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Composition dependence of the critical parameters for the binary mixtures of R32 + R290, R32 + R600a, and R290 + R600a system.

Author(s) : HIGASHI Y.

Summary

The composition dependence of the critical parameters, i.e., critical temperature, critical density, and critical molar volume for three kinds of the binary mixtures of the difluoromethane (R32) + propane (R290) system, the difluoromethane (R32) + isobutane (R600a) system, and the propane (R290) + isobutane (R600a) system is discussed. The critical parameters of these mixtures were determined from the experimental results of the vapour-liquid coexistence curve in consideration of the meniscus disappearance level as well as the intensity of the critical opalescence. Especially, as for the R32 + R600a system, not only the vapour-liquid coexistence curve but also the critical parameters are newly measured. On the basis of the experimental data, the correlation of the composition dependence of the critical locus is formulated. The correlation includes the individual adjustable parameters for each systems. In this study, the relationships between these adjustable parameters is also discussed.

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Pages: 2005-3

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Details

  • Original title: Composition dependence of the critical parameters for the binary mixtures of R32 + R290, R32 + R600a, and R290 + R600a system.
  • Record ID : 2006-0541
  • Languages: English
  • Source: Commercial Refrigeration. Thermophysical Properties and Transfer Processes of Refrigerants. Proceedings of the IIR International Conferences.
  • Publication date: 2005/08/02

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