Repeat Prob. 13–71 by replacing the cubic enclosure by a spherical enclosure whose diameter is 3 m.

Data from problem 71

A spherical tank of diameter D = 2 m that is filled with liquid nitrogen at 100 K is kept in an evacuated cubic enclosure whose sides are 3 m long. The emissivities of the spherical tank and the enclosure are ε₁ = 0.1 and ε₂ = 0.8, respectively. If the temperature of the cubic enclosure is measured to be 240 K, determine the net rate of radiation heat transfer to the liquid nitrogen.

Transcribed Image Text:

Liquid N₂