International Journal of Thermophysics

, Volume 24, Issue 4, pp 991–1006 | Cite as

Pseudo-Pure Fluid Equations of State for the Refrigerant Blends R-410A, R-404A, R-507A, and R-407C

  • E. W. Lemmon
Article

Abstract

Pseudo-pure fluid equations of state explicit in Helmholtz energy have been developed to permit rapid calculation of the thermodynamic properties of the refrigerant blends R-410A, R-404A, R-507A, and R-407C. The equations were fitted to values calculated from a mixture model developed in previous work for mixtures of R-32, R-125, R-134a, and R-143a. The equations may be used to calculate the single-phase thermodynamic properties of the blends; dew and bubble point properties are calculated with the aid of additional ancillary equations for the saturation pressures. Differences between calculations from the pseudo-pure fluid equations and the full mixture model are on average 0.01%, with all calculations less than 0.1% in density except in the critical region. For the heat capacity and speed of sound, differences are on average 0.1% with maximum differences of 0.5%. Generally, these differences are consistent with the accuracy of available experimental data for the mixtures, and comparisons are given to selected experimental values to verify accuracy estimates. The equations are valid from 200 to 450 K and can be extrapolated to higher temperatures. Computations from the new equations are up to 100 times faster for phase equilibria at a given temperature and 5 times faster for single-phase state points given input conditions of temperature and pressure.

density equation of state heat capacity HFC-32 HFC-125 HFC-134a HFC-143a R-404A R-407C R-410A R-507A refrigerant mixtures speed of sound thermodynamic properties VLE 

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Reference

  1. 1.
    E. W. Lemmon and R. T Jacobsen, submitted to J. Phys. Chem. Ref. Data.Google Scholar
  2. 2.
    E. W. Lemmon,R. T Jacobsen,S. G. Penoncello,andD. G. Friend,J. Phys. Chem. Ref. Data 29:331(2000).Google Scholar
  3. 3.
    E. W. Lemmon and A. R. H. Goodwin, J. Phys. Chem. Ref. Data 29:1(2000).Google Scholar
  4. 4.
    S. Benmansour and D. Richon, Int. Electron. J. Phys.-Chem. Data 3:149(1997).Google Scholar
  5. 5.
    S. Benmansour and D. Richon, Int. Electron. J. Phys.-Chem. Data 5:9(1999).Google Scholar
  6. 6.
    J. W. Magee, private communication,National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado (2002).Google Scholar
  7. 7.
    R. A. Perkins, private communication, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado (2002).Google Scholar
  8. 8.
    C.-C. Piao, I. Iwata, and M. Noguchi, private communication, Mech. Eng. Lab., Daukin Industries, Ltd., Japan (1996).Google Scholar
  9. 9.
    T. Sato, H. Kiyoura, H. Sato, and K. Watanabe, Int. J. Thermophys. 17:43(1996).Google Scholar
  10. 10.
    H.-L. Zhang, H. Sato, and K. Watanabe, J. Chem. Eng. Data 41:1401(1996).Google Scholar
  11. 11.
    C. Bouchot and D. Richon, Int. Electron. J. Phys.-Chem. Data 4:163(1998).Google Scholar
  12. 12.
    K. Fujiwara, S. Nakamura, and M. Noguchi, J. Chem. Eng. Data 43:967(1998).Google Scholar
  13. 13.
    H. Kiyoura, J. Takebe, H. Uchida, H. Sato, and K. Watanabe, J. Chem. Eng. Data 41:1409(1996).Google Scholar
  14. 14.
    J. W. Magee, Int. J. Thermophys. 21:151(2000).Google Scholar
  15. 15.
    J. V. Widiatmo, T. Fujimine, H. Sato, and K. Watanabe, J. Chem. Eng. Data 42:270(1997).Google Scholar
  16. 16.
    E. W. Lemmon, M. O. McLinden, and M. L. Huber, NIST Standard Reference Database 23: Reference Fluid Thermodynamic and Transport Properties-REFPROP, Version 7.0, National Institute of Standards and Technology, Standard Reference Data Program, Gauthersburg, Maryland (2002).Google Scholar

Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • E. W. Lemmon
    • 1
  1. 1.Physical and Chemical Properties DivisionNational Institute of Standards and TechnologyBoulder

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