Question: A 12.5 cm-diameter duct is maintained at a constant temperature of 260oC by hot combustion gases inside. The duct is located horizontally in a small

A 12.5 cm-diameter duct is maintained at a constant temperature of 260oC by hot combustion gases inside. The duct is located horizontally in a small warehouse area having an ambient temperature of 20oC. Calculate the length of the duct necessary to provide 37 kW of convection heating.

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