What is the definition of a refrigerant flow? A refrigerant flow is a process in which a fluid, usually a gas, is used in a heat exchange system to transfer heat from one area to another. This process is vital to the operation of air conditioning and refrigeration systems. In the most common type of refrigeration system, the evaporator absorbs heat from the air in the area being cooled. The refrigerant then flows to the compressor, where it is pressurized and heated. From there, the hot, pressurized refrigerant flows to the condenser, where it is cooled and condensed back into a liquid. The cooled liquid refrigerant then flows back to the evaporator, completing the refrigerant flow cycle. This cycle is repeated continuously in order to maintain the desired temperature. Refrigerant flow is an important part of air conditioning and refrigeration systems, and it is essential for their efficient operation.