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An Experimental Study of the pVTx Properties for Binary Mixtures of HFC-32 and HFC-125 from 258 to 354 K at Pressures up to 16.9 MPa

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Abstract

An experimental study of the pVTx properties for binary mixtures of HFC-32 (CH2F2) and HFC-125 (C2HF5) was conducted in the range of temperatures from 258 to 354 K, pressures up to 16.9 MPa, densities from 900 to 1400 kg·m−3, and compositions from 0 to 1 mole fraction of HFC-32, within the uncertainties of 4.8 mK of temperatures, 1.8 kPa of pressures, 0.022% of densities, and 0.0022 mole fraction of compositions. The present results were determined with the use of a constant-volume apparatus consisting of a cylindrical vessel of approximately 173 cm3 internal volume. The available data including the present measurements are critically compared with the equation of state developed by Tillner-Roth et al., and it is found that, in the liquid region for the range of compositions from 0.1 to 0.4 mole fraction of HFC-32, this equation of state is less reliable because of the lack of experimental data.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Faculty of Engineering, Kanagawa Institute of Technology, 1030 Shimo-Ogino, Atsugi-shi, Kanagawa, 243-0292, Japan

    T. Miyazaki & K. Oguchi

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  1. T. Miyazaki
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  2. K. Oguchi
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Correspondence to K. Oguchi.

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Paper presented at the Fifteenth Symposium on Thermophysical Properties, June 22–27, 2003, Boulder, Colorado, U.S.A.

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Miyazaki, T., Oguchi, K. An Experimental Study of the pVTx Properties for Binary Mixtures of HFC-32 and HFC-125 from 258 to 354 K at Pressures up to 16.9 MPa. Int J Thermophys 26, 1721–1732 (2005). https://doi.org/10.1007/s10765-005-8591-6

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  • DOI: https://doi.org/10.1007/s10765-005-8591-6

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