The square duct shown in Figure P13-28 carries hot gases such that its surface temperature is 570

Question:

The square duct shown in Figure P13-28 carries hot gases such that its surface temperature is 570 oF. The duct is insulated by a layer of circular fiberglass that has a thermal conductivity of K = 0.020 Btu / (h-ft-oF). The outside surface temperature of the fiberglass is maintained at 70 oF. Determine the temperature within the fiberglass.
Figure P13-28

Distribution
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