In refrigeration, what does purging refer to?

Purging in refrigeration specifically refers to the process of removing non-condensables from the system. Non-condensables are gases that do not change state (i.e., do not condense) under the operating conditions of the refrigeration system, such as air or other contaminants. The presence of these non-condensables can significantly affect the efficiency of the refrigeration cycle, leading to reduced cooling capacity and increased energy consumption. Therefore, purging is critical to maintain the system’s performance and to ensure proper heat exchange.

The process typically involves using a dedicated purging device or valve that allows these unwanted gases to be safely expelled from the refrigeration circuit while preserving the refrigerant, allowing for optimal operation of the system.