Measurements of vapor pressures and critical parameters for 1,1,1,3,3-pentafluoropropane (R 245fa)

Yukihiro Higashi, Ryo Akasaka

Research output: Contribution to conferencePaperpeer-review

1 Citation (Scopus)


The determination of the critical parameters as well as the measurements of vapor pressures was made for 1,1,1,3,3-pentafluoropropane (R 245fa: C3H3F5). The critical temperature and critical density of R 245fa were determined by the direct observation of meniscus disappearance in consideration of the intensity of critical opalescence and meniscus disappearing level. The measurements of vapor pressures were carried out by the isochoric method. As for both of apparatus, temperature was measured with 25 Ω standard platinum resistance thermometer and thermometer bridge with an aid of ITS-90. The digital quartz pressure transducer and pressure indicator were used for the pressure measurements. And density was calculated from the sample mass and inner volume of pressure vessel. The experimental uncertainties of temperature, pressure, and density measurements are estimated within 20 mK, 1 kPa, and 0.1%, respectively. Twenty-nine vapor pressure data for R 245fa were obtained in the temperature range from 310 K to the critical temperature and pressure up to 3.59 MPa with individual two runs. On the basis of these vapor-pressure measurements, the correlation of vapor pressures was proposed. The comparison with the vapor-pressure data reported by other investigators was also made. The authors are greatly indebted to Kobe Steel Ltd., Japan, for financial support, and to Asahi Glass Co., Japan, for furnishing and analyzing the high purity sample. The authors greatly thank to Messrs S. Hayasaka, C. Shirai, and Y. Oohira who are the student of Iwaki Meisei University, for their valuable assistance in the experiment. This work was supported by Grant-in-Aid for Scientific Research (C) 24560240 and 24560243 from Japan Societry for the Promotion of Science.

Original languageEnglish
Publication statusPublished - Jan 1 2014
Externally publishedYes
Event7th Asian Conference on Refrigeration and Air Conditioning, ACRA 2014 - Jeju Island, Korea, Republic of
Duration: May 18 2014May 21 2014


Other7th Asian Conference on Refrigeration and Air Conditioning, ACRA 2014
Country/TerritoryKorea, Republic of
CityJeju Island

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Control and Systems Engineering
  • Mechanical Engineering


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