Abstract
Influence of the refrigerant thermodynamic properties on the characteristics of centrifugal compressors is investigated. Peculiarities of centrifugal compressors working with various refrigerants are defined and the range of priority application is determined. Interdependence between centrifugal stage pressure ratio, peripheral Mach number and impeller peripheral speed, as well as the influence of the refrigeration capacity on the dimensions of centrifugal compressors are determined to obtain the range of reasonable usage of R718 refrigeration/heat pump systems. Deep vacuum operating conditions, low specific volumetric cooling capacity of R718, and small molecular mass of water are the peculiarities that determine the main parameters of the water (R718) centrifugal compressors and the range of rational application of the R718 centrifugal refrigeration/heat pump systems. The high peripheral impeller speed, high Mach number, and high pressure ratio cause separated jet-wake flow and transonic flow phenomena in the compressor flow field.
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