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Journal Article
Under Pressure
2025
Overview
Pearson considers a few aspects of positive displacement compressors, meaning those that work by reducing the volume of a trapped quantity of gas. There are two key numbers that describe the performance of a positive displacement compressor: the isentropic efficiency and the volumetric efficiency. When talking about \"the efficiency\" of a compressor it is important to know which one is being discussed. They are as different as \"miles\" and \"gallons\"--both contribute to the miles per gallon figure for your car, but it doesn't make sense to say how many gallons you drive to work each day or how many miles you bought at the gas station. The isentropic efficiency is a measure of how well the compressor performs compared to an ideal machine and is defined as the work done in an ideal machine (when there is no increase in entropy) divided by the work done in the actual machine (where irreversible losses such as friction and turbulence cause the entropy to increase).
Publisher
American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc
Subject
