Which compression ratio is characteristic of a screw compressor?

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Study for the RETA Ammonia Refrigeration Exam with our immersive quizzes and multiple choice questions. Each question offers hints and explanations to prepare you for the certification exam!

Multiple Choice

Which compression ratio is characteristic of a screw compressor?

Explanation:
A screw compressor handles gas in a continuous, trapping-and-compressing way as the two rotors mesh. This rotary positive-displacement action lets the gas be compressed to a relatively high pressure rise, giving a higher discharge-to-suction pressure ratio than many other compressor types. In practice, ammonia screw systems are commonly designed with a fairly large pressure ratio, around twenty to one, which is why twenty-to-one is seen as characteristic. The smaller ratios listed would be more typical of lighter-duty or different compressor configurations and don’t reflect the high, continuous compression capability of a screw unit.

A screw compressor handles gas in a continuous, trapping-and-compressing way as the two rotors mesh. This rotary positive-displacement action lets the gas be compressed to a relatively high pressure rise, giving a higher discharge-to-suction pressure ratio than many other compressor types. In practice, ammonia screw systems are commonly designed with a fairly large pressure ratio, around twenty to one, which is why twenty-to-one is seen as characteristic. The smaller ratios listed would be more typical of lighter-duty or different compressor configurations and don’t reflect the high, continuous compression capability of a screw unit.

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