What does "subcooling" mean in refrigeration terms?

Subcooling in refrigeration refers to the process of cooling the refrigerant below its saturation temperature while it remains in the liquid phase. This is an important concept because it enhances the efficiency of the refrigeration cycle. When the refrigerant is subcooled, it ensures that all of the refrigerant is in a liquid state before it enters the expansion valve or device. This helps in preventing issues such as flash gas formation, which can adversely affect the efficiency of the cooling process and potentially harm the compressor.

Subcooling boosts the system's capacity and performance since it maximizes the amount of heat that can be absorbed in the evaporator. By utilizing the liquid refrigerant effectively, it supports the overall efficiency and reliability of the refrigeration system.