What does the compressor's suction line do?

The function of the compressor's suction line is to draw vapor refrigerant from the evaporator back to the compressor. In a refrigeration system, the evaporator absorbs heat from the environment and causes the refrigerant inside it to evaporate, turning it into low-pressure vapor. The suction line serves as the pathway for this vapor to travel back to the compressor, where it will be compressed and sent to the condenser. This cycle is essential for the continued operation of the refrigeration system, as it allows the refrigerant to absorb heat efficiently and maintain the cooling effect in the evaporator.

The other choices pertain to other aspects of the refrigeration cycle. For instance, releasing refrigerant into the evaporator pertains to the expansion device, which allows liquid refrigerant to enter the evaporator. The supply of cool refrigerant to the system typically describes the function of the condenser, where the refrigerant is condensed after being compressed. Finally, the process of condensing the refrigerant takes place in the condenser itself, where the vapor refrigerant is transformed back into liquid.