Measurements of saturation densities in critical region and critical loci for binary R-32/125 and R-125/143a systems

G. Kishizawa, H. Sato, K. Watanabe

Research output: Contribution to journalArticle

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Abstract

R-32/125 (difluoromethane/pentafluoroethane) and R-125/143a (pentafluoroethane/1,1,1-trifluoroethane) binary systems are promising alternative refrigerants to replace conventional refrigerants, i.e., R-22 and R-502. The saturated vapor- and liquid-density data in the critical region of these mixtures were measured using the visual observation of the meniscus disappearance in an optical cell. For the R-32/125 system, 35 saturation density data were measured at three compositions, 10, 35, and 50 mass% R-32. Nineteen saturation density data were also measured for R-125/143a (50/50 mass%). The critical temperatures and densities for these binary refrigerants were determined by taking into consideration the level and location of the meniscus disappearance as well as the intensity of the critical opalescence. Correlations to represent the critical loci of these binary refrigerants for an entire range of compositions have been developed. The experimental uncertainties of the saturation density data are estimated to be within 9 mK in temperature and 0.5 to 5.0 kg · m-3 in density. The uncertainties of the critical temperature and density are estimated to be within 12 to 14 mK and 4 to 8 kg · m-3, respectively.

Original languageEnglish
Pages (from-to)923-932
Number of pages10
JournalInternational Journal of Thermophysics
Volume20
Issue number3
Publication statusPublished - 1999 May

Fingerprint

Refrigerants
loci
saturation
refrigerants
menisci
Density of liquids
Density of gases
Chemical analysis
critical temperature
Temperature
opalescence
visual observation
vapors
liquids
pentafluoroethane
Uncertainty
cells

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Physical and Theoretical Chemistry
  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy (miscellaneous)

Cite this

Measurements of saturation densities in critical region and critical loci for binary R-32/125 and R-125/143a systems. / Kishizawa, G.; Sato, H.; Watanabe, K.

In: International Journal of Thermophysics, Vol. 20, No. 3, 05.1999, p. 923-932.

Research output: Contribution to journalArticle

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