The components of a refrigeration system under evaporator pressure are referred to as what?

In a refrigeration system, the components that operate under evaporator pressure are referred to as the low side. The low side of the system includes the evaporator and the associated components. In this section, the refrigerant absorbs heat from the environment, which causes it to evaporate and change from a liquid to a gas.

Understanding the low side is crucial for technicians, as this is where the refrigerant is in its low-pressure, low-temperature state after it has passed through the evaporator. Monitoring and managing the low side pressure is vital for the efficiency and performance of the refrigeration system. The components and processes located in the low side directly relate to the system's cooling capacity and effectiveness, making this concept fundamental in the maintenance and troubleshooting of refrigeration units.

The other choices relate to different parts of the refrigeration cycle. The high side refers to the area where the refrigerant is compressed and is at a higher pressure after leaving the compressor. The medium side does not typically refer to any recognized section of the refrigeration system in standard terminology. The expansion side generally indicates the area where the refrigerant expands, which occurs between the high side and low side, but does not encompass all components under evaporator pressure.