A vertical, thin pane of window glass that is 1 m on a side separates quiescent room air at T∞,i = 20°C from quiescent ambient air at T∞.o = - 20°C. The walls of the room and the external surroundings (landscape. buildings, etc.) are also at Tsur,i = 20°C and Tsur,o = -20°C, respectively.

If the glass has an emissivity of B = 1, what is its temperature T? What is the rate of heat loss through the glass?

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Window glass T, e Room air Ambient air - Tars