What is the typical temperature change for sizing suction lines?

The typical temperature change for sizing suction lines is commonly considered to be 2 degrees. This value is significant because it strikes a balance between ensuring that the refrigerant maintains its efficiency while minimizing the risk of phase changes that could lead to liquid refrigerant reaching the compressor.

When sizing suction lines, accurate calculations are essential for the proper operation of the refrigeration system. The 2-degree temperature change allows technicians to account for potential heat gains that the refrigerant might experience as it flows through the suction line. This ensures that by the time the refrigerant reaches the compressor, it is still in a gaseous state, thereby preventing issues such as liquid slugging, which can damage the compressor.

Choosing a smaller temperature change, such as 1 degree, may not be sufficient to cater to the variations in conditions, while a larger change of 5 or 10 degrees could result in the refrigerant not adequately returning to the compressor as a gas, leading to inefficiencies or system failures. Thus, 2 degrees is an industry-standard guideline that reflects optimal conditions for the operation of the system.