The suction line should be sized so that the maximum pressure drop equals a saturation temperature drop of how many degrees Fahrenheit?

The correct sizing of the suction line is crucial in refrigeration and air conditioning systems, as it affects the efficiency and performance of the system. When determining the appropriate maximum pressure drop in the suction line, it is standard practice to allow for a saturation temperature drop of no more than 2 degrees Fahrenheit. This guideline ensures that the refrigerant remains adequately vaporized, preventing potential flooding or liquid slugging in the compressor, which can lead to significant operational issues.

Exceeding this temperature drop can result in a higher likelihood of refrigerant entering the compressor in a liquid state rather than as a vapor, causing mechanical damage and reducing system efficiency. Therefore, adhering to the 2-degree Fahrenheit maximum saturation temperature drop provides a balance between minimizing pressure loss and maintaining the integrity of the refrigerant phase, which is vital for effective thermal exchange in the system.