Influence of Lubricant on the Nucleate Boiling Heat Transfer Performance of Refrigerant—A Review

A study on an online measurement method to determine the oil discharge ratio by utilizing Coriolis mass flow meter in a calorimeter

“…The discharged lubricating oil circulates with the refrigerant and has a significant impact on refrigerant evaporation heat transfer performance because oil changes the refrigerant thermal and transport properties, such as saturated temperature, density, viscosity, thermal conductivity, etc. Prior investigations showed that the effect of oil circulation might enhance refrigerant heat transfer in lower oil concentration and deteriorate heat transfer at higher oil concentration Wang et al, 2014). Related research results of flow pressure drop characteristic indicate that the presence of oil always increases flow frictional pressure drop Han and Lee, 2005;Shen and Groll, 2005).…”