What is the practical maximum compression ratio of a rotary screw compressor?

The practical maximum compression ratio of a rotary screw compressor is typically around 20:1. This means that the compressor can effectively increase the pressure of the refrigerant gas from its intake to a discharge pressure that is 20 times higher than the intake pressure. Rotary screw compressors are known for their efficiency and capability to handle high compression ratios due to their design, which allows for continuous, smooth operation.

At a 20:1 compression ratio, these compressors can deliver substantial energy savings and reliable performance in industrial refrigeration applications. While higher compression ratios may be theoretically possible, they often lead to efficiency losses, increased wear and tear, and potential operational issues. Therefore, 20:1 is accepted as the maximum practical limit for optimal performance and efficiency in most scenarios. This understanding is crucial when designing or working with refrigeration systems that use rotary screw compressors, ensuring that operators can make informed decisions based on the system's performance characteristics.