A thick-wall spherical container is filled with a hot liquid.
A pump circulates the liquid to maintain the bulk temperature at 150 C. Ignore
temperature gradient in the liquid. Find temperature in the middle of the wall
and the energy required to keep liquid temperature at 150 F for an hour. Di
= 3 m, _wall = 20 cm, k = 20 W/m·C, Tfi = 150 C, Tfo
= 25 C, hi = 500 W/m2 ·C, and ho = 10 W/m2
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