Question

Problem 3 Part a P=57 Moist air enters the cooler of an air conditioning unit at 25 °C and a relative humidity of 70%. The cooled and dehumidified air leaves the cooler saturated at 18 °C. The temperature of condensed water is 18 °C. The pressure is constant at 101.325 kPa. The mass flow rate of the dry air is mda=67 kg/s. Use the psychometric chart to determine a) The humidity ratio at the inlet b) The relative humidity at the exit c) The humidity ratio at the exit d) Mass flow rate of condensed water in kg/s e) The heat transfer rate in kW f) Draw air handling processes on the psychometric chart Part b In air conditioning, the required comfort conditions are usually achieved by heating the dehumidified air to the required temperature before it leaves the air conditioning unit. This can be done by passing the dehumidified air through a heating coil. Suppose this dehumidified air is heated to 22 °C after leaving the heating coil. It is just a simple heating, without changing the masses calculated in part a. What is the rate of heat transfer from the ?dehumidified air to the heating coil

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ignore p=75