The cross section of a storm window is shown in the sketch. How much heat will be lost through a window measuring 1.83 m by 3.66 m on a cold day when the inside and outside air temperatures are, respectively, 295 and 250 K? Convective coefficients on the inside and outside surfaces of the window are 20 and 15 W/m²· K, respectively. What temperature drop will exist across each of the glass panes? What will be the average temperature of the air between the glass panes?

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Air space 0.8 cm wide Window glass 0.32 cm thick