Assume the normal temperature of the glass, when installed, is 66 F, so you want to design for an 80F rise in temperature. That is a 45 C temperature rise. The long dimension of the window will expand most, by an amount
390 cm * 45 C * 9*10^-6 C^-1 = 0.16 cm = 1.6 mm
You should leave a gap of 0.8 mm at each end. The gap at the top and bottom can be less, but might as well be the same.
thanks again to anyone who can possibly help!!!!! i wish i had a book or notes or something about this kind of stuff :(
The linear expansion coefficient of glass is 9 x 10^-6 (`C)^-1.
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