Compressor Efficiency Definitions
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Many standard efficiency definitions exist that qualify the mass flow and power performance characteristics of a compressor. These different definitions are often used interchangeably throughout the compressor industry, although each is based on fundamentally different assumptions. This often results in incorrect comparisons between compressors offered by different companies, which precludes the customer from obtaining a fair and accurate assessment of their compressor needs. Here, we present a brief description of some efficiency definitions to aid in understanding differences between them. To do so we first introduce a simple theoretical thermodynamic model of the compressor, and characterize its states during operation. Theoretical massflow equations are then presented, and theoretical compressor work are power are obtained. Next, power definitions, taken from standard thermodynamics texts and industry usage, are defined and discussed. Finally, these powers are used to define compressor efficiencies and recommendations are provided regarding their use, including which efficiency definitions are used by Vairex when characterizing compressors.
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