Acoustic determination of thermophysical properties and critical parameters for the mixture (51 wt % R143a + 49 wt % R125) and critical line of xCO 2 + (1 - X)(51 wt % R143a + 49 wt % R125)

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Abstract

The thermophysical properties and critical parameters for the alternative refrigerant (51 wt % of 1,1,1 -trifluoroethane (R143a) + 49 wt % of pentafluoroethane (R125))-very close to the composition of R507 (50 wt % of each mixture component)-were investigated using two different acoustic techniques. The critical behavior of the system xCO2 + (1 - x)(51 wt % R143a + 49 wt % R125) was also investigated. Experimental data of speed of sound in liquid (51 wt % R143a + 49 wt % R125) from T= (253 to 338) K and pressures up to 65 MPa were measured using a pulse-echo method. Derived thermodynamic properties were calculated, combining our experimental data with density and isobaric heat capacity values published by other authors. Measurements of the critical temperature Tc and pressure pcon (51 wt % R143a + 49 wt % R125) and mixtures of xCO2 + (1 - x)(51 wt % R143a + 49 wt % R125) were performed using another simple ultrasonic time-delay technique. The binary critical line was determined over the whole composition range showing that this system deviates only slightly from ideality since the critical line is a continuous line. The Peng-Robinson equation of state with conventional mixing and combining parameters was used to correlate the binary experimental data.

Original languageEnglish
Pages (from-to)2161-2169
Number of pages9
JournalJournal of Chemical and Engineering Data
Volume51
Issue number6
DOIs
Publication statusPublished - 1 Nov 2006

Keywords

  • Equations of state
  • Refrigerants
  • Mixing rule

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