Michel Feidt
Université de Lorraine, Lorraine, Faculty Member
- Michel Louis Feidt is a Professor of Thermal Engineering, a researcher at the University of Nancy France and he is th... moreMichel Louis Feidt is a Professor of Thermal Engineering, a researcher at the University of Nancy France and he is the author of many books .the first one is “Thermodynamique et Optimisation Energétique des Systèmes et Procédés”, (1987). He has many published scientific papers (more than 120 papers ) and communications in international congresses (more than 250 communications ). He is member of various scientific committees of Conferences and he is the Editor of several scientific journals.the main parts of his scientific works are devoted to thermodynamics and optimization of energy systems and processesedit
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Research Interests: Engineering, Computer Science, Heat Exchanger, Energy efficiency, Medicine, and 15 moreEntropy, Optimization, Comparison, Mathematical Sciences, Physical sciences, Plate Heat Exchanger, Heat pump, Refrigerator, Energy Efficiency, Finite Time Thermodynamics, Exergy Efficiency, entropy production, Carnot cycle, Energy losses, and Maximum Power Output
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Offering high efficiency through the recovery of thermal waste, cogeneration and trigeneration are valuable alternative technologies for producing energy. However, they should be further developed across the world in order to control the... more
Offering high efficiency through the recovery of thermal waste, cogeneration and trigeneration are valuable alternative technologies for producing energy. However, they should be further developed across the world in order to control the exploitation of fossil fuels and reduce greenhouse gas emissions. This Informatory Note discusses the operating principles of these technologies, their benefits as well as the obstacles hampering their development. In conclusion, the IIR provides some recommendations on the conditions required for the implementation of these technologies.
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Une premiere partie du texte est consacree a la presentation des echangeurs a film tombant sur plaques verticales, de leur avantage en terme de compacite par rapport a des architectures a tubes. Une deuxieme partie du texte traite de la... more
Une premiere partie du texte est consacree a la presentation des echangeurs a film tombant sur plaques verticales, de leur avantage en terme de compacite par rapport a des architectures a tubes. Une deuxieme partie du texte traite de la modelisation et des essais d'echangeurs implantes sur un prototype experimental de pompe a chaleur a compression-absorption. Ce prototype, que l'on presente, est concu pour produire de la chaleur a haute temperature (jusqu'a 120 °C ou plus) a partir de l'energie contenue dans divers effluents industriels dont la temperature de rejet evolue entre 60 et 80 °C; il fonctionne avec le couple H 2 O-NH 3 .
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This paper reconsiders the Novikov and Curzon–Ahlborn power plant model in a completed form. The optimization of the proposed plant is done and comparison of various control volumes (converter; engine; engine with heat source and sink; or... more
This paper reconsiders the Novikov and Curzon–Ahlborn power plant model in a completed form. The optimization of the proposed plant is done and comparison of various control volumes (converter; engine; engine with heat source and sink; or system: system in the environment) with respect to two objectives functions, power, and created entropy rates. Maximum power condition differs generally from minimum entropy generation rates. Moreover, a differentiation is enlightened concerning Angulo-Brown and Yan ecological criterions.
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ULe fonctionnement en regime instationnaire des echangeurs de chaleur est une realite quotidienne rencontree sur les systemes thermiques exploitant ces equipements. Une meilleure connaissance des comportements transitoires permet un... more
ULe fonctionnement en regime instationnaire des echangeurs de chaleur est une realite quotidienne rencontree sur les systemes thermiques exploitant ces equipements. Une meilleure connaissance des comportements transitoires permet un controle-commande adapte. Plusieurs approches centrees pour l’essentiel sur les mecanismes physiques, ou a l’oppose, sur une vision systemique permettent l'etude de ces transitoires. Il en ressort le concept fondamental de constante de temps, complete par la notion de temps de retard (voire de dephasage). L’utilite de ces approches est montree sur des exemples.
