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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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Jul 29 2010, 00:15 -To- Jul 30 2010, 00:00 EST |
Total Electric Energy Use |
Peak kW |
kWatt-hrs |
| Total consumption |
3.8 |
41.3 |
| PV production |
2.6 |
18.1 |
| Fed back to utility |
2.0 |
6.7 |
| PV used by house |
2.3 |
11.4 |
| Net purchased electricity |
3.8 |
23.2 |
Selected Electric Energy End Use |
Peak kW |
kWatt-hrs |
| Geothermal heat pump |
1.4 |
14.3 |
| Geothermal/well pump |
1.1 |
14.3 |
| Hot water |
0.0 |
0.0 |
| Other |
1.3 |
12.7 |
Indoor Conditions |
Avg |
Min/Max |
| Thermostat Temp (F) |
78.7 |
76.2/ 81.1 |
| Thermostat RH (%) |
50.4 |
47.9/ 54.5 |
Weather Conditions |
Avg/Total |
Min/Max |
| Ambient Temp (F) |
85.0 |
73.8/ 99.3 |
| Ambient RH (%) |
72.5 |
38.3/ 94.9 |
| Horz. Irradiation (wh/m2) |
6156.8 |
-0.1/ 937.0 |
| PV Plane Irradiation (wh/m2) |
6304.0 |
-0.6/ 1038.0 |
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