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Experimental measurement and model of transcritical pvTx property for binary mixture of carbon dioxide and 2,3,3,3-Tetrafluoropropylene (CO2+R1234yf). 

Author(s) : WANG E., WANG R., QING K., XU L., YANG Z., DUAN Y.

Type of article: IJR article

Summary

The mixture of carbon dioxide (CO2) and environmentally friendly refrigerant 2,3,3,3-tetrafluoropropylene (R1234yf) has excellent environmental performance, low critical temperature, and excellent thermal perfor mance. It is expected to be used as a substitute for refrigerants with high global warming potential in automotive air conditioning and medium-low-temperature thermal systems. The pvTx property is one of the most funda mental thermophysical properties of mixtures, and transcritical experimental data is crucial for the application of supercritical mixtures. This work conducted the experimental measurements of transcritical pvTx property for CO2+R1234yf mixture by using an improved variable-volume-constant Burnett apparatus, and obtained experimental data for two CO2 mole fractions of x1=0.4558 and 0.8324. The corresponding density ranges were from low-density gas to the highest densities of 898 kg/m3 and 712 kg/m3, respectively. The temperature range was from 311.15 K to 423.15 K, and the highest pressure was up to 10 MPa. The expanded measurement un certainties (k =2) for temperature, pressure, density, and mole fraction were no >14 mK, 0.03%, 0.20%, and 0.0036, respectively. A total of 166 single-phase pvTx data and 71 vapor-liquid coexistence data were obtained. Reliable near-critical bubble points and dew points data of CO2+R1234yf were obtained based on the pvTx property. The crossover volume-translation Peng-Robinson equation of state was established to correlate and describe the transcritical pvTx properties, and its calculation performance was compared with that of other equations of state.

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  • Original title: Experimental measurement and model of transcritical pvTx property for binary mixture of carbon dioxide and 2,3,3,3-Tetrafluoropropylene (CO2+R1234yf). 
  • Record ID : 30034931
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 187
  • Publication date: 2026/07
  • DOI: http://dx.doi.org/https://doi.org/10.1016/j.ijrefrig.2026.106938

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