Screw Compressor: Explained in detail

Raising the air pressure raises the temperature, which in turn raises the fluid's entropy.
Energy loss is quantified by entropy. As comparison to a theoretical compressor, a practical compressor needs to put in more effort to raise air pressure to the same outlet pressure.
Yet, the level of compression is not the only factor. A compressor depends on the effectiveness of the airend and the compression chamber, but its overall energy consumption also depends on various losses and component efficiencies that are part of the package.
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