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really lost on this heat transfer problem 6-24 An air-conditioning duct has a cross section of 45cm by 90cm. Air flows in the duct at

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6-24 An air-conditioning duct has a cross section of 45cm by 90cm. Air flows in the duct at a velocity of 7.5m/s at conditions of 1atm and 300K. Calculate the heat-transfer coefficient for this system and the pressure drop per unit length

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