Steam power plants often utilize large cooling towers to cool the condenser cooling water so it can be re-circulated. The process is essentially evaporative adiabatic cooling, in which part of the water is lost and must therefore be replenished. Consider the setup in which 1000 kg/s of warm water at 32C from the condenser enters the top of the cooling tower and the cooled water leaves the bottom at 20C. The moist ambient air enters the bottom at 100 kPa, dry bulb temperature of 18C and a wet bulb temperature of 10C. The moist air leaves the tower at 95 kPa, 30C, and relative humidity of 85%. Determine the required mass flow rate of dry air, and the fraction of the incoming water that evaporates and is lost.