Question: Please solve problem 17.21 using problem 17.20 -6 17.20 Copper wire having a diameter of 3/16 in is insulated with a 4-in layer of material

Please solve problem 17.21 using problem 17.20

-6 17.20 Copper wire having a diameter of 3/16 in is insulated with a 4-in layer of material having a thermal conductivity of 0.14 Btu/h ft F. The outer surface of the insulation is maintained at 70 F. How much current may pass through the wire if the insulation temperature is limited to a maximum of 120 F? The resistivity of copper is 1.72 x 10-ohm-cm. 17.21 What would be the result of Problem 17.20 if the fluid surrounding the insulated wire was maintained at 70 F with a convective heat-transfer coefficient between the insulation and the fluid of 4 Btu/h ft? F? What would be the surface temperature of the insulation under these conditions

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