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The Night Cool research site demonstrates an experimental building concept that uses the cool, roof decking as a heat sink for cooling. Once the attic air mass is cooled to a specific temperature, it is then circulated to the interior space to off-set internal heat gains and reduce the overall air conditioner energy use. The experiment consists of two identical, wood frame constructed buildings with differing roof systems. The control building has a standard shingle roof on plywood decking and a vented, R-30 batt insulated attic. The experiment has a white metal roof on steel furring strips and a sealed attic over an R-30 SIP ceiling.
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Jul 05 2008, 00:15 -To- Jul 06 2008, 00:00 EST |
Electric Power Use |
Peak Watt-hrs |
Watt-hrs |
| Experiment AC |
364.0 |
2725.0 |
| Control AC |
372.0 |
3363.0 |
| Control Lights |
148.0 |
2621.0 |
| Experimental Lights |
148.0 |
2642.0 |
| Experiment Fans |
20.0 |
111.0 |
Building Conditions |
Avg |
Min/Max |
| Experiment Roof Surface |
85.2 |
66.5/ 117.2 |
| Control Roof Surface |
87.0 |
65.8/ 125.7 |
| Experiment Attic Temp. |
85.3 |
71.5/ 103.8 |
| Control Attic Temp |
84.8 |
72.2/ 101.2 |
| Experiment Room Temp. |
79.4 |
78.8/ 80.2 |
| Control Room Temp. |
78.9 |
78.2/ 79.5 |
| Experiment Room RH |
43.9 |
38.9/ 50.9 |
| Control Room RH |
41.2 |
39.6/ 42.7 |
Weather Conditions |
Avg |
Min/Max |
| Ambient Temp (F) |
79.7 |
70.7/ 87.7 |
| Ambient RH (%) |
75.9 |
53.3/ 97.2 |
| Solar (w/m2) |
301.6 |
0.0/ 1002.0 |
| Dewpoint (F) |
71.7 |
68.8/ 73.7 |
| Sky Temp (F) |
65.7 |
55.1/ 87.6 |
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