What does a suction accumulator do in rotary compressors?

• A. Compress refrigerant
• B. Ensure high efficiency
• C. Prevent refrigerant loss
• D. Store excess refrigerant

Answer: (B)

In a rotary compressor system, the suction accumulator plays a critical role in maintaining high efficiency by managing the refrigerant flow and ensuring that only vapor enters the compressor. Its main function is to collect excess refrigerant that may be liquid during operation, which could harm the compressor if taken in directly.

When the evaporator is not delivering enough vapor to the compressor, the suction accumulator allows for temporary storage of refrigerant vapor, ensuring that the compressor receives a steady and sufficient flow of vaporized refrigerant. By doing so, it helps to prevent compressor damage that can occur from liquid refrigerant entering the compressor's combustion chamber, which can lead to issues such as hydraulic lock-up.

Thus, the primary purpose of the suction accumulator is aligned with ensuring high efficiency through maximizing the proper operation of the compressor while enhancing the overall refrigeration cycle. This is why the selected answer is correct in this context.