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La production de froid et (ou) la revalorisation de la chaleur s’appuie pour l’essentiel sur des machines a cycles inverses ou recepteurs .L’epuisement des ressources energetiques impose de considerer avec attention le potentiel de ces... more
La production de froid et (ou) la revalorisation de la chaleur s’appuie pour l’essentiel sur des machines a cycles inverses ou recepteurs .L’epuisement des ressources energetiques impose de considerer avec attention le potentiel de ces machines . Le present article est un etat de l’art des principes generaux conduisant a la modelisation des machines a cycles inverses.La premiere approche decrite, qui est classique fait appel a la Thermostatique .La deuxieme approche, plus recente, aborde veritablement la Thermodynamique de ces machines. Quelques applications simples sont donnees pour illustrer l’utilite des notions et concepts introduits .La pleine utilite de ceux-ci transparait dans les optimisations de conception, puis dans le controle –commande des machines qui doit suivre.
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La production de froid et (ou) la revalorisation de la chaleur s’appuie pour l’essentiel sur des machines a cycles inverses ou recepteurs .L’epuisement des ressources energetiques impose de considerer avec attention le potentiel de ces... more
La production de froid et (ou) la revalorisation de la chaleur s’appuie pour l’essentiel sur des machines a cycles inverses ou recepteurs .L’epuisement des ressources energetiques impose de considerer avec attention le potentiel de ces machines . Le present article est un etat de l’art des principes generaux conduisant a la modelisation des machines a cycles inverses.La premiere approche decrite, qui est classique fait appel a la Thermostatique .La deuxieme approche, plus recente, aborde veritablement la Thermodynamique de ces machines. Quelques applications simples sont donnees pour illustrer l’utilite des notions et concepts introduits .La pleine utilite de ceux-ci transparait dans les optimisations de conception, puis dans le controle –commande des machines qui doit suivre.
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Cet article a pour objet la cryogenie, c’est-a-dire la production et l’utilisation de tres basses temperatures. Differents moyens pour atteindre ces basses temperatures sont presentes, notamment la cascade de fluides judicieusement... more
Cet article a pour objet la cryogenie, c’est-a-dire la production et l’utilisation de tres basses temperatures. Differents moyens pour atteindre ces basses temperatures sont presentes, notamment la cascade de fluides judicieusement choisie, le cycle de Stirling avec l’air liquide, puis l’helium liquide (fluide frigorigene souffrant de rarete). Sont ensuite abordes les principes de la desaimantation nucleaire, puis celui de la machine frigorifique magnetique, avant d’evoquer quelques perspectives sur ce sujet tres loin d’etre epuise.
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L'article est consacre aux nouveaux developpements de la thermodynamique phenomenologique irreversible et tout particulierement de ses applications en sciences de l'ingenieur .Apres un court historique, on reconsidere les... more
L'article est consacre aux nouveaux developpements de la thermodynamique phenomenologique irreversible et tout particulierement de ses applications en sciences de l'ingenieur .Apres un court historique, on reconsidere les transferts thermiques ,puis la conversion d'energie. Des resultats ameliores en resultent en particulier en termes d'efficacite. L'originalite de cet article est dans la proposition etayee d'une thermodynamique optimale en dimensions finies TDPF.
