-
The working principle of industrial chillers and the state changes of refrigerants
If the refrigeration system of industrial refrigeration units is classified according to compression methods, there are single-stage compression, two-stage compression, and cascade refrigeration. Among them, single-stage compression refrigeration is the most common and basic method used in industrial chillers. So, how does the state of the refrigerant (refrigerant) change during the refrigeration process?
Low pressure refrigerant vapor enters the compressor, is compressed into high-pressure superheated vapor, and then enters the condenser for condensation. The condensed high-pressure liquid refrigerant is expanded and throttled by a thermal expansion valve to form low-pressure refrigerant wet vapor, which enters the evaporator and absorbs heat to vaporize. Finally, the low-pressure refrigerant vapor is sucked into the compressor again and enters the next refrigeration cycle. The refrigerant completes the processes of compression, condensation, throttling, and evaporation in the four components of the compressor, condenser, expansion valve, and evaporator, forming a complete refrigeration cycle.
Refrigerant compression process
Low pressure refrigerant vapor enters the compressor from the evaporator end of the chiller unit and is compressed to do work. Its pressure also quickly rises to the condensing pressure. Since refrigerant vapor is compressed and discharged instantaneously, heat is not transferred to the external environment, and it can be considered as an adiabatic compression process.
Refrigerant condensation process
After the high-pressure superheated steam of the refrigerant enters the condenser of the industrial chiller unit, the condenser will continuously carry out the heat in the refrigerant, so that the refrigerant is converted from high-pressure superheated steam to saturated steam, and becomes saturated liquid refrigerant in the continuous condensation process.
Refrigerant throttling process
When saturated liquid refrigerant passes through throttling devices such as capillary tubes and thermal expansion valves in industrial chillers, the pressure of the refrigerant is rapidly released, and the temperature of the refrigerant gradually decreases to the evaporation temperature. At this time, the refrigerant (refrigerant) is in a state of coexistence of gas and liquid phases, but the refrigerant liquid accounts for the vast majority, while the refrigerant vapor accounts for a relatively small portion.
The heat absorption process of refrigerant evaporation
After the refrigerant enters the evaporator of the industrial chiller through the throttling device, the gas-liquid mixture continuously absorbs heat from the circulating refrigerant and vaporizes into gaseous refrigerant. The refrigerant (water, ethylene glycol, or salt water) is continuously cooled and the cooling capacity is output to the application equipment. The evaporated refrigerant is then sucked into the compressor for the next compression cycle process.
Refrigeration Encyclopedia
CN
EN
Official weibo/
Online message/
Contact us/
Legal notices
Production equipment
Production equipment
Production equipment
Production equipment
Production equipment
Production equipment
CCTV
