Abstract
Alternative refrigerants HFC-152a (CHF2CH3), HFC-143a (CF3CH3), HFC-134a (CF3CH2F), and HCFC-142b (CF2ClCH3) are modeled as a dipolar two-center Lennard–Jones fluid. Potential parameters of the model are fitted to the critical temperature and vapor–liquid equilibrium data. The required vapor–liquid equilibrium data of the model fluid are computed by the Gibbs–Duhem integration for molecular elongations L=0.505 and 0.67, and dipole moments μ*2=0, 2, 4, 5, 6, 7, and 8. Critical properties of the model fluid are estimated from the law of rectilinear diameter and critical scaling relation. The vapor–liquid equilibrium data are represented by Wagner equations. Comparison of the vapor–liquid equilibrium data based on the dipolar two-center Lennard–Jones fluid with data from the REFPROP database shows good-to-excellent agreement for coexisting densities and vapor pressure.
Similar content being viewed by others
REFERENCES
C. Kriebel, A. Muller, J. Winkelmann, and J. Fischer, Int. J. Thermophys. 17:1349 (1996), and Refs. 1–12 therein.
M. Lisal and V. Vacek, Mol. Phys. 87:167 (1996); Fluid Phase Equil. 127:83 (1997).
F. Kohler and N. Van Nhu, Mol. Phys. 80:795 (1993).
C. Vega, B. Saager, and J. Fischer, Mol. Phys. 68:1079 (1989).
M. E. van Leeuwen, Fluid Phase Equil. 99:1 (1994).
J. Gallagher, M. McLinden, G. Morrison, and M. Huber, NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP), NIST Std. Ref. Database 23, Version 5.0 (NIST, Boulder, CO, 1993).
M. P. Allen and D. J. Tildesley, Computer Simulation of Liquids (Clarendon Press, Oxford, 1987).
J. Fischer, R. Lustig, H. Breitenfelder-Manske, and W. Lemming, Mol. Phys. 52:485 (1984).
Ch. Kriebel, A. Müller, J. Winkelmann, and J. Fischer, Mol. Phys. 84:381 (1995).
D. A. Kofke, J. Chem. Phys. 98:4149 (1993).
M. Lísal and V. Vacek, Mol. Sim. 17:27 (1996); M. Lísal, R. Budinský, and V. Vacek, Fluid Phase Equil. 135:193 (1997).
W. Duschek, R. Kleinrahm, and W. Wagner, J. Chem. Thermodyn. 22:841 (1990).
B. Garzón, S. Lago, C. Vega, and L. F. Rull, J. Chem. Phys. 102:7204 (1995); C. Vega, S. Lago, and B. Garzón, J. Chem. Phys. 98:11181 (1994).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lísal, M., Budinský, R., Vacek, V. et al. Vapor–Liquid Equilibria of Alternative Refrigerants by Molecular Dynamics Simulations. International Journal of Thermophysics 20, 163–174 (1999). https://doi.org/10.1023/A:1021490500152
Issue Date:
DOI: https://doi.org/10.1023/A:1021490500152