2. (22 marks total) The sketch shows an air-conditioning system in which one air stream is cooled and dehumidified and then mixed with another stream. One stream enters at point 1 with dry-bulb and wet-bulb temperatures of 30C and 25C respectively, and is then cooled to T = 20C. The other stream enters at 3 with T3 = 25C and a relative humidity of 50%. The total pressure is 100 kPa. t 2 3 (a) (4 marks) From the psychrometric chart, determine the dew point, relative humidity, specific humidity and enthalpy of the moist air at point 1. (b) (6 marks) Calculate the amount of water condensed and the heat transfer in the dehumidifier per kg of dry air. (c) (7 marks) The dry air mass flows of streams 1 and 3 are 5 kg/s and 10 kg/s respectively. Determine the temperature and relative humidity of the air leaving the mixing process at point 4. (d) (5 marks) Determine the moist air volume flow rate at point 1.