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Parmi les configurations utilisant les changements de phases figurent les machines a sorption (absorption , adsorption ) mais aussi les machines a ejecteurs. Quelques machines a gaz permanent sont aussi decrites , dont le tube de... more
Parmi les configurations utilisant les changements de phases figurent les machines a sorption (absorption , adsorption ) mais aussi les machines a ejecteurs. Quelques machines a gaz permanent sont aussi decrites , dont le tube de Ranque-Hilsch , les pulse tubes et machines acoustiques. La derniere categorie etudiee est celle qui utilise les effets thermoelectriques. Ces trois ensembles sont les plus importants vu leur impact industriel. Neanmoins le panorama ne serait pas complet si on ne citait pas les nouvelles configurations emergentes telles que les configurations thermomagnetiques
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This paper focuses on the finite physical dimensions thermodynamics (FPDT) based design of combined endoreversible power and refrigeration cycles (CCHP). Four operating schemes were analyzed, one for summer season and three for winter... more
This paper focuses on the finite physical dimensions thermodynamics (FPDT) based design of combined endoreversible power and refrigeration cycles (CCHP). Four operating schemes were analyzed, one for summer season and three for winter season. These basic CCHP cycles should define the reference ones, having the maximum possible energy and exergy efficiencies considering real restrictive conditions. The FPDT design is an entropic approach because it is defining and using the dependences between the reference entropy and the control operational parameters characterizing the external energy interactions of CCHP subsystems. The FPDT introduces a generalization of CCHP systems design, due to the particular influences of entropy variations of the working fluids are substituted with influences of four operational finite dimensions control parameters, i.e. two mean log temperature differences between the working fluids and external heat sources and two dimensionless thermal conductance inventories. Two useful energy interactions, power and cooling rate were used as operational restrictive conditions. It was assumed that there are consumers required for the supplied heating rates depending on the energy operating scheme. The FPDT modeling evaluates main thermodynamic and heat transfers performances. The FPDT model presented in this paper is a general one, applicable to all endoreversible trigeneration cycles. The FPDT design model of the trigeneration component endoreversible cycles emphasizes the cycle internal relationships between the operational functions and the restrictive imposed variable finite physical dimension parameters.
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The internal combustion engine (ICE) is more or less directly present in everyone’s daily life. It is of particular interest in transportation, and hence in the automobile industry.
Research Interests: Chemistry and Combustion
Boltzmann’s equation has been integrated for electrons describing trajectories in a radial electrostatic field (electron–electron and electron–residual‐gas interactions are neglected). One‐particle distribution functions are deduced for... more
Boltzmann’s equation has been integrated for electrons describing trajectories in a radial electrostatic field (electron–electron and electron–residual‐gas interactions are neglected). One‐particle distribution functions are deduced for electrons describing, respectively, stable and unstable trajectories. Evolution of ionization efficiency of the device with various parameters is calculated using the preceding distributions. Experiments allow us to determine the integration constants and to validate theoretical predictions.
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Research Interests: Engineering, Environmental Science, Chemistry, Economics, Waste Management, and 14 moreClean energy technologies, Organic rankine cycle, Waste Heat, Applied Energy, Engineering Technology, Evaporator, Fuel efficiency, Exploit, TURBOFAN ENGINE, Superheater, Thermal Efficiency, Electrical And Electronic Engineering, Superheating, and Waste heat recovery unit
Optimum ionizing efficiency in an orbitron is strongly dependant on end-effects; they disturb the radial electrostatic field, affect the sensitivity of the device and, at the same time, the optimum positioning of the electron emitter. The... more
Optimum ionizing efficiency in an orbitron is strongly dependant on end-effects; they disturb the radial electrostatic field, affect the sensitivity of the device and, at the same time, the optimum positioning of the electron emitter. The ionizing efficiency also depends on space charge effects. The influence of end-effects in an orbitron varies considerably with the electronic current: it is relatively important for small current (for instance in an ionization gauge for ultrahigh vacuum), and less important at high electronic current (as in an ionic pump).
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ABSTRACT An analytical model has been developed to evaluate "displacer gap losses" in the clearance between the displacer and the cylinder in both β and γ configurations of Stirling engines. Displacer gap losses are the... more
ABSTRACT An analytical model has been developed to evaluate "displacer gap losses" in the clearance between the displacer and the cylinder in both β and γ configurations of Stirling engines. Displacer gap losses are the sum of the "shuttle heat transfer" and the "enthalpy pumping". The present model takes into account the pressure gradient in the gap, the gas compressibility and real gas effect. Gas velocity and temperature distributions in the displacer, in the gap and in the cylinder were determined by solving momentum and energy balances in a concentric tubes geometry. Our model is then introduced in a whole engine model and the effect of the clearance thickness and engine's speed on total displacer gap losses are investigated. Novel tendencies of the solution are observed and new ways for optimization are demonstrated.
