A hot air duct having an outside diameter of 250 mm and a surface temperature of 95°C is located in.

A hot air duct having an outside diameter
of 250 mm and a surface temperature of 95°C is located in a large room whose
walls are at 21°C. The air in the room is at 28°C and the heat transfer
coefficient for free convection between the duct and the air is 5.82 W/m2
K. Estimate the rate of heat transfer per metre of duct if (a) the duct is bare
tin ( = 0.1)
and (b) the duct is painted with white lacquer ( = 0.9).

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