An improved crossover SRK EOS for more accurate assessment of thermodynamic properties of CO2+pentane binary system

IF 2.8 3区工程技术 Q3 CHEMISTRY, PHYSICAL Fluid Phase Equilibria Pub Date : 2025-03-01 DOI:10.1016/j.fluid.2025.114409

Kexin Ren, Ao Dong, Yuhang Chen, Yiran Wang, Taotao Zhan, Maogang He, Ying Zhang

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引用次数: 0

Abstract

The CO₂ transcritical power cycles in medium-high temperature areas are gaining attention for industrial heat recovery. At present, increasing studies focus on CO₂-based mixtures, particularly the CO₂+pentane binary mixture, due to its high thermal efficiency and low operating pressure. Based on this, high-precision calculation of thermodynamic properties is essential. In this study, the crossover SRK (CSRK) equation of state (EoS) based on Kiselev's crossover method is established, then the phase equilibrium properties, second-order thermodynamic properties, and single-phase region density for pentane and CO₂+pentane binary system are investigated using CSRK. Our research reveals that CSRK can accurately describe the thermodynamic properties of working fluids in near-critical region, precisely explore the change law of critical region density, and improve calculation accuracy of thermodynamic properties in far-critical region, which is suitable for engineering application. The CSRK significantly improves the calculation accuracy on liquid density, reducing the average absolute relative deviation (AARD) by more than half to 1.89 % compared with multi-parameter EoS. Additionally, a new phase equilibrium iterative solution method of binary mixtures is proposed, which has higher calculation efficiency and faster evaluation of the response of system to different disturbances, providing important support for future dynamic analysis.

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来源期刊

Fluid Phase Equilibria 工程技术-工程：化工

CiteScore

5.30

自引率

15.40%

发文量

223

审稿时长

53 days

期刊介绍： Fluid Phase Equilibria publishes high-quality papers dealing with experimental, theoretical, and applied research related to equilibrium and transport properties of fluids, solids, and interfaces. Subjects of interest include physical/phase and chemical equilibria; equilibrium and nonequilibrium thermophysical properties; fundamental thermodynamic relations; and stability. The systems central to the journal include pure substances and mixtures of organic and inorganic materials, including polymers, biochemicals, and surfactants with sufficient characterization of composition and purity for the results to be reproduced. Alloys are of interest only when thermodynamic studies are included, purely material studies will not be considered. In all cases, authors are expected to provide physical or chemical interpretations of the results. Experimental research can include measurements under all conditions of temperature, pressure, and composition, including critical and supercritical. Measurements are to be associated with systems and conditions of fundamental or applied interest, and may not be only a collection of routine data, such as physical property or solubility measurements at limited pressures and temperatures close to ambient, or surfactant studies focussed strictly on micellisation or micelle structure. Papers reporting common data must be accompanied by new physical insights and/or contemporary or new theory or techniques.