Sound-velocity measurements for HFC-134a and HFC-152a with a spherical resonator

T. Hozumi, T. Koga, H. Sato, K. Watanabe

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

A spherical acoustic resonator was developed for measuring sound velocities in the gaseous phase and ideal-gas specific heats for new refrigerants. The radius of the spherical resonator, being about 5 cm, was determined by measuring sound velocities in gaseous argon at temperatures from 273 to 348 K and pressures up to 240 kPa. The measurements of 23 sound velocities in gaseous HFC-134a (1,1,1,2-tetrafluoroethane) at temperatures of 273 and 298 K and pressures from 10 to 250 kPa agree well with the measurements of Goodwin and Moldover. In addition, 92 sound velocities in gaseous HFC-152a (1,1-difluoroethane) with an accuracy of ±0.01% were measured at temperatures from 273 to 348 K and pressures up to 250 kPa. The ideal-gas specific heats as well as the second acoustic virial coefficients have been obtained for both these important alternative refrigerants. The second virial coefficients for HFC-152a derived from the present sound velocity measurements agree extremely well with the reported second virial coefficient values obtained with a Burnett apparatus.

Original languageEnglish
Pages (from-to)739-762
Number of pages24
JournalInternational Journal of Thermophysics
Volume14
Issue number4
DOIs
Publication statusPublished - 1993 Jul 1

Keywords

  • HFC-134a
  • HFC-152a
  • ideal-gas specific heat
  • second acoustic virial coefficient
  • second virial coefficient
  • sound velocity
  • spherical resonator

ASJC Scopus subject areas

  • Condensed Matter Physics

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