In a two-stage refrigeration system, what is the first stage compressor called?

In a two-stage refrigeration system, the first stage compressor is referred to as the "booster" compressor. This is because its primary purpose is to increase the pressure of the refrigerant vapor from the evaporator stage to a level that is suitable for the second stage of compression. By doing so, it enables the refrigerant to be efficiently further compressed in the second stage compressor to reach the desired condensing pressure.

The terminology "booster" specifically indicates its role in enhancing the overall efficiency of the refrigeration cycle by ensuring that the refrigerant moves smoothly through the stages of the system. The booster compressor typically handles lower pressures and temperatures compared to the second stage, which works at a higher pressure. This two-stage process is particularly important in achieving lower temperatures efficiently, as it allows for more effective thermal management.

Other terms listed, such as standby, low volume, and extraction, do not accurately describe the component's role and function in a two-stage refrigeration system. Standby usually refers to backup systems, low volume does not provide a specific mechanic for stages of compression, and extraction may relate to processes involving the removal of substances rather than compression functionality.