Compositional Change Behavior of R 1132(E) Refrigerant Mixture in the Presence of Refrigeration Oil

－Compositional Change of R 474A in the Presence of Refrigeration Oil PVE－

Abstract

A study was conducted to quantify the amount of refrigerant dissolved in refrigeration oil for the purpose of estimating the composition change of mixed refrigerants that are non-azeotropic in an air-conditioner. In the case of a binary non-azeotropic mixture of R 1132(E) [trans-1,2-difluoroethylene] and R 1234yf, R 1234yf preferentially dissolves in the refrigeration oil, and the amount of R 1234yf dissolved in the refrigeration oil was estimated as the temperature and pressure increased. It was found that the ratio of R 1132(E) in the mixed refrigerant composition tended to increase relative to the inclusion composition as the temperature decreased and the pressure increased.