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- Title
Prediction of critical points for carbon dioxide-based binary mixtures by the Heidemann-Khalil approach.
- Authors
RUI SUN; HUA TIAN; GEQUN SHU
- Abstract
Prediction of critical point is of great interest for CO:based binary mixlure being the working fluid of power cycle. Compared with empirical correlation. the critical point of mixture can be calculated based on its rigorous thermodynamic criteria. with limited binary interaction parameters and consistency on vapor-liquid equilibrium and other thermodynatnic properties. In this study. the critical points of CO:based binary mixture. applicable for being working fluid of power cycle. including hydrocarbons. fluorocarbons. diniethyl ether, methanol, water and xenon, were studied ba;ed on the Peng-Robinson equation of state (PR EOS) with van der Waals (vdW) mixing rule, according to the Heidemann-Khalil approach. By comparing the predicted results with the experimentai data in the literature, the applicability of this method to various mixtures is discussed. The characteristics of critical lines, type of phase diagram, and binary interaction parameters of each mixture were analyzed and discusxed, and the results show that the Heidemann-Khalil approach is efficient fur critical point calculation and prediction of COi-based hillary mixture.
- Subjects
BINARY mixtures; CRITICAL point (Thermodynamics); PENG-Robinson equation; EQUATIONS of state; VAPOR-liquid equilibrium; WORKING fluids; HEAT pipes
- Publication
High Temperatures - High Pressures, 2023, Vol 52, Issue 5, p411
- ISSN
0018-1544
- Publication type
Article
- DOI
10.32908/hthp.v52.1441