Prediction of PVT Properties of Pure Refrigerants Using ISM Equation of State
محورهای موضوعی : Physical Chemistry & Electrochemistry
Zahra Sharafi
1
(Department of Chemistry, Islamic Azad University, Marvdasht Branch, Marvdasht, Iran
Abstract
A)
کلید واژه: Equation of state, Heat of Vaporization, correlation, Saturation Liquid Density of Refrigerants,
چکیده مقاله :
A three-parameter cubic equation of state has been proposed for predicting PVT of pure refrigerants
such as R236ea, R236fa, R245fa, R245ca, R218, R227ea, and R717, from freezing point up to critical point
temperature and pressures up 650 atm. We explore the theory of the equation of state from the view point
of Ihm–Song–Mason (ISM) equation of state, which has been derived on the basis of statistical mechanical
perturbation theory, and is characterized by three temperature dependent parameters, a, b, B2 , and a free
parameter λ. The second virial coefficients are calculated from a correlation based on the heat of vaporization,
ΔHvap, and the liquid density at the normal boiling point, ρnb. α(T ) and b(T ) can also be calculated from
second virial coefficients by a scaling rule. The theory has considerable predictive power, since it permits
the construction of the PVT surface from the heat of vaporization and the liquid density at the normal boiling
point. The results indicate that the liquid densities can be predicted with very good agreement over a wide
range of temperatures, 100–400 K.
References
[1] G. Ihm, Y. Song, and E.A. Mason, Equation of state
for mixtures of non-polar molecular fluids, Mol.
Phys. 75 (1992) 897-915.
[2] H. Eslami, M.M. Papari, and A. Boushehri, On the
Equation of State for Quantum Systems, J. Phys.
Soc. Jpn. 69 (2000) 1731-1734.
[3] M. H. Ghatee, and A. Boushehri, An analytical
equation of state for molten alkali metals, Int. J.
Thermophys.16 (1995) 1429-1438.
[4] M. H. Ghatee, and A. Boushehri, Equation of state
for compressed liquids from surface tension, Int.
J. Thermophys. 17 (1996) 945-957.
[5] M.H. Mousazadeh and A. Boushehri, A correlation of
densities of liquid natural gas mixtures from surface
tension, Fluid Phase Equil. 168 (2000)125-134.
[6] A. Boushehri, F. S. Hashemi and T. Keshavarzi,
Prediction of hydrocarbon and CFC liquid mixtures
densities, Fluid Phase Equil. 129 (1997) 61-67.
[7] H. Eslami, F. Sabzi, and A. Boushehri, The ISM
Equation of State Applied to Refrigerants Int. J.
Thermophys. 20 (1999) 1547-1555.
[8] H. Eslami and A. Boushehri, Equation of state for
compressed liquid alkali metals, Fluid Phase Equil.
152 (1998) 235-242.
[9] S. Sheikh, M.M. Papari, and A. Boushehri, Equation
of State and Pressure-Volume-Temperature
Properties of Refrigerants Based on Speed of
Sound Data, Ind. Eng. Chem. Res. 41, 3274 (2002).
[10] H. Eslami, Equation of State for Nonpolar Fluids:
Prediction from Boiling Point Constants, Int. J.
Thermophys. 21 (2000) 1123-1137.
[11] A. Boushehri and E.A. Mason, Equation of state
for compressed liquids and their mixtures from the
cohesive energy density, Int. J. Thermophys. 14
(1993) 685-697.
[12] Z. Sharafi and A. Boushehri, Saturated Liquid
Densities for 33 Binary Refrigerant Mixtures Based
on the ISM Equation of State, Int. J. Thermophys.
26, (2005) 785-794.
[13] D. A. McQuarrie, Statistical Mechanics (Harper
Collins, New York, 1976).
[14] J. D. Weeks, D. Chandler, and H. C. Andersen,
Role of Repulsive Forces in Determining the
Equilibrium Structure of Simple Liquids, J. Chem.
Phys. 54 (1971) 5237-5247.
[15] Y. Song and E. A. Mason, Statistical mechanical
theory of a new analytical equation of state J.
Chem. Phys. 91 (1989) 7840-7853.
[16] Y. Song and E. A. Mason, Equation of state for
luids of spherical particles in d dimensions, J.
Chem. Phys. 93 (1990) 686-688.
[17] R. A. Aziz, A highly accurate interatomic potential
for argon, J. Chem. Phys. 99 (1993) 4518-4525.
[18] G. Ihm, Y. Song, and E.A. Mason, A new strong
principle of corresponding states for nonpolar
fluids, J. Chem. Phys. 94, (1991) 3839-3848.
[19] E.W. Lemmon, M.O. McLinden, and M.L. Huber,
NIST Standard Reference Database 23 (REFPROP
Version 7.0), National Institute of Standards and
Technology Boulder, Colorado 80305, 2002.
[20]http://www.tu_dresden.de/mw/iem/kkt/
mitarbeiter/lib/kraus/kaeltemittel.html
[21] H. L. Zhang, H. Sato, and K. Watanabe, Vapor Pressure
Measurements of 1,1,1,2,3,3-Hexafluoropropane
from 300 to 410 K, J. Chem. Eng. Data. 40, (1996)
1281-1284.
[22] G. D. Nicola, and G. Passerini, Saturated
Pressure and Gas Phase P−V−T Data for
1,1,2,2,3-Pentafluoropropane (R-245ca), J. Chem.
Eng. Data. 47 (2002) 882-886.
[23] B. Zhong, J.M. Bowman, and D.Williams, Paper
presented at the International Conference and
Exposition Polyurethanes Expo 2001, Columbus,
Ohio, September 30 - October 3, (2001).
[24] Sr. G.J. Zyhowski, M.W. Spatz, and S. Yana
Motta, Paper presented at the Ninth International
Refrigeration and Air Conditioning Conference at
Purdue. West Lafayette, Indiana, July, (2002) 16-19.
[25] L.J. Brasz, and W.M. Bilbow, paper R068
