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Mr. Dubey • 89.33K Points
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Q. The inner wall of a furnace is at a temperature of 700°C. The composite wall is made of two substances, 10 and 20 cm thick with thermal conductivities of 0.05 and 0.1 W.m-1.°C1 respectively. The ambient air is at 30°C and the heat transfer co-efficient between the outer surface of wall and air is 20 W.m-2 .°C-1 . The rate of heat loss from the outer surface in W.m-2 is

(A) 165.4
(B) 167.5
(C) 172.5
(D) 175
  • Correct Answer - Option(A)
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  • Filed under category Heat Transfer
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