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Thermodynamic Properties of 3,3,3-Trifluoropropene and Polyol Ester Lubricant Mixtures.

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Title: Thermodynamic Properties of 3,3,3-Trifluoropropene and Polyol Ester Lubricant Mixtures.
Authors: Sun, Yanjun1 (AUTHOR) sunyanjun@xjtu.edu.cn, Zheng, Haiqi1 (AUTHOR), Guo, Daoyi1 (AUTHOR), Qin, Gengguang1 (AUTHOR), Xin, Dianbo2 (AUTHOR), Gao, Rongkun2 (AUTHOR), Liu, Xinyi2 (AUTHOR), Gang, Chang3 (AUTHOR), Wang, Xiaopo4 (AUTHOR), He, Maogang4 (AUTHOR)
Source: International Journal of Thermophysics. Mar2026, Vol. 47 Issue 3, p1-27. 27p.
Subjects: Solubility, Dynamic viscosity, Thermodynamics, Refrigerants, Phase equilibrium, Synthetic lubricants, Liquid density, Refrigeration & refrigerating machinery
Abstract: This study investigates the thermophysical characteristics of binary mixtures involving the low-global warming potential refrigerant 3,3,3-trifluoropropene (R-1243zf) and two polyol ester (POE) lubricants (RL 32 and RL 68). Experimental measurements of solubility, liquid density, and dynamic viscosity were conducted over a temperature range of 298–353 K. These outcomes imply that R-1243zf exhibits complete miscibility with both POE oils across the studied conditions, with higher solubility observed in POE RL 32 compared to POE RL 68. The dissolution of R-1243zf significantly reduces the flow characteristics of the lubricants, particularly in the oil-rich phase, while its effect on liquid density is relatively minor. A satisfactory correlation of the phase equilibrium data was achieved with the non-random two-liquid model, and mixture densities and viscosities were accurately represented using an excess-property approach combined with Redlich–Kister expansions. Additionally, Daniel charts were constructed to illustrate the viscosity–pressure–temperature–concentration relationships for both mixtures, providing practical guidance for the selection of lubricating oils in R-1243zf-based refrigeration systems. The findings suggest that POE RL 68 offers better viscosity retention under high-temperature conditions, making it more suitable for severe operating environments. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:This study investigates the thermophysical characteristics of binary mixtures involving the low-global warming potential refrigerant 3,3,3-trifluoropropene (R-1243zf) and two polyol ester (POE) lubricants (RL 32 and RL 68). Experimental measurements of solubility, liquid density, and dynamic viscosity were conducted over a temperature range of 298–353 K. These outcomes imply that R-1243zf exhibits complete miscibility with both POE oils across the studied conditions, with higher solubility observed in POE RL 32 compared to POE RL 68. The dissolution of R-1243zf significantly reduces the flow characteristics of the lubricants, particularly in the oil-rich phase, while its effect on liquid density is relatively minor. A satisfactory correlation of the phase equilibrium data was achieved with the non-random two-liquid model, and mixture densities and viscosities were accurately represented using an excess-property approach combined with Redlich–Kister expansions. Additionally, Daniel charts were constructed to illustrate the viscosity–pressure–temperature–concentration relationships for both mixtures, providing practical guidance for the selection of lubricating oils in R-1243zf-based refrigeration systems. The findings suggest that POE RL 68 offers better viscosity retention under high-temperature conditions, making it more suitable for severe operating environments. [ABSTRACT FROM AUTHOR]
ISSN:0195928X
DOI:10.1007/s10765-026-03708-8