What factors affect the efficiency of compressors?

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The discussion focuses on the efficiency comparison between rotary vane compressors and bellow compressors, specifically regarding their isentropic efficiency. Factors that reduce isentropic efficiency include heat transfer, friction, and leakage, which lead to increased power requirements beyond ideal conditions. The conversation also touches on the implications of approaching isothermal compression, suggesting that power requirements decrease as the process becomes more isothermal. Understanding these factors is crucial for optimizing compressor performance in various applications. Overall, the efficiency of compressors is influenced by their design and the thermodynamic processes involved.
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given the same volume and rate of air flow, which would be more efficient compressor between a rotary vane compressor and a bellow?
 
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Hi chhitz. What do you mean by a bellow compressor? I've heard of compressors that use edge welded bellows as the sealing and compressing mechanism, is that what you're referring to?

Regardless of what kind of compressor you refer to, let me also ask you, what do you think the various factors are that reduce isentropic efficiency? Note that a reduction in isentropic efficiency generally implies an increase in power required over and above that for a perfectly isentropic compression.

Alternatively, we might recognize that some compression processes are closer to isothermal, in which case, what do you think happens to the power required to compress a given gas a given dP and a given mass flow rate as you approach the isothermal case?
 

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