Two concentric spheres of diameters D1 = 0.3 m and D2 = 0.6 m are maintained at uniform temperatures T1 = 800 K and T2 = 500 K and have emissivities ε1 = 0.5 and ε2 = 0.7, respectively. Determine the net rate of radiation heat transfer between the two spheres. Also, determine the convection heat transfer coefficient at the outer surface if both the surrounding medium and the surrounding surfaces are at 30°C. Assume the emissivity of the outer surface is 0.35.
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