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An industrial furnace will is constructed of 0.6 ft thick fireclay brick having k = 0.6 Btu/(hr. ft?F). This is covered on the outer surface with a 0.12 ft thick layer of insulating material having k=0.04 Btu/(hr.ft?F). The innermost surface is at 100 ?F). The steady state heat transfer per square foot is

[A].	450 Btu/(hr. ft2)	[B].	533.33 Btu/(hr. ft2)
[C].	400 Btu/(hr. ft2)	[D].	800 Btu/(hr. ft2)

Answer: Option C

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