44.6/ 48.8 |
Ambient Conditions |
Avg/Tot |
Min/Max |
| Avg Temperature (deg.F) |
59.0 |
37.3/ 77.1 |
| Avg Relative Humidity (%RH) |
34.4 |
13.9/ 70.2 |
| Tot Horizontal Solar Radiation (W/m2) |
28883.7 |
300.9 |
Natural Gas Usage |
CuFt |
KBtu's |
| Total House |
41.8 |
42.6 |
| Furnace |
0.0 |
0.0 |
| Range Top |
0.0 |
0.0 |
| Dryer |
0.0 |
0.0 |
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