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Speed of Sound Measurements of Binary Mixtures of Difluoromethane (R-32) with 2,3,3,3-Tetrafluoropropene (R-1234yf) or trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E)) Refrigerants

  • TALGAT KHASANSHIN: IN MEMORIAM
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Abstract

Sound speed data measured using a dual-path pulse-echo instrument are reported for binary mixtures of difluoromethane (R-32) with 2,3,3,3-tetrafluoropropene (R-1234yf) or trans-1,3,3,3-tetrafluoropropene (R-1234ze(E)). The sound speed is reported at two compositions for each binary mixture of approximately (0.33/67) and (0.67/0.33) mole fraction at temperatures between 230 K and 345 K. Data are reported from pressures slightly above the bubble point to 12 MPa for R-32/1234yf mixtures to avoid potential polymerization reactions and to 53 MPa for the R-32/1234ze(E) mixtures. The mean uncertainty of the sound speed data are less than 0.1% of the measured value where uncertainties at individual state points range from 0.04% to 0.5% of the measured value as the conditions approach the mixture critical region. The reported data are compared to available Helmholtz-energy-explicit EOS included in REFPROP and all systems studied have average absolute deviations greater than 2%. The comparisons show that further adjustments to the mixture models are needed to provide a reasonable representation of the data within its experimental uncertainty.

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Acknowledgements

We thank Megan Harries and Jason Widegren for providing analysis of the pure fluids used to prepare the binary mixtures studied in this work, Mark McLinden for his guidance in preparing the gas mixtures for the speed of sound measurements and technical discussions pertinent to this work, Stephanie Outcalt for preparing the pure-fluid samples used to prepare each mixture, Ian Bell for his helpful technical discussions pertaining to the Helmholtz-energy-explicit EoS, and Eric Lemmon and Ryo Akasaka for providing the fluid file for the R-1234yf EoS. We gratefully acknowledge the support of the U.S. Department of Energy, Building Technologies Office under Agreement 892434-19-S-EE000031.

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  1. Applied Chemicals and Materials Division, National Institute of Standards and Technology, Boulder, CO, 80305, USA

    Aaron J. Rowane & Richard A. Perkins

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  1. Aaron J. Rowane
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Correspondence to Aaron J. Rowane.

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This article is part of the Special Issue in Memory of Professor Talgat Khasanshin.

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Rowane, A.J., Perkins, R.A. Speed of Sound Measurements of Binary Mixtures of Difluoromethane (R-32) with 2,3,3,3-Tetrafluoropropene (R-1234yf) or trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E)) Refrigerants. Int J Thermophys 43, 46 (2022). https://doi.org/10.1007/s10765-021-02966-y

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