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Engineering, 05.05.2020 16:10 megaboy

A thin-walled, uninsulated 0.4-m-diameter duct is used to route chilled air at 0.07 kg/s through the attic of a large commercial building. The attic air is at 37°C, and natural circulation provides a convection coefficient of 4 W/m2 ⋅ K at the outer surface of the duct. If chilled air enters a 16-m-long duct at 7°C, what is its exit temperature and the rate of heat gain? Properties of the chilled air may be evaluated at an assumed average temperature of 300 K.

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A thin-walled, uninsulated 0.4-m-diameter duct is used to route chilled air at 0.07 kg/s through the...
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