Consider a 0.8-m-high and 1.5-m-wide double-pane window consisting of two 4-mm-thick layers of glass (k  0.78 W/m · °C) separated by a 10-mm-wide stagnant air space (k  0.026 W/m · °C). Determine the steady rate of heat transfer through this double-pane window and the temperature of its inner surface for a day during which the room is maintained at 20°C while the temperature of the outdoors is 10°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1  10 W/m2 · °C and h2 40 W/m2 · °C, which includes the effects of radiation.

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