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Air enters the duct of an air-conditioning system at 100 kPa and 10°C at a volume flow rate of 12 m3 /min. The diameter of the duct is 25 cm and heat is transferred to the air in the duct from the surroundings at a rate of 2.2 kJ/s. Determine (a) the velocity of the air at the duct inlet and (b) the temperature of the air at the exit.

 Air enters the duct of an air-conditioning system at 100 kPa and 10°C at a volume flow rate of 12 m3 /min. The diameter of the duct is 25 cm and heat is transferred to the air in the duct from the surroundings at a rate of 2.2 kJ/s. Determine (a) the velocity of the air at the duct inlet and (b) the temperature of the air at the exit.

Grade:12th pass

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