Abstract
Refrigeration oil is used for lubrication, sealing and cooling in refrigerant compressors, and mixing of the oil with refrigerant has great influences on compression characteristics in the compressors. In the past there were some studies in which the effect of the oil on the compressor performance was analyzed theoretically, but most of them did not discuss well the propriety of the oil treatment in the analysis. In this study, we developed the mathematical compressor model including the effect of the oil on leakage, heat transfer and flow resistance in vane compressors and examined the influence of the ways of treating the oil on the calculated results. When the model employed a quality of two-phase leakage flow equal to that in the compression chamber and a coefficient of heat transfer reflecting thermophysical properties of the oil and the refrigerant, it showed better agreement with experimental results.
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