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 equipment, or another process stream. As a necessary by product, refrigeration creates waste heat that must be exhausted to ambience, or for greater efficiency, recovered for heating purposes. Chilled water is used to cool and dehumidify air in mid-to large-size commercial, industrial, and institutional facilities. Water chillers can be water-cooled, air-cooled system can provide efficiency and environmental impact advantages over air-cooled system.