Q2. (5 marks) A plant requires 15 kg/s of cooling water to flow through its process coolers. The water will leave the coolers at 45 °C. It is planned to cool the water to 29°C for reuse by contact with air in a cooling tower. The design conditions are as follows: M. entering air at 30°C dry-bulb, 24°C wet-bulb temperature. Makeup water (M) will come from a well at 10°C, hardness 500 ppm dissolved solids. The circulating water (C) is not to contain more than 2000 ppm hardness. XM = 500 2CE 6.35 W X=2000 ppm 15 kg/5 Process Coolers Basin: Pump Cooling Tower If the windage loss (W) is estimated as 0.2 percent of the circulation rate and evaporation losses (E) is 0.35 kg/s. Calculate the makeup water (M) and the blow- down (D).