An industrial wall is constructed of 20 cm thick fireclay (k =1 W/m.°C). This is covered on the outer surface with a 3 cm layer of insulating material (k = 0.075 W/m.°C). The innermost surface is at 940°C and the outermost at 40°C. Calculate the steady state heat transfer through the wall in W/m? and the temperature of the interface between the fireclay and the insulating material in °c.

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