What would be the result of Problem 17.21 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...

What would be the result of Problem 17.21 if the fluid surrounding the insulated wire was maintained at 70F with a convective heat-transfer coefficient between the insulation and the fluid of 4 Btu/h ft²
F? What would be the surface temperature of the insulation under these conditions?

Problem 17.21

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 70F: How much current may pass through the wire if the insulation temperature is limited to a maximum of 120F? The resistivity of copper is
 ohm-cm.