Evaporative air coolers include a system of cooling in which the evaporation of a liquid, typically into the surrounding air, cools the object or a liquid in contact with it. There are number of evaporative designs that people can purchase.
* Direct Evaporative Coolers – this open circuit is used to lower the temperature of air by using what is referred to as a latent heat of evaporation, changing water into vapour. The energy in the air does not change. During the process the warm dry air is changed to cool moist air.
* Indirect Evaporative Cooling – This is a closed circuit system. It is similar to a direct evaporative cooling system. However in this case some sort of heat exchanger is needed. The cooled moist air never comes in contact with the conditioned environment.
* Two-stage Evaporative Cooling – this system is also referred to as an indirect cooling system. This is a traditional system of cooling that uses only a fraction of energy arctos portable air cooler of vapour compression air condition systems. There are drawbacks to using this system however as they tend to make the air very humid which can make people very uncomfortable.
* Cooling towers – cooling towers are structures that are used for cooling water. This process works in a similar way as the evaporative air cooler system. Cooling towers are typically used on large and tall buildings or in industrial sites. They work as they transfer heat to the environment from chillers, for example in the Rankin power cycle.