In the case of excessive liquid feed supply to the evaporator, what action should be taken?

When there is an excessive liquid feed supply to the evaporator, one effective action to take is to re-adjust the back pressure regulator (BPR). The BPR is crucial for maintaining appropriate pressure levels within the evaporator system. By adjusting the BPR, you can help control the flow of refrigerant, ensuring that the evaporator operates efficiently and is not overwhelmed by an excessive liquid supply.

This adjustment allows the evaporator to better manage the liquid-to-vapor phase transition, preventing flooding and ensuring that the evaporator can maintain optimal thermal performance. If the system is allowed to operate with too much liquid feed, it can lead to inefficiencies, reduced heat exchange, and possible damage to the equipment.

Taking this action is generally more effective than shutting down other components of the system, such as the condenser or the compressor, as it directly addresses the issue of the liquid imbalance without potentially causing further disruptions in the refrigeration cycle. Thus, re-adjusting the BPR is a targeted response to manage excessive liquid feed entering the evaporator.