Originally Posted by
wienerman
The ambient temperature at which your body will be at thermal equilibrium depends on the rate of heat generation per unit area P and the thermal insulance of the clothing R. Using formulas and values I found during a brief web search this morning, the ambient temperature (in Centigrade) is calculated by:
T = (31 - 0.155*P*R) where P is the average heat generated by the human body per square meter and R is the CLO value
P varies based on activity and average values appear to be:
P(sleep) = 48, P(rest) = 60, P(slow walk) = 120, and P(fast walk) = 180 (units are W/m^2, and units for CLO are C M^2/W)
so putting it together, the ambient temperature that you should be comfortable while sleeping in a double layer of Thinsulate is:
T= 31-0.155*P(sleep)*R(2layers) = (31-0.155*48*(2*1.9))) = 2.7C (or 36.9F for us Americans)
Caveat: this assumes an UQ and TQ of same thickness and no wind
there is your answer, you can get down to about 3C. theoretically, anyway. this has been a fun distraction, now back to work!!
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