Abstract
Refrigeration oil is used for lubrication, sealing and cooling in refrigerant compressors, and mixing of the oil with refrigerant has complicated effects on operating characteristics of the compressor. In this study, we measured operating performance of a vane compressor under various conditions of oil supply, and the experimental results were analyzed in detail using a mathematical compressor model developed in our previous study. With increasing ratio of the oil mixed in the suction refrigerant, volumetric efficiency of the compressor increased at lower rotational speed because of decreased losses of leakage and heat transfer, and it decreased at higher rotational speed due to increased pressure drop in a suction port. On the other hand, indicated efficiency increased slightly with increasing oil rate due to the cooling effect of the oil.
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