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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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May 18 2012, 00:15 -To- May 19 2012, 00:00 EST |
Total Electric Energy Use |
Peak kW |
kWatt-hrs |
| Total consumption |
3.0 |
20.0 |
| PV production |
2.7 |
17.1 |
| Fed back to utility |
2.8 |
13.2 |
| PV used by house |
1.1 |
3.9 |
| Net purchased electricity |
3.0 |
3.0 |
Selected Electric Energy End Use |
Peak kW |
kWatt-hrs |
| Geothermal heat pump |
0.8 |
3.9 |
| Geothermal/well pump |
1.8 |
6.4 |
| Hot water |
0.0 |
0.0 |
| Other |
1.8 |
9.8 |
Indoor Conditions |
Avg |
Min/Max |
| Thermostat Temp (F) |
77.1 |
76.0/ 78.2 |
| Thermostat RH (%) |
57.7 |
53.7/ 63.1 |
Weather Conditions |
Avg/Total |
Min/Max |
| Ambient Temp (F) |
75.3 |
64.8/ 87.2 |
| Ambient RH (%) |
72.7 |
41.6/ 95.4 |
| Horz. Irradiation (wh/m2) |
4794.9 |
0.0/ 1058.0 |
| PV Plane Irradiation (wh/m2) |
6468.4 |
-0.6/ 1100.0 |
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