The inside temperature of a composite wall is maintained at 2000°F, and the outside ambient air temperature is maintained at 70°F. The composite wall consists of three layers; their thickness from the hotter to colder sufaces are 12,12 and 10 inches respectively. The corresponding thermal conductivities are 0.4,0.2 and 0.1 Btu/hr-ft-°F, respectively. Assume that the thermal conductivities are invariant with temperature and inside heat transfer resistance is negligible. The outside air film heat transfer coefficient is 2 Btu/hr-ft²-°F. Calculate the heat loss through the composite wall in Btu/hr-ft².

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