Question A spherical tank (AISI 302 stainless steel) has an outside diameter of

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Question

A spherical tank (AISI 302 stainless steel) has an outside diameter of 40cm and a wall thickness of 2cm. It contains biochemical reactants maintained at 1 80C. The ambient air temperature is 20C. What is the thickness of the layer of insulation required to maintain the outside surface temperature at 55C if the thermal conductivity of the insulation is 0.1W/mK, and the convective heat transfer coefficient of the outside of the insulation is 9 W/m^2K? Also, calculate the resulting heat loss rate from the tank. [AISI 302 stainless steel has a thermal conductivity of 15W/mK from the table in the book]

Explanation / Answer

solution

heat loss rate = K dT/dx

   = 0.1 ( 180 - 55) / (0.02)

= 625 W/m2

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