Latent load occurs in a building, when a cold dry air of winter infiltrates into the building. a building has 300,000 btu/hr of sensible and 60,000 btu /hr of latent load. outside air at 35°f dry bulb and 34°f wet bulb with a flow rate of 1200 cfm mixes with return air at 70°f dry bulb and 50% relative humidity the mixture of air is preheated by a pre-heat coil and then it is humidified by spray of dry steam at 15psia. the final dry bulb temperature of the air is 100°f when it is supplied to the indoors of the building. (a) show the sketch of the various processes in the psychrometric chart. (b) determine the pounds of steam added. (c) determine the heat energy added in the pre-heat coil. (d) determine the cfim of supply air.