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Question: a plane wall of an oven consists of an inside...

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A plane wall of an oven consists of an inside layer of refractory brick 6 in. thick (k = 0.08 Btu/hr-ft-oF) followed by a 9 in. layer of common brick (k = 0.8 Btu/hr-ft-oF). If the temperature of the inner wall surface is 1800oF and that of the outer surface is 200oF, determine the rate of heat loss per unit area, through this wall.

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