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Chiller
A chiller is a machine that removes heat from a liquid via a vapor-compression or absorption refrigeration cycle. This liquid can then be circulated through a heat exchanger to cool air or equipment as required. As a necessary byproduct, refrigeration creates waste heat that must be exhausted to ambient or, for greater efficiency, recovered for heating purposes. Concerns in design and selection of chillers include performance, efficiency, maintenance, and product life cycle environmental impact
==Use in air conditioning==
In air conditioning systems, chilled water is typically distributed to heat exchangers, or coils, in air handling units or other types of terminal devices which cool the air in their respective space(s), and then the water is re-circulated back to the chiller to be cooled again. These cooling coils transfer sensible heat and latent heat from the air to the chilled water, thus cooling and usually dehumidifying the air stream. A typical chiller for air conditioning applications is rated between (), and at least one manufacturer can produce chillers capable of up to 8,500 tons of cooling. Chilled water temperatures can range from , depending upon application requirements.〔American Society of Heating, Refrigerating and Air-Conditioning Engineers http://www.ashrae.org/publications/page/158〕
When the chillers for the air conditioning systems are not operable or they are in need of a repair or replacement, emergency chillers may be used to supply chilled water. Rental chillers are mounted on a trailer so that they can be quickly deployed to the site. Large chilled water hoses are used to connect between the rental chillers and the air conditioning systems.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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