In refrigeration terminology, what is the purpose of the suction line?

The suction line plays a crucial role in the refrigeration cycle by transporting low-pressure, low-temperature vapor refrigerant from the evaporator back to the compressor. This is essential for maintaining efficient system operation, as the compressor relies on this vapor to function properly. By drawing in the refrigerant, the compressor is able to increase its pressure and temperature before passing it on to the condenser for cooling. The effectiveness of the refrigeration system heavily depends on this process, as it ensures that the refrigerant continuously circulates throughout the system, facilitating heat transfer and cooling.

While other components in the system have specific functions—such as removing moisture or discharging vapor—the primary function of the suction line is to supply the compressor with refrigerant that has absorbed heat from the conditioned space.