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A fundamental equation of state for lubricant-refrigerant mixtures with optimization based on transport and interfacial properties.

Number: pap. n. 476

Author(s) : GÖPFER T., THOMAS C., HESSE U.

Summary

For the optimization of refrigeration components the thermophysical properties of the lubricant refrigerant mixtures are needed. Most often semi-empirical equations of state are used which are often developed under strict boundary conditions as more generic equations of state for lubricant refrigerant mixtures are not available. This paper shows an approach to develop a fundamental equation of state based on the reduced Helmholtz energy to describe the thermodynamic properties of lubricant refrigerant mixtures. In a new approach, the viscosity and the interfacial tension of the mixtures of lubricant and refrigerant are used for the optimization of the structure and the coefficients of the equations of state. For this purpose the residual entropy viscosity scaling and empirical equations for the interfacial tension are used. Based on this equation also properties like heat capacities of the mixture and the theoretical solubility of the lubricant diluted in the gas phase, which are difficult to measure, can be determined.

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Details

  • Original title: A fundamental equation of state for lubricant-refrigerant mixtures with optimization based on transport and interfacial properties.
  • Record ID : 30025998
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.0476

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