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Description of performance of inverse cycle machines using adsorption-desorption processes generally involves different modeling techniques with various simplifications owing to the temperature dependence of the physical properties. The... more
Description of performance of inverse cycle machines using adsorption-desorption processes generally involves different modeling techniques with various simplifications owing to the temperature dependence of the physical properties. The corresponding results can be significantly different.The objective of this article is to present a complete and precise thermal model (reference model) using variable physical properties with temperature and particularly latent heat of boiling, isosteric heat of desorption, and specific heat of the working pairs.We compare, for two major criteria (coefficient of performance and cycled mass) and for two working pairs (methanol, ethanol, active charcoals), the accuracies of the various models cited in the literature and the consequences of the simplifying assumptions
Research Interests: Mechanical Engineering, Applied Mathematics, Materials Science, Modeling, Performance, and 15 moreAdsorption, Fossil Fuels, Methanol, Ethanol, Desorption, Mathematical Model, Reference model, Coefficient of Performance, Activated Charcoal, Specific Heat, Energy Source, Physical Properties, Organic Compound, Latent Heat, and Boiling point
Research Interests: Engineering, Nuclear Engineering, Chemistry, Fuel Cells, Waste Management, and 12 moreFuel Cell, Power, Natural Gas, Cogeneration, CHEMICAL SCIENCES, Low Temperature, Electric Power, Boolean Satisfiability, Proton Exchange Membrane Fuel Cell, Thermal Efficiency, Combined Heat and Power, and Power Sources
ABSTRACT Throughout the recent decade, numerous investigations were done on Braysson cycles that were yielded in various output power and thermal efficiency analyses. Throughout the current research, the dimensionless power density and... more
ABSTRACT Throughout the recent decade, numerous investigations were done on Braysson cycles that were yielded in various output power and thermal efficiency analyses. Throughout the current research, the dimensionless power density and thermal efficiency are optimized using NSGA algorithm and finite time thermodynamic analysis. Compares optimum outcomes gained in this paper by executing LINMAP, TOPSIS and Fuzzy Bellman–Zadeh decision makers with relevant outcomes gained in previous works. Furthermore, it was shown that the FUZZY decision-maker provides better solutions in comparison with other implemented decision makers. Finally, analysis of deviation was carried out on the basis of the MAPE technique and it was obtained that the average deviation of results generated by the aforementioned decision maker were 0.015% and 0.03% for the dimensionless power density and thermal efficiency, respectively. The highest deviations of outcomes gained by used decision makers are 0.12% and 0.04% for the thermal efficiency and dimensionless power density, correspondingly. Outcomes of this study may be useful for any further design of Braysson engines. Moreover, optimized results of this research are the basis of further research for comparison and validation.
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Research Interests: Mathematics and Elsevier
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Cet ouvrage de synthese est la reference en energetique. Apres avoir defini l'energetique, la premiere partie du livre est consacree aux outils de l'energetique : principes de la thermodynamique, transfert thermique, combustion,... more
Cet ouvrage de synthese est la reference en energetique. Apres avoir defini l'energetique, la premiere partie du livre est consacree aux outils de l'energetique : principes de la thermodynamique, transfert thermique, combustion, modelisation, simulation... La seconde partie porte sur les principales applications : echangeurs de chaleur, pompes, moteurs thermiques, energie nucleaire, energie solaire... Les aspects scientifiques et techniques sont prolonges par des developpements technologiques et economiques. Le cours est illustre par des photographies et documents techniques de firmes industrielles. Des exercices gradues assurent la maitrise progressive des methodes et notions presentees.
