Question: A square duct, 30 cm by 30 cm, is maintained at a constant temperature of 30oC and an airstream of 50oC and 1 atm is

A square duct, 30 cm by 30 cm, is maintained at a constant temperature of 30oC and an airstream of 50oC and 1 atm is forced across it with a velocity of 6 m/s. Calculate the heat gained by the duct. How much would the heat flow be reduced if the flow velocity were reduced in half?

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