Liquid nitrogen is stored in a spherical tank of 1m diameter, where tank surface is maintained uniformly at 80K. The spherical tank is encosed by a 1.6m diameter concentric sphere with a uniform surface temperature of 273K. Both spherical surface has an emissivity of 0.01, and the gap between the inner sphere and the outer sphere is vacuumed. Calculate the rate of radiation heat transfer at the inner surface.

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D2 DI Liq. nitrogen -A2 E1= €2= 0.01 A1 Vacuum