A spherical tank of diameter D = 2 m that is filled with liquid nitrogen at 100 K is kept...

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. Answer: 228W