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Special Issue "Exergy Analysis and Optimization of Energy Systems and Processes"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Thermal Management".

Deadline for manuscript submissions: 1 July 2019

Special Issue Editor

Guest Editor
Prof. Dr. Michel Feidt

Laboratoire d’Énergétique et de Mécanique Théorique et Appliquée, UMR 7563, Université de Lorraine, 54505 Vandoeuvre-lès-Nancy, France
Website | E-Mail
Interests: thermodynamics; energy; environment; economy; optimization

Special Issue Information

Dear Colleagues,

This Special Issue is concerned with exergy concept and uses. Exergy (availability) is an old concept that was proposed a long time ago by Gouy in 1889, and was developed after by Stodola, Rant, and more recently, by Szargut. Actually, this scientific field is mature from an engineering point of view, and we note every year that between 1000 and 1500 publications are relevant to the subject. Some scientific journals are particularly involved in exergy analysis (energies too).

The objective of this Special Issue is to reinforce the uses of the concept in new domains (life sciences, societal aspects, nano and mini scales, and megascale systems). Progresses in chemical and mechanical engineering remain of interest, but with a focus on integration and hybridization. The combination of exergy analysis and optimization with environmental or economic objectives (or constraints) are important too, particularly exergo–economic consideration.

From a fundamental point of view, the relation of exergy analysis to efficiency, environmental impact, and renewability remains to be developed. Emergy compared to exergy is also of interest. Lastly, the exergy of the systems far from equilibrium, and with non stationary references, constitute a coming field of research improving the exergy method.

You are welcomed to contribute to the fundamental and applied aspects of the exergy concept, which is now mature, and to migrate in various new scientific specialities.

Prof. Dr. Michel Feidt
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • exergy, energy conversion, and emergy
  • exergy costing
  • renewability
  • exergo-economy
  • efficiency
  • waste heat
  • living systems
  • fundamentals

Published Papers (1 paper)

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Research

Open AccessArticle
Numerical Calculation Method of Model Predictive Control for Integrated Vehicle Thermal Management Based on Underhood Coupling Thermal Transmission
Energies 2019, 12(2), 259; https://doi.org/10.3390/en12020259
Received: 10 December 2018 / Revised: 11 January 2019 / Accepted: 11 January 2019 / Published: 15 January 2019
PDF Full-text (7985 KB) | HTML Full-text | XML Full-text
Abstract
The nonlinear model predictive control (NMPC) controller is designed for an engine cooling system and aims to control the pump speed and fan speed according to the thermal load, vehicle speed, and ambient temperature in real time with respect to the coolant temperature [...] Read more.
The nonlinear model predictive control (NMPC) controller is designed for an engine cooling system and aims to control the pump speed and fan speed according to the thermal load, vehicle speed, and ambient temperature in real time with respect to the coolant temperature and comprehensive energy consumption of the system, which serve as the targets. The system control model is connected to the underhood computational fluid dynamics (CFD) model by the coupling thermal transmission equation. For the intricate thermal management process predictive control and system control performance analysis, a coupling multi-thermodynamic system nonlinear model for integrated vehicle thermal management was established. The concept of coupling factor was proposed to provide the boundary conditions considering the thermal transmission interaction of multiple heat exchangers for the radiator module. Using the coupling factor, the thermal flow influence of the structural characteristics in the engine compartment was described with the lumped parameter method, thereby simplifying the space geometric feature numerical calculation. In this way, the coupling between the multiple thermodynamic systems mathematical model and multidimensional nonlinear CFD model was realized, thereby achieving the simulation and analysis of the integrated thermal management multilevel cooperative control process based on the underhood structure design. The research results indicated an excellent capability of the method for integrated control analysis, which contributed to solving the design, analysis, and optimization problems for vehicle thermal management. Compared to the traditional engine cooling mode, the NMPC thermal management scheme clearly behaved the better temperature controlling effects and the lower system energy consumption. The controller could further improve efficiency with reasonable coordination of the convective thermal transfer intensity between the liquid and air sides. In addition, the thermal transfer structures in the engine compartment could also be optimized. Full article
(This article belongs to the Special Issue Exergy Analysis and Optimization of Energy Systems and Processes)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Exergy analysis and process optimization with variable environment temperature
Author: Michel Pons *
Affiliation: LIMSI, CNRS, Université Paris-Saclay, Rue du Belvédère, bât 507, 91405 Orsay Cedex, France
Correspondence: [email protected]; Tel.: +33-1691-58144

Abstract: Exergy is usually defined with respect to the environment temperature, which is used as a fixed reference. However, the environment temperature is essentially variable. The question then is: must exergy be defined with respect to a variable, or to a steady temperature? Thermodynamic consequences of either position are derived, leading to the concept of reversible processes in variable environment, forcedly equipped with an ideal heat storage. The exergy losses due to imperfect heat storage (finite size and finite heat exchange area) can then be identified and evaluated, including for the worst heat storage, the nonexistent one. The concepts are exemplified with the cases of air-conditioning in summertime, and of heat-pumping in winter. The analysis also demonstrates the existence of a minimum for the heat storage size, and shows how these exergy losses depend on the heat storage characteristics. The formal method for including these exergy losses into the optimization process is also described.

Title: Hybrid optimization methodology (Exergy/ Pinch) and application on a simple process
Author: Christelle Bou Malham, Assaad Zoughaib and Rodrigo Rivera Tinoco
Affiliation: Mines ParisTech, PSL Research University, France
Abstract: In the light of the alarming impending energy scene, energy efficiency is unmistakably gathering momentum. Among energy efficient process design methodologies, literature suggests pinch analysis and exergy analysis as two powerful thermodynamic methods, each showing certain drawbacks, however. In this perspective, this article puts forward a methodology that couples pinch and exergy analysis in a way to surpass their individual limitations in the aim of generating optimal operating conditions and topology for industrial processes. Using new optimizing exergy‐based criteria, exergy analysis is used not only to assess the exergy losses but also to guide the potential improvements in industrial processes structure and operating conditions. And while pinch analysis considers only heat integration to satisfy existent needs, the proposed methodology allows including other forms of recoverable exergy and explores new synergy pathways through conversion systems. A simple case study is proposed to demonstrate the applicability and efficiency of the proposed method.
Keywords: Pinch Analysis, Exergy Analysis, Operating Conditions Optimization, Structural Optimization, Heuristics, Industrial Processes

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