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<p>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&#xa0;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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Yanjun Sun,
  • Haiqi Zheng,
  • Daoyi Guo,
  • Gengguang Qin,
  • Dianbo Xin,
  • Rongkun Gao,
  • Xinyi Liu,
  • Chang Gang,
  • Xiaopo Wang,
  • Maogang He

摘要

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.