Answer: The refrigeration compressor sucks the low-pressure (low-temperature) refrigerant in the evaporator into the compressor cylinder. The refrigerant vapor is compressed, and the pressure and temperature increase at the same time; the high-pressure and high-temperature refrigerant vapor is pressed to the condenser. In the condenser, the high-temperature refrigerant vapor exchanges heat with the relatively low-temperature cooling water or air. The heat of the refrigerant is taken away by the water or air and condensed, and the refrigerant vapor becomes liquid. This part of the liquid is then transported to the expansion valve, throttled by the expansion valve to become a low-temperature and low-pressure liquid and enter the evaporator; In the evaporator, the low-temperature and low-pressure refrigerant liquid absorbs the heat of the compressed air and vaporizes (commonly known as "evaporation"), and the compressed air is cooled and condensed into a large amount of liquid water; The refrigerant vapor in the evaporator is sucked away by the compressor, so that the refrigerant undergoes four processes in the system: compression, condensation, throttling, and evaporation, thus completing a cycle. See Figure 8-1 for the working process of the cold dryer.
Figure 8-1 Refrigerated dryer working process diagram
