An Experimental Study on Oil Return of PAG and POE from an Evaporator Model for a CO2 Refrigeration System

Lubricant oil is needed in air conditioning and refrigeration system because the compressor requires it to prevent surface-to-surface contact between its moving parts, to remove heat, to provide sealing, to keep out contaminants, to
prevent corrosion, and to dispose of debris created by wear. The present study has been carried out to select the suitable refrigeration oil for a CO2 refrigeration system. The oil return is one of the most important characteristics
for refri

Lubricant oil is needed in air conditioning and refrigeration system because the compressor requires it to prevent surface-to-surface contact between its moving parts, to remove heat, to provide sealing, to keep out contaminants, to
prevent corrosion, and to dispose of debris created by wear. The present study has been carried out to select the suitable refrigeration oil for a CO2 refrigeration system. The oil return is one of the most important characteristics
for refrigeration oils. PAG and POE oils are considered as a test fluids in this study. An evaporator model is employed to simulate the evaporator of a CO2 refrigeration system. Oil return characteristics has been investigated for CO2/PAG and CO2/POE mixtures in the range of oil concentration 0 to 5 weight-percent and the mixture temperature range of 0°C to 15°C and the mass flow rate range of 1.4 kg/min to 2.0 kg/min. The results obtained indicate that oil return is decreased with an increase in the oil concentration and mixture temperature for both POE and PAG oils. It is also found that oil return is increased as the mass flow rate is increased for both oils. As a result, POE oil is seen to be superior to PAG oil in terms of oil return in an evaporator of a CO2 refrigeration system.


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