Air enters an evaporative cooler at 40°c dbt and 24 °c wbt. the required relative humidity at exit is limited to 70 % (a) calculate the dry bulb temperature of the air at the exit. (b) plot the process on a psychrometric chart. (c) plot a process that may be achieved using an evaporative plate heat exchange system having the same effectiveness (saturation efficiency). what will be the supply air wbt and dbt?