A thin-walled, uninsulated 0.3-m-diameter duct is usedto
Chapter 8, Problem 8.72(choose chapter or problem)
A thin-walled, uninsulated 0.3-m-diameter duct is usedto route chilled air at 0.05 kg/s through the attic of alarge commercial building. The attic air is at 37C, andnatural circulation provides a convection coefficient of2 W/m2?K at the outer surface of the duct. If chilled airenters a 15-m-long duct at 7C, what is its exit tempera-ture and the rate of heat gain? Properties of the chilledair may be evaluated at an assumed average tempera-ture of 300 K.
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