(a) Calculate the R-value of a thermal window made of two
Chapter 20, Problem 53(choose chapter or problem)
(a) Calculate the R-value of a thermal window made of two single panes of glass each 0.125 in. thick and separated by a 0.250-in. air space. (b) By what factor is the transfer of energy by heat through the window reduced by using the thermal window instead of the single-pane window? Include the contributions of inside and outside stagnant air layers.
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