Consider a cylindrical furnace with ro- H-1 m. The top (surface 1) and the base (surface 2) of the furnace has emissivities ?,-0.8 and ?2 = 0.4, respectively, and are maintained at uniform temperatures T = 790 K and T2-530 K. The side surface closely approximates a blackbody and is maintained at a temperature of T 440 K. Determine the net rate of radiation heat transfer from surface 1

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