Fresh air at 24 C in which partial pressure of water vapor is 0.0118 atm is blown at a rate of 210 m/hr, first through a preheater and then adiabatically saturated in a spray chamber to 100% saturation and again reheated. This reheated air has a humidity of 0.024 kg water/kg dry air. It may be assumed that the fresh air and the air leaving the reheater have the same percentage humidity. Determine (1) the temperature of air after preheater, spray chamber and reheater (ii) heat requirements for preheating and reheating. (12) (April '99)