Which system style utilizes a liquid pump to transfer liquid to evaporators?

The overfeed system style is characterized by its use of a liquid pump to transfer liquid refrigerant to evaporators. This system works by pumping an excess of liquid refrigerant to the evaporators, ensuring that they remain adequately supplied with refrigerant despite varying operating conditions. The design allows for a consistent flow of refrigerant that can enhance efficiency and maintain proper temperature levels during operation.

In this system, the pump's function is crucial as it helps to ensure that the refrigerant reaches the evaporators in the required quantities, therefore maximizing the heat absorption process. This direct transfer of liquid enhances the performance of the cooling system, especially in large-scale applications.

Other options may refer to different methods of managing refrigerant flow but do not specifically describe a method that continuously pumps liquid refrigerant to the evaporators. For instance, a direct expansion system typically allows the refrigerant to expand directly in the evaporator without the need for a pump, while constant pressure and variable speed refer to control strategies rather than pumping methods. Hence, the unique aspect of the overfeed system is its active pumping mechanism, which distinctly sets it apart.