Pic. 8.78. Evaporator pre-cooling cycle diagram: 1 – multiflow evaporator; 2 – condensation element; 3 - gaseous refrigerant; 4 - liquid refrigerant; 5 - modulator; 5 - supercooling element
In the adopted pre-cooling cycle (pic. 8.78), after the refrigerant passes through the condensing element of the evaporator, the liquid and gaseous refrigerant that could not be liquefied is cooled again in the subcooling element. Thus, the refrigerant is sent to the evaporator in an almost completely liquefied state.
Note. The point at which air bubbles disappear in the refrigerant of the subcooling cycle is lower than the corresponding amount of refrigerant with which the system must be filled. Therefore, if the system is recharged with refrigerant at the point where air bubbles disappear, the amount of refrigerant will be insufficient. As a result, this will affect the performance of the system.