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Speed of Sound Measurements of Binary Mixtures of Hydrofluorocarbons [Pentafluoroethane (R-125), 1,1-Difluoroethane (R-152a), or 1,1,1,2,3,3,3-Heptafluoropropane (R-227ea)] with Hydrofluoroolefins [2,3,3,3-Tetrafluoropropene (R-1234yf) or trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E))]

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Abstract

Speed of sound data measured using a dual-path pulse-echo instrument are reported for three binary refrigerant mixtures, R-125/1234yf, R-1234yf/152a, and R-1234ze(E)/227ea, at compositions of (0.33/0.67) and (0.67/0.33) mole fraction. The speed of sound was studied at temperatures ranging from 230 K to 345 K from pressures slightly above the bubble point curve up to 20 MPa for the mixtures containing R-1234yf and 49 MPa for the R-1234ze(E)/227ea mixtures. The relative combined expanded speed of sound uncertainty ranged from 0.039 % to 0.317 % with a mean uncertainty over all state points of less than 0.10 %. The reported data are compared to the most recent mixture models in REFPROP for each blend studied. Comparisons of available mixture models for the R-125/1234yf and R-1234yf/152a blends exhibit average absolute deviation values ranging from 0.10 % to 0.27 %, and the average absolute deviations for R-1234ze(E)/227ea blends range from 0.62 % to 0.94 %. The comparisons show that only minor adjustments are required to the R-125/1234yf and R-1234yf/152a mixture models to represent the speed of sound data within its uncertainty. However, significant adjustments are needed to improve the current mixture models for the R-1234ze(E)/227ea blend. Deficiencies with the R-1234ze(E)/227ea mixture model are not unexpected since it (1) utilizes a pure-fluid EOS R-1234ze(E) that has been shown to inaccurately represent R-1234ze(E) speed of sound values and (2) uses binary interaction parameters for the chemically similar mixture of R-1234yf/227ea.

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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, Stephanie Outcalt for degassing the pure refrigerant samples, Mark McLinden for his guidance in preparing the gas mixtures for the speed of sound measurements and technical discussions pertinent to this work, 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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Rowane, A.J., Perkins, R.A. Speed of Sound Measurements of Binary Mixtures of Hydrofluorocarbons [Pentafluoroethane (R-125), 1,1-Difluoroethane (R-152a), or 1,1,1,2,3,3,3-Heptafluoropropane (R-227ea)] with Hydrofluoroolefins [2,3,3,3-Tetrafluoropropene (R-1234yf) or trans-1,3,3,3-Tetrafluoropropene (R-1234ze(E))]. Int J Thermophys 43, 127 (2022). https://doi.org/10.1007/s10765-022-03052-7

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  • DOI: https://doi.org/10.1007/s10765-022-03052-7

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