Chapter 3, Problem 109EP

A 0.083-in-diameter electrical wire at 90°F is covered by 0.02-in-thick plastic insulation $(k=\text{ 0}\text{.075 Btu/h}\text{.ft}{\text{.}}^{\text{o}}\text{F}).$ and 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 vill increase or decrease heat transfer from the wire.