A review on oil retention characteristics in evaporator and suction line of vapor compression system

Abstract This paper discusses the oil retention characteristics in the evaporator and suction line in a vapor compression system. Oil retention in the components can lead to reduced compressor efficiency and potential breakdowns. Lubricant in the evaporator reduces heat transfer efficiency and increases pressure drop, particularly under high-quality conditions. However, lubricant can also have a beneficial effect by making refrigerant distribution in the evaporator better. Experimental studies on the critical mass flux for oil recovery and the measurement of oil retention in the suction line are presented, highlighting key findings. Additionally, prediction models for oil retention in both the evaporator and suction line are suggested and organized. Most of the refrigerants discussed in this paper have a high global warming potential (GWP), except for R1234yf and R32. Given the global focus on transitioning to low-GWP refrigerants, future research should target the oil retention characteristics in next-generation refrigerants.