Commonly used terms in the refrigeration industry

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Commercial Air & Water Cooled Chillers /industrial water chiller

Commonly used terms in the refrigeration industry


Water chiller is a kind of cooling water equipment that can provide constant temperature, constant current and constant pressure. It is widely used in all walks of life, and is often referred to as chillers, refrigerators, chillers, chillers and chillers. The vapor compression chiller includes four main components: compressor, evaporator, condenser and throttling device.


The compressor is the core component of the entire refrigeration system and the source of power for refrigerant compression. Its function is to convert the input electrical energy into mechanical energy, compress the refrigerant vapor, increase the temperature and pressure, and discharge it to the condenser.


The liquid receiver is installed after the condenser and is directly connected to the drain pipe of the condenser. The refrigerant liquid of the condenser should flow into the receiver without obstruction, so that the cooling area of ​​the condenser can be fully utilized. On the other hand, when the heat load of the evaporator changes, the required amount of refrigerant liquid also changes. At that time, the accumulator plays the role of regulating and storing refrigerant. For small chiller refrigeration device systems, liquid receivers are often not installed, but condensers are used to adjust and store refrigerant.

Filter drier

In the chiller refrigeration cycle, it is necessary to prevent the entry of moisture and dirt (oil stains, iron filings, copper filings), etc. The source of moisture is mainly the trace moisture contained in the newly added refrigerant and lubricating oil, or due to the air during the maintenance of the system Moisture brought by entering. If the moisture in the system is not completely drained, when the refrigerant passes through the throttle valve (thermal expansion valve or capillary tube), the moisture will sometimes solidify into ice due to the drop in pressure and temperature, blocking the passage and affecting the normal operation of the refrigeration device. Therefore, a filter drier needs to be installed in the chiller refrigeration system.

Thermal expansion valve

The thermal expansion valve in the chiller refrigeration system is not only a flow control valve, but also a throttle valve in the refrigeration equipment. It is installed between the drier and the evaporator in the refrigeration equipment, and its temperature sensing bag is wrapped in the evaporator. The exit of the device. Its main function is to make the high-pressure and normal-temperature refrigerant liquid throttling and depressurize when it flows through the thermal expansion valve, turning into low-temperature and low-pressure refrigerant wet vapor (mostly liquid, a small part of vapor) into the evaporator and vaporized in the evaporator It absorbs heat to achieve the purpose of cooling and cooling.


The evaporator is a heat exchange device that relies on the evaporation (actually boiling) of the refrigerant liquid to absorb the heat of the cooled medium. Its function in the refrigeration system is to absorb heat (or output cold capacity). In order to ensure that the evaporation process can be carried out stably, it is necessary to continuously pump the evaporated gas with the refrigeration compressor to maintain a certain evaporation pressure.


Refrigerant is the flowing working fluid in the refrigeration system. Its main function is to carry heat and realize heat absorption and heat release when the state changes. Most industrial chillers used in modern industry use R22 or R12 as refrigerant. With increasing emphasis on environmental protection, environmentally friendly refrigerants such as R407C and R134A will gradually replace R22 and other refrigerants that are harmful to the environment.

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