A 0.083-in-diameter electrical wire at 90°F is covered by 0.02-in-thick plastic insulation (k = 0.075 Btu/ h·ft·°F). The wire is exposed to a medium at 50°F, with a combined convection and radiation heat transfer coefficient of 2.5 Btu/h·ft2·°F. Determine if the plastic insulation on the wire will increase or decrease heat transfer from the wire.

Question

A 0.083-in-diameter electrical wire at 90°F is
covered by 0.02-in-thick plastic insulation (k = 0.075 Btu/
h·ft·°F). The wire is exposed to a medium at 50°F, with
a combined convection and radiation heat transfer coefficient
of 2.5 Btu/h·ft2·°F. Determine if the plastic insulation
on the wire will increase or decrease heat transfer from the
wire.

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