Air is transported through a rectangular duct measuring 2 ft by 4 ft The air enters at 120F and flows with amass velocity of 6 lb m s ft 2 If the duct walls are at a temperature of 80F, how much heat is lost by the air per foot of duct length What is the corresponding temperature decrease of the ai...

Air is transported through a rectangular duct measuring 2 ft by 4 ft.The air enters at 120F

Question:

Air is transported through a rectangular duct measuring 2 ft by 4 ft.The air enters at 120°F and flows with amass velocity of 6 lb_m/s · ft². If the duct walls are at a temperature of 80°F, how much heat is lost by the air per foot of duct length? What is the corresponding temperature decrease of the air per foot?

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