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Calculate the radiation heat exchange for unit area between two parallel infinite walls, the temperature of which are 400C and 100C if (a) Both are

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Calculate the radiation heat exchange for unit area between two parallel infinite walls, the temperature of which are 400C and 100C if (a) Both are black surfaces (b) Wall at 400C is black body and wall of 100C is grey with emissivity of 0.5 (c)Both walls are grey with emissivity's of 0.8 and 0.5 respectively Assume Stefan-Boltzmann constant as 4.92 x 10-8 kcal/hr.m.K

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