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International Journal of Thermophysics

, Volume 13, Issue 5, pp 837–854 | Cite as

The vapor pressure of 1,1,1,2-tetrafluoroethane (R134a) and chlorodifluoromethane (R22)

  • A. R. H. Goodwin
  • D. R. Defibaugh
  • L. A. Weber
Article

Abstract

We measured the vapor pressure of chlorodifluoromethane (commonly known as R22) at temperatures between 217.1 and 248.5 K and of 1,1,1,2-tetrafluoroethane (commonly known as R134a) in the temperature range 214.4 to 264.7 K using a comparative ebulliometer. For 1,1,1,2-tetrafluoroethane at pressures between 220.8 and 1017.7kPa (corresponding to temperatures in the range 265.6 to 313.2K), additional measurements were made with a Burnett apparatus. We have combined our results for 1,1,1,2-tetrafluoroethane with those already published from this laboratory at higher pressures to obtain a smoothing equation for the vapor pressure from 215 K to the critical temperature. For chlorodifluoromethane our results have been combined with certain published results to provide an equation for the vapor pressure at temperatures from 217 K to the critical temperature.

Key words

Burnett apparatus chlorodifluoromethane (R22) ebulliometry refrigerants 1,1,1,2-tetrafluoroethane (R134a) vapor pressure 

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Copyright information

© Plenum Publishing Corporation 1992

Authors and Affiliations

  • A. R. H. Goodwin
    • 1
  • D. R. Defibaugh
    • 1
  • L. A. Weber
    • 1
  1. 1.Thermophysics DivisionNational Institute of Standards and TechnologyMarylandUSA

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