PROBLEM (3-42) (3-43) Air at 26 °C and 55% relative humidity enters an air conditioning unit at a rate of 1,000 kg/h. The unit consists of a cooling coll and a dehumidifier where air is cooled and dehumidified to 3 °C and 90% relative humidity. The air then passes through an electric heater and leaves it at 21 °C (state 1). After that, air passes through spray device where it is humidified to 95% relative humidity. Part of the air is bypassed across the spray device such that the resulting supply relative humidity of 60%. Sketch the process on the psychrometric chart and calculate the followings: (a) Bypass mass flow rate, m. (b) Cooling coil and heating coil capacities. T-3°C -1,000 kg/h A-90% T-26°C -55% T₁=21°C Occ QN.C + 5-95%