Why is a suction accumulator recommended downstream of a low temperature coil?

A suction accumulator is recommended downstream of a low temperature coil primarily to prevent liquid slugging. In refrigeration systems, particularly those operating at low temperatures, there is a risk that liquid refrigerant may not fully vaporize before returning to the compressor. If this liquid refrigerant enters the compressor, it can cause mechanical damage due to liquid slugging, where the liquid refrigerant interferes with the normal operation of the compressor.

The suction accumulator serves as a storage device that allows any liquid refrigerant to collect and vaporize before it reaches the compressor, ensuring that only vapor enters the compressor. This is especially important in low temperature applications where the refrigerant may not vaporize completely due to the lower thermal energy available. By managing the refrigerant flow in this way, the suction accumulator plays a crucial role in maintaining system efficiency and longevity, preventing sudden pressure fluctuations and improving overall reliability of the refrigeration system.