Question: Air is transported through a rectangular duct measuring 1 ft by 2ft. The air enters at 60o F and it is to be heated to

Air is transported through a rectangular duct measuring 1 ft by 2ft. The air enters at 60o F and it is to be heated to 100o F. The surface of the rectangular duct is held at a constant temperature of 120o F. What is the length of the duct required for an air of velocity of 10ft/s. Assume the duct surfaces to be smooth.

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