Which statement is true about a suction line accumulator?

The statement regarding a suction line accumulator that includes an internal sub-cooling coil is accurate because sub-cooling helps in maximizing the efficiency of the refrigeration system. The accumulator's primary role is to store excess refrigerant vapor and manage the flow of refrigerant entering the compressor. By including an internal sub-cooling coil, the accumulator can enhance the cooling of the refrigerant, ensuring that it is at a lower temperature before it reaches the compressor. This process can also reduce the risk of liquid refrigerant entering the compressor, which is critical for avoiding potential damage.

The presence of an internal sub-cooling coil is an important feature that improves the thermal efficiency of the system by allowing for additional heat transfer before the refrigerant is compressed. This assists in maintaining optimal operating conditions and improves overall system performance.