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Equations for the Thermal Conductivity of R-32, R-125, R-134a, and R-143a

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Abstract

At present hydrofluorocarbons (HFCs) such as R32, R-125, R-134a, and R-143a are widely used, and it is required to obtain accurate information of thermophysical properties, especially of the thermal conductivity of HFCs. In this paper new thermal conductivity equations for R-32, R-125, R134a, and R143a are proposed, applicable over a wide range of temperature and pressure including the critical region based on existing experimental data, and the reliability of the present equations is summarized. The problem that the thermal conductivity calculated from the thermal diffusivity in the critical region differs depending on the equation of state is also discussed.

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Authors and Affiliations

  1. Department of Mechanical Systems Engineering, Faculty of Engineering, Fukuyama University, Sanzo, 1 Gakuen-cho, Fukuyama, 729-0292, Japan

    J. Yata

  2. Daihatsu Motor Co. Ltd., Daihatsu-cho, Ikeda, Osaka, 560-0044, Japan

    Y. Ueda

  3. Department of Mechanical and System Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto, 606-8585, Japan

    M. Hori

Authors
  1. J. Yata
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  2. Y. Ueda
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  3. M. Hori
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Correspondence to J. Yata.

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Paper presented at the Sixteenth European Conference for Thermophysical Properties, September 1–4, 2002, London, United Kingdom.

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Yata, J., Ueda, Y. & Hori, M. Equations for the Thermal Conductivity of R-32, R-125, R-134a, and R-143a. Int J Thermophys 26, 1423–1435 (2005). https://doi.org/10.1007/s10765-005-8095-4

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  • DOI: https://doi.org/10.1007/s10765-005-8095-4

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