The basic composition of the chiller refrigeration system:
Condenser: In the refrigeration process, the condenser plays a role in outputting heat energy and condensing the refrigerant. After the high-pressure superheated vapor discharged from the refrigeration compressor enters the condenser, it transfers all the heat absorbed in the working process, including the heat absorbed from the evaporator and refrigeration compressor and in the pipeline, to the surrounding medium (water or Air) taken away; the high-pressure superheated vapor of the refrigerant recondenses into a liquid. (According to different cooling media and cooling methods, condensers can be divided into three categories: water-cooled condensers, air-cooled condensers, and evaporative condensers.)
Liquid receiver: The liquid receiver is installed after the condenser and is directly connected with the condenser's drain pipe. The refrigerant liquid of the condenser should flow into the receiver unimpededly, 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: It is necessary to prevent the entry of moisture and dirt (oil, iron filings, copper filings) in the refrigeration cycle of the chiller. The source of moisture is mainly the trace moisture contained in the newly added refrigerant and lubricating oil, or due to Moisture caused by air entering when overhauling the system. 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 must be installed in the chiller refrigeration system.
Evaporator: 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 and lastingly, a refrigeration compressor must be used to continuously pump the evaporated gas away to maintain a certain evaporation pressure.
Thermal expansion valve: In the chiller refrigeration system, the thermal expansion valve is not only a flow control valve, but also a throttle valve in the refrigeration equipment. It is installed between the filter dryer and the evaporator in the refrigeration equipment. Its temperature sensing bag It is wrapped at the outlet of the evaporator. 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.
Refrigerant: Most industrial chillers used in modern industry use R22 or R12 as a refrigerant. 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.