Expected efficiency of a compressor must be used in engineering calculations as it is not possible to predict head losses in a flow path. Various aspects of efficiency application (flow parameters in control planes definition, power consumption calculation) are shortly discussed. Presented samples show errors of different compressors comparison if inappropriate adiabatic efficiency is applied. The "real" efficiency based on calculation of head losses in elements of a flow path is presented. The "real" efficiency calculated by the Universal modeling method (1,7)) is compared with usual total polytropic efficiency.
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