An air stream at 40C with an initial humidity of 0.028 kg/kg enters an air conditioning unit at 100 m3 /min, where it is cooled so that 2 kg/min water condenses. The specific heats of air and water vapour may be assumed constant at 1.0 kJ/kg K and 1.86 kJ/kg K respectively. Using a psychrometric chart and data from steam tables: a) The dew point, wet-bulb temperature and percentage relative humidity of the initial air, before cooling. b) Find the temperature to which the air must be cooled. c) Find the rate at which heat must be removed from the air by