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I finally took time to measure our roof temperatures. The weather outside is somewhat hazy, air temperature is 88 F. The temperature under the top layer of shingles was 114 F. The temperature on the bottom of the sheathing taken from the inside was 94 F. These temperatures were taken with a good mercury/glass thermometer (the Raytek gun where I work is lost) and where there was practically no breeze on the roof. The time is 1300 central, and we are in ND.
I’ll probably measure these temperatures again on a clear, and warmer day.
Replies
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I have been trying to think of a way to measure the solar emissivity as a variable in this mess and was considering using a solar cell and datalogging it's output along with the various temperatures. In this way it would be possible to do somewhat of an energy balance and quantify the amount of heat gain.
Does everyone agree that there would be no convective heat gain? I mean the same air that supposedly cools the roof can't also heat it.
Conductive heat gain in the roof is not possible, unless perhaps there is a kiln inside.
-Rob
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I finally took time to measure our roof temperatures. The weather outside is somewhat hazy, air temperature is 88 F. The temperature under the top layer of shingles was 114 F. The temperature on the bottom of the sheathing taken from the inside was 94 F. These temperatures were taken with a good mercury/glass thermometer (the Raytek gun where I work is lost) and where there was practically no breeze on the roof. The time is 1300 central, and we are in ND.
I'll probably measure these temperatures again on a clear, and warmer day.