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The use of an MHV-2 equation of state for modelling the thermodynamic properties of refrigerant mixtures.

Author(s) : MORRISON J. D., BARLEY M. H., MURPHY F. T., PARKER I. B., WHEELHOUSE R. W.

Summary

This paper reports on the development and application of a thermodynamic model based on the second order Modified Huron Vidal equation of state (MHV-2) to predict the properties of ternary mixtures of the refrigerants R32, R125 and R134a. The mixing rules of this equation of state have been used to incorporate directly an activity coefficient model for the excess Gibbs free energy. The parameters for the activity coefficient model have been derived from experimental VLE data for binary mixtures This methodology has enabled the production of a thermodynamically consistent model which can be used to predict the phase equilibria of R32/R125/R134a mixtures The input data used in the model are presented in the paper and the predictions of the model are compared with available experimental data. The thermodynamic model has been used to predict the behaviour of ternary refrigerant blends of R32/R125/R134a in fractionation scenarios, such as liquid charging and vapour leakage, which are of direct interest to the refrigeration industry. Details of these applications and comparisons with experimental data are discussed along with other general uses of the thermodynamic model.

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Pages: p 461-469

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Details

  • Original title: The use of an MHV-2 equation of state for modelling the thermodynamic properties of refrigerant mixtures.
  • Record ID : 30034022
  • Languages: English
  • Subject: Technology
  • Source: CFCs, the Day After.
  • Publication date: 1994
  • Document available for consultation in the library of the IIR headquarters only.

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