Chilled water units, categorized in the industry by their cooling methods:Air-cooled water chillerThere are two types of water-cooled chillers: enclosed and open. They are further categorized by design as box-type chillers, open chillers, semi-enclosed chillers. Additionally, they are differentiated by the compressor type, including reciprocating, screw, scroll, and centrifugal chillers. Temperature control divides them into low-temperature chillers and normal-temperature chillers, with normal temperatures typically maintained between 0-35 degrees Celsius. Low-temperature chillers generally control temperatures around 0 to -70 degrees Celsius.

The working principle of a chiller starts with the refrigerant, Freon, being compressed into a high-temperature, high-pressure state. The compressed gaseous refrigerant then releases its heat in the condenser, which is carried away by a cooling tower or fan. This transforms it into a low-temperature, high-pressure liquid refrigerant, which then passes through a desiccant filter to remove impurities. Afterward, it undergoes throttling in the throttle valve, also known as an expansion valve, to reach a low-pressure state, becoming a gas-liquid mixture. It then absorbs heat from the cooled substance in the evaporator, retransforming into a gaseous refrigerant. This process is the refrigeration cycle of the chiller.

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