Humidification with Cooling

The process is same as the Adiabatic saturation (figure 36.7) except that the air may leaves unsaturated.

Extensively used in desert coolers which is used for cooling homes in not & dry climates. An unsaturated air-water vapour mixture is made to flow through porous pads soaked in water (figure 36.8)

denotes the rate at which water is evaporated. and are the specific humidity of air-water vapour mixture at the inlet and outlet respectively.