4. A small auditorium is required to be maintained at 22 C dry bulb temperature and 70 % relative humidity. The ambient conditions are at 30 C dry bulb temperature and 75 % relative humidity. The amount of free air circulated is 200 m3/min. The required conditions are achieved by first cooling and dehumidifying through a cooling coil having apparatus dew point of 14 C and then by heating. With the help of psychrometric chart find. a) The capacity of the cooling coil intones of refrigeration and its by-pass factor. b) The amount of water vapour removed by the cooling coil in kg/h. c) The capacity of the heating coil in kW and its surface temperature. Assume by-pass factor as 0.2

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A: Given data:

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