A rectangular forced air heating duct is suspended from
Chapter , Problem 1.79(choose chapter or problem)
A rectangular forced air heating duct is suspended from the ceiling of a basement whose air and walls are at a temperature of T Tsur 5 C. The duct is 15 m long, and its cross section is 350 mm 200 mm. (a) For an uninsulated duct whose average surface temperature is 50 C, estimate the rate of heat loss from the duct. The surface emissivity and convection coefficient are approximately 0.5 and 4 W/m2 K, respectively. (b) If heated air enters the duct at 58 C and a velocity of 4 m/s and the heat loss corresponds to the result of part (a), what is the outlet temperature? The density and specific heat of the air may be assumed to be 1.10 kg/m3 and c 1008 J/kg K, respectively.
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