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In most of the refrigeration systems a small quantity of oil is carried out of the compressor by high velocity vapor leaving the compressor discharge in the form of a mixture with the refrigerant. The circulating liquid which is a mixture of oil and refrigerant has the highest viscosity in the suction line to the compressor due to which it has the highest potential for oil retention. R1234yf is a new alternative refrigerant of low global warming potential (GWP) which has been developed for automobile air conditioners as a drop-in replacement for R134a in order

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