Acoustic determination of thermophysical properties and critical parameters for R410A and critical line of xCO(2)+(1-x)R410A

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The thermophysical properties and critical parameters for the alternative refrigerant R410A (a near azeotropic refrigerant mixture containing difluoromethane (R32) and pentafluoroethane (R125) (50 wt % of each)) were investigated using two different acoustic techniques. The critical behavior of the system xCO(2) + (1 - x) R410A was also investigated. Experimental data of speed of sound in liquid R410A from (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 T-c and pressure pc on (R410A) and mixtures of xCO(2) + (1 - x) R410A 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 rules was used to correlate the binary experimental data.
Original languageEnglish
Pages (from-to)1906-1914
JournalJournal of Chemical and Engineering Data
Issue number5
Publication statusPublished - Sep 2006



  • Density (specific gravity)
  • Equations of state
  • Fluorine compounds
  • Mixtures
  • Specific heat
  • Thermodynamic properties
  • Refrigerants

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