2. (11 marks total) The sketch shows one of the cooling towers at the University's power plant. The following data were recorded from the operating of the tower in March 2010. Water enters the tower at 3 with a temperature of T = 10C and a mass flow rate m3 = 130 kg/s. Air enters the tower at 1 with a dry-bulb temperature of TDBI = 6C, a wet-bulb temperature of TWB! = 4C, and a pressure of 100 kPa. The water is cooled by partial evaporation of liquid in the tower and leaves at T, = 8C. The liquid lost by evaporation is replaced by a make-up water flow m, such that m3 = ms. Air leaves the tower at T = (2) 7C and 100% relative humidity at a pressure of 100 kPa. You may neglect the work input to the fan at the top of the tower and assume that T = T. (a) (8 marks) Determine the air mass flow m in kg dry air/s. (b) (3 marks) Determine the make-up water quantity m, in kg/s.