What is the primary purpose of the surge drum in a flooded system?

The primary purpose of the surge drum in a flooded system is to regulate refrigerant levels. In a flooded evaporator system, the surge drum serves as a reservoir that helps maintain a consistent level of refrigerant. This is crucial for ensuring efficient operation and preventing oil carryover into the system, which could lead to decreased performance or equipment damage.

By allowing excess refrigerant to be temporarily stored, the surge drum ensures that the evaporator is always supplied with an adequate amount of refrigerant to absorb heat, while also accommodating fluctuations in loading conditions. This regulation aids in stabilizing the refrigerant flow, promoting optimal heat transfer, and ultimately enhancing the overall efficiency of the refrigeration system.