Why is it essential to run the suction and liquid lines in physical contact with one another?

Running the suction and liquid lines in physical contact with one another is critical for sub-cooling the refrigerant in the liquid line. When these lines are in close proximity, the warm vapor in the suction line can transfer heat to the liquid line. This heat exchange allows the refrigerant in the liquid line to cool further before it enters the expansion device or evaporator.

Sub-cooling is an important aspect of refrigeration system efficiency because it ensures that the refrigerant remains in its liquid state and does not enter the evaporator as a mixture of liquid and vapor. By promoting a state of complete liquid refrigerant, the system can operate more efficiently, improve cooling capacity, and prevent potential damage to the compressor from liquid slugging.

This process plays a significant role in maintaining system performance, including compressor efficiency and reducing the risk of liquid refrigerant loss, but the primary function of having the lines in contact is to achieve more effective sub-cooling of the liquid refrigerant.