What is called subcooling in a refrigeration system?

Before leaving the condenser, the refrigerant is cooled to a temperature below the temperature to which it has condensed. This is called subcooling, calculated by the temperature difference between the condensing temperature and the coolant temperature in the liquid line. This process occurs at the outlet of the condenser, where, after complete condensation of the refrigerant gas, the temperature of this liquid is reduced to ensure that the subcooling liquid expansion valve is inlet. Thus, loss of performance of the refrigeration system will be prevented by the undesirable presence of instantaneous evaporation of the liquid in the liquid line.