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

Published

January 29, 2022

Author(s)

Aaron Rowane, Richard A. Perkins

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.

Citation

International Journal of Thermophysics

Volume

43

Pub Type

Journals

Download Paper

https://doi.org/10.1007/s10765-021-02966-y

Local Download

Keywords

Speed of Sound, REFPROP, Refrigerant Mixtures, R32, R1234yf, R1234ze(E), Hydrofluorocarbons, Hydrofluoroolefins

Citation

Rowane, A. and Perkins, R. (2022), 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, International Journal of Thermophysics, [online], https://doi.org/10.1007/s10765-021-02966-y, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=933315 (Accessed October 14, 2025)