A chiller is a machine that removes heat from a liquid coolant via a vapor-compression, adsorption refrigeration, or absorption refrigeration cycles. This liquid can then be circulated through a heat exchanger to cool equipment, or another process stream (such as air or process water). As a necessary by-product, refrigeration creates waste heat that must be exhausted to ambience, or for greater efficiency, recovered for heating purposes. Vapor compression chillers may use any of a number of different types of compressors. Most common today are the hermetic scroll, semi-hermetic screw, or centrifugal compressors. The condensing side of the chiller can be either air or water cooled. Even when liquid cooled, the chiller is often cooled by an induced or forced draft cooling tower. Absorption and adsorption chillers require a heat source to function.
Water chiller is used to cool and dehumidify air in mid to large-size commercial, industrial, and institutional facilities. Water or liquid chillers can be liquid-cooled, air-cooled, or evaporatively cooled. Water or liquid-cooled systems can provide efficiency and environmental impact advantages over air-cooled systems.
A water chiller is a device used to lower the temperature of water. Most chillers use refrigerant in a closed loop system to facilitate heat exchange from water where the refrigerant is then pumped to a location where the waste heat is transferred to the atmosphere. However, there are other method in performing this action.
In hydroponics, pumps, lights and ambient heat can warm the reservoir water suction temperatures of water chiller, leading to plant root and health problems. For ideal plant health, a chiller can be used to lower the water temperature below ambient level; 68℉(20 ℃) is a good temperature for most plants. This results in healthy root production and efficient absorption of nutrients.
In air conditioning, water chiller is often used to cool a building’s air and equipment, especially in situations where many individual rooms must be controlled separately, such as a hotel. A chiller lowers water temperature to between 40℉ (4 ℃) and 45℉ (7 ℃) before the water is pumped to the location to be cooled.