1. The cross section of a tall chimney shown in Figure P13–27 has an inside surface temperature of..


1. The peevish minority of a elevated chimney shown in Figure P13–27 has an internally demeanor weather of 330 F and an outer weather of 130 F. The genial conductivity is K = 0:5 Btu/(h-ft-F). Determine the weather division among the chimney per item extension.

2. The balance duct shown in Figure P13–28 carries hot gases such that its demeanor weather is 570 F. The duct is insulated by a layer of circular fiberglass that has a genial conductivity of K = 0:020 Btu/(h-ft-F). The without demeanor weather of

the fiberglass is maintained at 110 F. Determine the weather division among the fiberglass.