Abstract
R1234yf and R1234ze(E) as green refrigerants have attracted wide attention. Phase behavior of refrigerant/oil and oil circulating mass fraction are critical to the performance and reliability of refrigeration systems. Using isochoric saturation method, the solubilities were measured for R1234yf and R1234ze(E) in POE75 from 278.15 to 348.15 K. The pressure–enthalpy–vapor quality diagrams for pure refrigerants (R1234yf and R1234ze(E)) and refrigerant/oil mixtures (R1234yf/POE75 and R1234ze(E)/POE75), with various oil circulating mass fractions, are presented where the solubility is correlated by the NRTL model and the enthalpy of the refrigerant/oil is calculated by the model reported by Youbi-Idrissi. The enthalpy of refrigerant/oil, enthalpy change ratio and non-evaporated quantity were analyzed at different oil circulating mass fractions and superheats. The results show that the enthalpies of refrigerant/oil are always lower than those of pure refrigerant under various oil cycle mass fractions. The enthalpy change ratio increases with the increase of superheat and decreases with the increase of oil circulating mass fraction. The non-evaporated quantity decreases with the increase of superheat and increases with the increase of oil circulation mass fraction.
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