Research Interests: Philosophy and Humanities
This work is part of a program started several years ago, carried out until now by the publication of a series of articles [1, 2] and by the filing of several patent applications [3-5], program through which the authors wish to contribute... more
This work is part of a program started several years ago, carried out until now by the publication of a series of articles [1, 2] and by the filing of several patent applications [3-5], program through which the authors wish to contribute to the fight for environmental protection, by proposing solutions for better use of available energy sources and for the reduction of chemical and, last but not least, thermal pollution of the environment. A first conclusion of this program is that at this stage of the state of the art, due to the fact that they were designed at a time when energy was cheap and the harmful effects on the environment were not yet so obvious, the industries and residential thermotechnical installations currently used, producing significant quantities of entropy, still pay a heavy price in lost exergy. Therefore, an important avenue of attack to achieve the proposed objectives consists of the modification, or progressive replacement, of the usual technical processes in existing thermodynamic installations, even those that use "green" energy, by new processes that consume less exergy. The most important changes, applicable to these installations, must aim at a favorable reduction in temperature differences between the elements of the installation and the environment in which they are located, as well as the use of thermodynamic transformations with minimal generation of entropy. In light of these observations, our research paid particular attention to isothermal transformations.
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This work is a new contribution of the authors to the fight to which researchers from the field of Thermodynamics have joined through significant contributions, to protect the environment in which we operate, for the superior utilization... more
This work is a new contribution of the authors to the fight to which researchers from the field of Thermodynamics have joined through significant contributions, to protect the environment in which we operate, for the superior utilization of available exergy, for finding new sources of energy more environmentally friendly, to reduce chemical and thermal pollution on our planet. A formidable weapon in this fight can become the isothermalizer [1], an intelligent compressor/expander, which self-adjusts its operation in such a way that, for the respective environmental conditions, it destroys the minimum amount of exergy. Compared to similar devices in the state of the art, the isothermalizer has, in addition, only this artificial intelligence with which the designer equips it, therefore its power is also similar to them. Through the present work, the authors come to the support of the designer, showing him some efficient procedures, by which the power of the isothermalizer can exceed, considerably, that of similar devices in the state of the art, without affecting its energy efficiency.
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Ce travail fait partie d'un programme entamé il y a plusieurs années, réalisé jusqu'à présent par la publication d'une série d'articles [1, 2] et par le dépôt de plusieurs demandes de brevet [3-5], programme à travers lequel les auteurs... more
Ce travail fait partie d'un programme entamé il y a plusieurs années, réalisé jusqu'à présent par la publication d'une série d'articles [1, 2] et par le dépôt de plusieurs demandes de brevet [3-5], programme à travers lequel les auteurs souhaitent contribuer à la lutte pour la protection de l'environnement, en proposant des solutions pour une meilleure utilisation des sources d'énergie disponibles et pour la réduction de la pollution chimique et pour finir, mais pas des moindres, thermique de l'environnement. Une première conclusion de ce programme est qu'à ce stade de l'état de la technique, du fait qu'ils ont été conçus à une époque où l'énergie était bon marché et où les effets néfastes sur l'environnement n'étaient pas encore aussi évidents, les industries et les installations thermotechniques résidentielles actuellement utilisées, produisant des quantités importantes d'entropie, paient encore un lourd tribut en exergie perdue. Par conséquent, une voie d'attaque importante pour atteindre les objectifs proposés consiste en la modification, ou le remplacement progressif, des procédés techniques habituels dans les installations thermodynamiques existantes, même celles qui utilisent de l'énergie « verte », par de nouveaux procédés moins consommateurs d'exergie. Les changements les plus importants, applicables à ces installations, doivent viser une réduction favorable des écarts de température entre les éléments de l'installation et l'environnement dans lequel ils se trouvent, ainsi que l'utilisation de transformations thermodynamiques avec génération minimale d'entropie. À la lumière de ces observations, nos recherches ont porté une attention particulière aux transformations isothermiques. Mots clés : transformation isothermique, différences finies de température, efficacité énergétique, efficacité exergétique, transformations irréversibles, génération d'entropie