Copper wire having a diameter of 3/16 in. is insulated with a 4-in. layer of material having

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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 × 10-6 ohm – cm.

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Fundamentals Of Momentum Heat And Mass Transfer

ISBN: 9781118947463

6th Edition

Authors: James Welty, Gregory L. Rorrer, David G. Foster

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