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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 white metal roof on plywood decking and a vented, R-30 batt insulated attic. The experiment also has a white metal roof however, it is fastened to steel furring strips across the rafters and no plywood decking. The attic is sealed and over an R-30 SIP ceiling.
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Jul 28 2010, 00:15 -To- Jul 29 2010, 00:00 EST |
Electric Power Use |
Peak Watt-hrs |
Watt-hrs |
| Experiment AC |
600.0 |
3982.0 |
| Control AC |
612.0 |
3840.0 |
| Control Lights |
56.0 |
457.0 |
| Experimental Lights |
76.0 |
1156.0 |
| Experiment Fans |
0.0 |
0.0 |
Building Conditions |
Avg |
Min/Max |
| Experiment Roof Surface |
90.2 |
74.1/ 119.4 |
| Control Roof Surface |
92.5 |
74.4/ 129.6 |
| Experiment Attic Temp. |
90.0 |
77.4/ 110.0 |
| Control Attic Temp |
90.9 |
80.4/ 105.2 |
| Experiment Room Temp. |
80.2 |
78.3/ 88.3 |
| Control Room Temp. |
79.5 |
77.9/ 81.4 |
| Experiment Room RH |
39.6 |
35.0/ 69.1 |
| Control Room RH |
38.8 |
35.4/ 42.8 |
Weather Conditions |
Avg |
Min/Max |
| Ambient Temp (F) |
85.6 |
78.6/ 94.0 |
| Ambient RH (%) |
69.4 |
45.9/ 85.3 |
| Solar (w/m2) |
285.4 |
0.0/ 1036.0 |
| Dewpoint (F) |
80.9 |
74.9/ 83.3 |
| Sky Temp (F) |
73.6 |
63.9/ 90.1 |
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