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A spherical tank, 1.5 m in diameter, is maintained at a temperature of 120 ◦C and...

A spherical tank, 1.5 m in diameter, is maintained at a temperature of 120 ◦C and exposed to a convection environment with heat transfer coefficient, h=15 W/m2 ◦C and T∞ =20 ◦C. For the same surface temperature of the tank, it is desired to insulate the tank in order to decrease the heat loss by 45 percent, determine the thickness of insulation layer (k=0.2 W/m ◦C ) and the outer surface temperature.

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