Evaporative refrigeration

 Evaporative refrigeration makes use of the principle that when a liquid evaporator, it absorbs heat equivalent to its latent heat of vaporization from the surroundings, thereby cooling it.

Cooling of water in the earthen pitcher - the water coming out of the pores of the pitcher evaporates when it comes in contact with dry air, thereby cooling the water in the pitcher. When a drop of spirit is put on the palm of the hand, it evaporates producing a cooling effect. Evaporation cooling may be defined as the adiabatic transfer of heat from the air to water. It is utilized in cooling towers where condenser water is cooled by spraying it from the top and forcing a current of air from below. Another application is the evaporative type of condensers.

Yet another application is in desert coolers or room coolers. Dry air is passed through wet pads. Due to evaporation, the air gets cooled. The principle is also utilized in making artificial snow.