Analysis of Thermodynamic Models for Simulation and Optimisation of Organic Rankine Cycles

Durakovic, Goran; Skaugen, Geir

doi:10.3390/en12173307

Cited by 3 publications

(3 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[116], it was shown that the van-der-Waals equation for non-ideal gases corresponds in LGM to the approach of an average field. All other constructions for phenomenological equations of a state are derived in the same style [103,104,117,118]; this leads to the obvious contradiction when modeling SCF processes: various phenomenological equations of a state reflect the non-ideality of a reactionary system, whereas the equations for kinetic models do not reflect the non-ideality of systems.…”

Section: The Equations Of a State For Non-ideal Systems And Their Con...mentioning

confidence: 99%

See 1 more Smart Citation

Molecular Modeling of Supercritical Processes and the Lattice—Gas Model

Tovbin

2023

Processes

View full text Add to dashboard Cite

The existing possibilities for modeling the kinetics of supercritical processes at the molecular level are considered from the point of view that the Second Law of thermodynamics must be fulfilled. The only approach that ensures the fulfillment of the Second Law of thermodynamics is the molecular theory based on the discrete–continuous lattice gas model. Expressions for the rates of the elementary stage on its basis give a self-consistent description of the equilibrium states of the mixtures under consideration. The common usage today of ideal kinetic models in SC processes in modeling industrial chemistry contradicts the non-ideal equation of states. The used molecular theory is the theory of absolute reaction rates for non-ideal reaction systems, which takes into account intermolecular interactions that change the effective activation energies of elementary stages. This allows the theory to describe the rates of elementary stages of chemical transformations and molecular transport at arbitrary temperatures and reagent densities in different phases. The application of this theory in a wide range of state parameters (pressure and temperature) is considered when calculating the rates of elementary bimolecular reactions and dissipative coefficients under supercritical conditions. Generalized dependencies are calculated within the framework of the law of the corresponding states for the coefficients of compressibility, shear viscosity, and thermal conductivity of pure substances, and for the coefficients of compressibility, self- and mutual diffusion, and shear viscosity of binary mixtures. The effect of density and temperature on the rates of elementary stages under supercritical conditions has been demonstrated for a reaction’s effective energies of activation, diffusion and share viscosity coefficients, and equilibrium constants of adsorption. Differences between models with effective parameters and the prospects for developing them by allowing for differences in size and contributions from the vibrational motions of components are described.

show abstract

Section: The Equations Of a State For Non-ideal Systems And Their Con...mentioning

confidence: 99%

“…On the other hand, different equations of states can be used in one work. In [103] 14 equations of states were used; similarly, 13 equations of states were considered in [104].…”

Section: Introductionmentioning

confidence: 99%

Molecular Modeling of Supercritical Processes and the Lattice—Gas Model

Tovbin

2023

Processes

View full text Add to dashboard Cite

show abstract

“…Recent papers [1][2][3][4] prove that this topic is a well-studied one by the analysis of thermodynamic models for the simulation and optimization of power systems [1,2], as well as energy and exergy analysis of waste heat recovery systems [3,4]. For instance, an assessment with the citation indexing service Web of Science, that provides a comprehensive citation search through multiple databases, gives for "waste heat" a total of 23,717 references within its core collection over the period 1950-2017, of which 313 are highly cited.…”

Section: Introductionmentioning

confidence: 99%

New Criteria to Characterize the Waste Heat Recovery

Feidt

Costea

Feidt³

et al. 2020

Energies

View full text Add to dashboard Cite

Waste heat recovery is an actual goal. The best way to valorize waste heat is to use it directly with the appropriate level of temperature. If the temperature level is insufficient, many reverse machine configurations are available in order to obtain the appropriate conditions (the most known are heat pumps and heat transformers). Finally, the remaining unused heat could be converted to any noble form of energy (mechanical, electrical essentially). We propose here to examine, with a new point of view, the thermomechanical conversion limit of waste heat. This limit corresponds to adiabatic conversion for an endo-reversible Carnot engine, with a perfect thermal contact at the atmospheric sink (supposed infinite). The Carnot–Chambadal model version is applied to latent and sensible heat recovery cases. The results associated with these two cases differ fundamentally. Comments are provided on the two studied cases, and new criteria to characterize the corresponding waste heat recovery are proposed.

show abstract

Comparative Study of Phase Equilibrium Modeling with Cubic and Association Equations of State

Li,

Ye,

Liang

2024

J. Chem. Eng. Data

View full text Add to dashboard Cite

Cubic and association equations of state are two of the most widely used types of thermodynamics models. In this work, we focused on comparing the predictive capabilities of three equations of state, namely, the original Peng−Robinson, the perturbed-chain SAFT, and SAFT-VR Mie, for modeling phase equilibria of diverse types of systems. Vapor−liquid equilibria predictions from these three equations of state were evaluated using a recently published benchmark database of 200 binary systems. In addition, we compared their capabilities in predicting the liquid−liquid equilibria of ternary mixtures and vapor− liquid equilibria of a quaternary mixture. The general conclusion is that the SAFT-VR Mie equation of state presents the best performance from an overall viewpoint, but the Peng−Robinson and perturbed-chain SAFT equations of state show respectively superior performance for some specific types of systems.

show abstract

Analysis of Thermodynamic Models for Simulation and Optimisation of Organic Rankine Cycles

Cited by 3 publications

References 28 publications

Molecular Modeling of Supercritical Processes and the Lattice—Gas Model

Molecular Modeling of Supercritical Processes and the Lattice—Gas Model

New Criteria to Characterize the Waste Heat Recovery

Comparative Study of Phase Equilibrium Modeling with Cubic and Association Equations of State

Contact Info

Product

Resources

About