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A circular cross-section heating duct of 50 cm diameter runs horizontally through the basement garage of a large apartment complex. The ambient air and walls of the garage are at 17°C. At a location where the surface temperature of the duct is 40°C, determine the radiation contribution to the total heat loss per me ter length if 6-19. (i) the duct has an emittance of 0.7. (i) the duct is painted with aluminum paint with ε-02. Note: For the convection contribution to heat loss, use h 2.67 W/m-K

engineering   Mechanical-Engineering   
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