Question: Two perfectly black surfaces are constructed so that all the radiant energy leaving a surface at 800C reaches the other surface. The temperature of the

Two perfectly black surfaces are constructed so that all the radiant energy leaving a surface at 800ºC reaches the other surface. The temperature of the other surface is maintained at 250ºC. Calculate the heat transfer between the surfaces per hour and per unit area of the surface maintained at 800ºC.

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