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(Solved): The inner and outer surfaces of a 20cm thick wall are at 20C and 40C, respectively. The out ...
The inner and outer surfaces of a thick wall are at and , respectively. The outer surface of the wall exchanges heat by radiation with surrounding surfaces at , and convection with ambient air also at the same temperature with a convective heat transfer coefficient of 10 . Solar radiation is incident on the surface at a rate of . If both the emissivity and the solar absorptivity of the outer surface are 0.8 , determine the effective thermal conductivity of the wall. Here you can solve easily. Variations of this exercise can include, among others: - Calculate the equilibrium outside wall temperature if the incident radiation is changed (unlikely, the equation can get tricky to solve) - Calculate how much of the incident radiation would need to be blocked for a different outside wall temperature.
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