What does subcooling refer to?

Subcooling refers specifically to the process in which a liquid is cooled beyond its saturation point, meaning it is cooled to a temperature lower than its condensing temperature. This is a crucial concept in HVAC systems because subcooling helps ensure that all the refrigerant is in liquid form before it enters the expansion device. By preventing any vapor from entering the expansion device, the efficiency and effectiveness of the refrigeration cycle are enhanced, leading to better performance and reliability of the cooling system.

In addition, subcooling allows for maximized heat absorption in the evaporator coil, which is integral to the overall efficiency of air conditioning and refrigeration systems. When the refrigerant is gassed correctly and retains as much liquid state as possible, it improves the system's capacity and minimizes the risk of compressor damage due to lack of lubrication.