A water chiller is a machine that removes heat from water via a vapor-compression or absorption refrigeration cycle. The cooled water can then be circulated through a heat exchanger to cool equipment, or another process stream (such as air or process water). In industrial application, chilled water or other liquid from the chiller is pumped through process or laboratory equipment.
The air-cooled water chillers are directly cooled by ambient air being mechanically circulated directly through the machine's condenser coil to expel heat to the atmosphere. Compared to water-cooled water chillers, it's much smaller in size and easy to move and the structure is simple, easy for maintenance.