Evaporative cooling is a process in which hot dry air is cooled by evaporating water into it. Air naturally soaks up water. This water requires a great deal of energy to change from a liquid to a gas. This energy has to come from the air during this evaporation. This natural process is exploited by all mammals - sweat evaporates from the surface of the skin and the skin is cooled. For thousands of years it has been used to cool buildings and tents by hanging a wet cloth over an open door or window. As the air passes through the weave of the cloth the air is cooled and the atmosphere is made more comfortable.
The Evaporation Air Cooler is designed to provide comfort and relief from the heat in those situations and places where it is simple not possible to implement them.
Air Coolers are not air conditioners with a compressor and freon gas .They cool air by means of the evaporation of water ,which works best in hot ,dry climates .The recommended humidity level is 60% or less which allow a noticeable temperature decrease and causes people to feel comfortable .The temperature decrease will be smaller in more humid climates because the higher the humidity ,the less evaporation can occur and so not so much cooling is achieved .
Evaporative air cooler is to cool air by water evaporation to absorb latent heat in air. This is called the adiabatic humidifying and cooling process. The wet bulb depression is the driving force of the cooling process