Question: 5. Air is transported through a rectangular duct measuring 1ft by 2ft. The air enters at 60F and it is to be heated to 100F.

5. Air is transported through a rectangular duct measuring 1ft by

5. Air is transported through a rectangular duct measuring 1ft by 2ft. The air enters at 60F and it is to be heated to 100F. The surface of the rectangular duct is held at a constant temperature of 120F. 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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