Posted by George Marsh on January 26, 2011 at 17:12:24 from (71.114.201.168):
In Reply to: insulation question posted by Rick Kr on January 26, 2011 at 13:46:30:
The formula for calculating heat loss is as follows.
#BTU's/hr = 1/R x area of walls in square feet x delta temp.
#BTU's/hr = 1/21 x (2(40 x 14) + 2(60 x 14))x delta temp.
#BTU's/hr = .047619 x (1120 + 1680) x dT #BTU's/hr = 133.33 x dT
So the heat loss for just your walls will be 133 BTU's/hr for each degree you heat the room above outside temp.
The heat loss for the ceiling will be: #BTU's/hr = 1/49 x (40 x 60) x dT = 49 x dT
To calculate the windows heat loss you will need the area of all the window and the U rating of the windows. 1/R = U The formula is the same.
You could say your walls will lose almost 3x more heat than the ceiling. My guess is the windows and doors will lose more heat that the walls and ceiling combined.
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