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This research site monitors the electrical consumption as well as the interior space conditions of a near zero energy home in Gainesville, Florida. It is a single story three bedroom/two bath home with 1519 sqft of living space and a preliminary HERS rating of 16. Energy consumption is offset by a 4.2 kw photovoltaic system. It has double pane, low e vinyl windows and a sealed attic with R-30 open cell spray foam insulation. Heating and cooling is provided by a 2 ton, open loop, geothermal heat pump. The house has all Energy Star appliances, water star plumbing fixtures, and an 80 sq. ft/120 gallon drainback solar hot water system. All solar systems are west facing and has been occupied since March 2009. Data collection began in July 2008.
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Feb 21 2012, 00:15 -To- Feb 22 2012, 00:00 EST |
Total Electric Energy Use |
Peak kW |
kWatt-hrs |
| Total consumption |
3.5 |
21.2 |
| PV production |
1.3 |
6.0 |
| Fed back to utility |
0.7 |
2.3 |
| PV used by house |
0.7 |
3.7 |
| Net purchased electricity |
3.5 |
15.2 |
Selected Electric Energy End Use |
Peak kW |
kWatt-hrs |
| Geothermal heat pump |
1.1 |
2.5 |
| Geothermal/well pump |
1.8 |
4.6 |
| Hot water |
2.2 |
0.7 |
| Other |
2.4 |
13.4 |
Indoor Conditions |
Avg |
Min/Max |
| Thermostat Temp (F) |
70.2 |
68.6/ 71.4 |
| Thermostat RH (%) |
60.8 |
59.2/ 62.4 |
Weather Conditions |
Avg/Total |
Min/Max |
| Ambient Temp (F) |
53.6 |
45.3/ 65.6 |
| Ambient RH (%) |
67.5 |
38.1/ 87.7 |
| Horz. Irradiation (wh/m2) |
4988.9 |
0.0/ 817.0 |
| PV Plane Irradiation (wh/m2) |
2023.4 |
-0.6/ 417.8 |
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