A small size cooling tower is designed to cool 6 litres of water per second, the inlet temperature of which is 50 °C. The motor driven fan induces 10 m3/s of air through the tower and the power absorbed is 5.15 kW. The air entering the tower is at 18 °C, and has a relative humidity of 60 %. The air leaving the tower can be assumed to be saturated and its temperature is 26 °C. Assume that pressure remains constant throughout the tower at 1.013 bar. Calculate: a) The amount of cooling water (make-up) required per second
b) The final temperature of the water