GWP, R32, R410A, POE, miscibility, lubricity
R410A, which has a high GWP (global warming potential) of roughly 2000, is widely used in refrigeration systems today. Various low GWP alternative refrigerants have been investigated as part of the effort to stop global warming. One such refrigerant, R32, offers an alternative that improves system performance without the need for significant changes to current systems. Moreover, its GWP is roughly 1/3 that of R410A. R32 is thus a very promising candidate to replace R410A. However, current refrigeration oils designed for use with R410A have poor miscibility with R32. In this paper, we report on solutions to the miscibility problem and the characteristics of refrigeration oils for R32 systems.