Cooling water enters a cooling tower at a rate of 1000 kg/h and 70 degree C. Water is pumped from the base of the lower at 24 degree C and some make-up water is added afterwards. Air enters the tower at 15 degree C, 50% RH, 1.013 bar, and is drawn from the tower saturated at 34 degree C, 1 bar. Calculate the flow rate of the dry air in kg/h and the make-up water required per hour. Ans. 2088 kg/h, 62.9 kg/h.