Estimation of the Critical Pressure Based on the Molecular Structure
Main Article Content
Abstract
A study on the estimation of critical pressure of working fluids in thermodynamic cycles based on molecular structure was carried out. The calculation flow chart for the determination of the critical pressure based on Joback method was presented in this study. This paper also presented the calculation flow chart for the determination of the critical pressure based on our proposed modified Joback method. The calculated critical pressures of HFO-1234yf, HFO-1234ze(E), and HFO-1243zf showed that the proposed modified Joback method is more accurate than the conventional Joback method. Due to the lack of experimental data and the accuracy of the modified Joback method, the critical pressures of 9 Hydrofluoroolefins (HFOs) as R1225yc, R1225zc, R1234yc, R1234ye (E), R1234ze(Z), R1243ye, R1243yf, R1243zc, and R1243ze(E) have been determined by the modified Joback method.
Keywords
Critical pressure, molecular structure, Joback method, modified Joback method
Article Details
References
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[10] C. Di Nicola, G. Di Nicola, M. Pacetti, F. Polonara, G. Santori, PV-T Behavior of 2, 3, 3, 3-Tetrafluoroprop-1-ene (HFO-1234yf) in the Vapor Phase from (243 to 373) K, J. Chem. Eng. Data 55 (2010) 3302-3306.
[11] Μ.Ο. McLinden, M. Thol, E.W. Lemmon, Thermodynamic properties of trans-1.3.3.3-tetrafluoropropene
[2] J. Benkoe, New correlations between the physical constants of organic compounds, Acta Chim. Hung.. 21, (1959) 351-361.
[3] A. L. Lydersen, Estimation of Critical Properties of Organic Compounds. Univ. Wisconsin Coll. Eng., Eng. Exp. Stn. rept. 3, Madison, WI, April, 1955.
[4] T.L. Nielsen, Molecular Structure Based Property Prediction, 15-point Project Department of Chemical Engineering, Technical University of Denmark., Lyngby, DK-2800, 1998.
[5] Y. Nannoolal, Development and Critical Evaluation of Group Contribution Methods for the Estimation of Critical Properties, Liquid Vapor Pressure and Liquid Viscosity of Organic Compounds. Thesis, University of Kwazulu-Natal, (2006).
[6] K. G. Joback, A Unified Approach to Physical Property Estimation Using Multivariate Statistical Techniques, S.M. Thesis, Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 1984.
[7] K. G. Joback, R. C. Reid, Estimation of Pure Component Properties from Group Contributions, Chemical Engineering Communications, 57 (1987) 233-243.
[8] N.A. Lai, Phương pháp Joback cải tiến, báo cáo nội bộ, Bách khoa Hà Nội, 2010.
[9] G. Di Nicola, J.S. Brown, L. Fedele, M. Securo, S. Bobbo, C. Zilio, Subcooled liquid density measurements and PvT measurements in the vapor phase for 3,3,3-trifluoroprop-1-ene (R1243zf), Int. J. Refrig. 36 (2013) 2209-2215.
[10] C. Di Nicola, G. Di Nicola, M. Pacetti, F. Polonara, G. Santori, PV-T Behavior of 2, 3, 3, 3-Tetrafluoroprop-1-ene (HFO-1234yf) in the Vapor Phase from (243 to 373) K, J. Chem. Eng. Data 55 (2010) 3302-3306.
[11] Μ.Ο. McLinden, M. Thol, E.W. Lemmon, Thermodynamic properties of trans-1.3.3.3-tetrafluoropropene