Which process occurs in the evaporator coil?

In the evaporator coil, the primary process that occurs is the absorption of heat by the refrigerant, which causes it to evaporate. During this stage, the refrigerant enters the evaporator coil as a low-pressure liquid. As air from the surrounding environment is blown over the coil, the refrigerant absorbs heat from the air, leading to a temperature increase.

As the refrigerant absorbs this heat energy, it undergoes a phase change and transforms from a liquid state to a gaseous state. This evaporation process is essential for producing the cooling effect that air conditioning systems are designed to achieve. The refrigerant, now in vapor form, continues its journey through the system to the compressor, where it is then compressed and cycled back through the system.

Understanding this process highlights the fundamental function of the evaporator coil in an air conditioning system, which is to facilitate heat transfer and create a comfortable indoor environment.