The liquid refrigerant enters the evaporator under low pressure and temperature, absorbs heat from the air circulating through the fins by forced convection and vaporizes, this air in turn draws heat from the food or medium to be refrigerated.
Thereafter the fluid is sucked from the interior of the evaporator in the vapor state at low pressure and temperature by the compressor via the suction line. The compressor compresses the refrigerant by describing a practically isentropic process and discharges it in the condenser through the discharge line, at a much higher pressure and temperature, the refrigerant begins its process of heat rejection, that is, it begins to release heat to the external medium until reaching the pressure and condensation temperature, from the gaseous state to the liquid state.
From the outlet of the condenser, where it is desired that the fluid exits completely in the liquid phase, the fluid flows into the liquid tank, where condensate accumulates at the bottom and through a pipe called a fisherman it exits the tank completely in the liquid phase following through the liquid line passing through the dryer filter, liquid display still releasing heat to the external environment, it is said that the fluid is undercooling, until reaching the expansion valve or capillary tube (responsible for decompression) of the refrigerant, taking it from the condensation pressure to the evaporation pressure.
At the outlet of the evaporator inlet, the refrigerant undergoes a drop in temperature and pressure, and then expands to the vapor phase again by withdrawing heat from the internal environment and restarting its refrigeration process.
