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Q6/ A spherical tank, 1 m in diameter, is maintained at a temperature of 120 C and exposed
to a convection environment. With h=25W/m2.•C and To =15 C, what thickness of
urethane foam should be added to ensure that the outer temperature of the insulation does
not exceed 40 C? What percentage reduction in heat loss results from installing this
insulation?

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