Question: A large bare duct having a diameter of 30 cm runs horizontally across a factory area having environmental conditions of 20oC and 1 atm. The

A large bare duct having a diameter of 30 cm runs horizontally across a factory area having environmental conditions of 20oC and 1 atm. The length of the duct is 100 m. Inside the duct a low pressure steam flow maintains the duct wall temperature constant at 120oC. Calculate the total heat lost by convection from the duct to the room.

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