What is the function of a purge unit in a chiller system?

The function of a purge unit in a chiller system is primarily to relieve non-condensable gases from the system to the atmosphere. Non-condensable gases, which may include air and other gases that do not condense under normal operating conditions, can accumulate within the chiller. This accumulation can reduce the overall efficiency of the system by increasing the pressure in the condenser and affecting the heat exchange process.

By continuously or periodically removing these non-condensable gases, the purge unit helps maintain optimal conditions within the chiller, allowing it to operate more efficiently and effectively. This function is crucial because if non-condensables are not removed, they can lead to increased power consumption, reduced cooling capacity, and potential damage to the compressor and other components.

While options such as increasing condenser efficiency or enhancing compressor performance may seem relevant, they are indirectly influenced by the purge unit’s main role, which is to manage the presence of non-condensable gases. Absorbing excess heat, on the other hand, is a function related to the refrigerant and heat transfer processes, not directly associated with a purge unit's purpose.