Thermal conductivity of HFC-32, HFC-125, and HFC-134a in the solid phase

X. Gao, Y. Nagasaka, A. Nagashima

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Abstract

Measurements of the thermal conductivity of HFC-32, HFC-125, and HFC-134a were carried out for the first time in both solid and liquid phases at the saturation pressure at room temperature and in the temperature ranges from 120 to 263, from 140 to 213, and from 130 to 295 K, respectively. A transient hot-wire instrument using one bare platinum wire was employed for measurements, with an uncertainty of less than ±2%. The experimental results demonstrated that the thermal conductivity of HFC-32, HFC-125, and HFC-134a in the solid phase showed a positive temperature dependence. For HFC-32 and HFC-125, there were big jumps between the solid and the liquid thermal conductivity at the melting point. But for HFC-134a, the solid and liquid thermal conductivity at the melting point is almost-continuous.

Original languageEnglish
Pages (from-to)415-425
Number of pages11
JournalInternational Journal of Thermophysics
Volume19
Issue number2 SPEC.ISS.
DOIs
Publication statusPublished - 1998 Mar 1

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Keywords

  • HFC-125
  • HFC-32
  • HfC-134a
  • Melting point
  • Refrigerant
  • Thermal conductivity
  • Transient hot-wire method

ASJC Scopus subject areas

  • Condensed Matter Physics

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