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Question: assignment1 q17 the inner and out surfaces of a 25cm...

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Assignment-1 Q17- The inner and out surfaces of a 25-cm thick wall in summer are at 270C and 440C. The outer surface of the wall exchanges heat by radiation with surrounding surfaces at 40°C, and convection with ambient air also at 40°C with a convection heat transfer coefficient of 8 W/m2 K. Solar radiation is incident on the surface at a rate of 150 W/m2. If both the emissivity and the solar absorptivity of the outer surface are 0.8, determine the thermal conductivity of the wall. 50 W 27 44°C 气-1.0.3
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