Question: A large circular duct, 3.0 m in diameter, carries hot gases at 250oC. The outside of the duct is exposed to room air at 1

A large circular duct, 3.0 m in diameter, carries hot gases at 250oC. The outside of the duct is exposed to room air at 1 atm and 20oC. Estimate the heat loss per unit length of the duct.

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