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[[File:ABSORPTION CHILLER.jpg|thumb|right|Absorption Coolers]] | |||
[[File:ABSORPTION CHILLER COMPONENTS.gif|thumb|right|Components of Absorption Coolers]] | |||
'''Absorption Coolers''' use heat rather than electricity as their energy source. Because natural gas is the most common heat source for absorption cooling, it is also referred to as gas-fired cooling. Other potential heat sources include propane, solar-heated water, or geothermal-heated water. | |||
Although mainly used in industrial or commercial settings, absorption coolers are commercially available for large residential homes. | |||
'''An absorption cooling cycle relies on three basic principles:''' | |||
♦ When a liquid is heated it boils (vaporizes) and when a gas is cooled it condenses | |||
♦ Lowering the pressure above a liquid reduces its boiling point | |||
♦ Heat flows from warmer to cooler surfaces. |