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Contribution A Loptimisation Thermodynamique Et Economique Des Machines A Cycle Inverse A Deux Et Trois Reservoirs De Chaleur
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Book Synopsis Contribution à l'optimisation thermodynamique et économique des machines à cycle inversé à deux et trois réservoirs de chaleur by : Lavinia Grosu
Download or read book Contribution à l'optimisation thermodynamique et économique des machines à cycle inversé à deux et trois réservoirs de chaleur written by Lavinia Grosu and published by . This book was released on 2000 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail représente les résultats de l'auteur obtenues dans le cadre de l'étude doctorale concernant l'optimisation thermodynamique et économique des machines thermiques à cycle inverse à deux et trois réservoirs de chaleur. Dans la première partie du mémoire on présente des modèles thermodynamiques des machines à froid et pompes à chaleur à deux réservoirs (endoréversibles ou irréversibles), en utilisant la thermodynamique en temps fini. On maximise le coefficient de performance et implicitement le rendement exergétique, ce qui corresponde au minimum de création d'entropie interne et externe. L'existence d'un point optimum de fonctionnement est prouvée. L'optimisation est développée pour trois types de réfrigérants: R22, R134a et R7l7, afin d'analyser leur influence sur la performance de la machine et sur les pertes qui apparaissent durant le fonctionnement réel. L’étude du compresseur à piston selon la thermodynamique en temps fini a été nécessaire pour un calcul complet de conception et de fonctionnement des machines thermiques. L'application numérique pour l'ammoniac s'est avérée très intéressante puisque les résultats obtenues coïncident aux valeurs correspondantes à une consommation énergétique minimale obtenue lors d'une étude antérieure. Dans le chapitre 3, les machines à production de froid à compression mécanique de vapeur sont analysées du point de vue thermoéconomique. Un code de calcul est présenté en deux étapes: dans la première on établit la configuration technologique de la machine, partant d'un type de compresseur, on caractérise les points thermodynamiques du cycle de fonctionnement et on détermine le coût globale de la machine; dans la deuxième étape on utilise des corrélations technico-économiques pour l'estimation des coûts d'investissement des différents composants de la machine à froid Ainsi on présente une évaluation continue des coûts et non plus discrète comme dans la première étape de code de calcul. Une application numérique de l'optimisation thermoéconomique est présenté pour une machine à froid à compression mécanique de vapeur de petite taille, en utilisant la Méthode Généralisée du Gradient Réduit Afin d'améliorer le rendement exergétique de la machine, une autre méthode d'optimisation thermoéconomique est développée: la méthode de décomposition qui permet l'optimisation du système globale par une suite d'optimisations locales et qui utilise des corrélations exergoéconomiques pour l'estimation des différents coûts. Il faut souligner la difficulté de l'obtention et de couplage des documents technico-économiques et du développement des corrélations coût - paramètres techniques ou bien exergétiques. Dans la dernière partie de ce mémoire, l'auteur propose une présentation générale des machines trithermes : machines à froid, pompes à chaleur et thermotransformateurs, selon la thermodynamique en temps fini. Trois modélisations sont développées, selon trois adimensionnements possibles, rapportés au réservoir de haute température, de température intermédiaire ou de basse température. Une étude de sensibilité du coefficient de performance en fonction des variables adimensionnées est menée afm de savoir où et comment changer ces variables pour améliorer la performance de la machine. Chaque type de machine est analysé pour deux cas possibles: endoréversible (sans création d'entropie interne) et endo et exoirréversible (avec création d'entropie interne et externe). On développe ensuite des expressions analytiques des pincements optimums de température au niveau des réservoirs qui correspondent an maximum du coefficient de performance des machines à froid, pompes à chaleur et thermotransformateurs. On considère une contrainte conservatrice sur la conductance totale du système ce qui corresponde du point de vue qualitatif à la contrainte conservatrice sur la surface totale d'échange de chaleur ou sur le temps de contact au niveau des réservoirs. L'analyse thermoéconomique des machines trithermes est seulement commencée dans cette étude par l'analyse du cas plus simple des machines dithermes qui représentent des cas limites des modèles présentés. Ces considérations seront utilisées pour une optimisation thermoéconomique des machines trithermes, basée sur la minimisation des irréversibilités internes et externes étant donné que ces irréversibilités ont un impact direct sur le coût de fonctionnement.
Download or read book Electrodialysis written by Taner Yonar and published by BoD – Books on Demand. This book was released on 2020-12-09 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The electrodialysis process, from energy to the environment, offers very important opportunities. Separation of ion content in water, recovery, electrolysis of water, and many other possibilities will be possible with electrodialysis. Electrodialysis is of great importance not only in the efficient use of resources in our world, but also in space studies. In this book on electrodialysis, in 7 chapters, the possibilities offered by the electrodialysis process are discussed in detail and presented to the service of the scientific community.
Download or read book ECOS 2002 written by and published by . This book was released on 2002 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Étude thermodynamique et thermique de machine à cycle inverse à adsorption by : Lingai Luo
Download or read book Étude thermodynamique et thermique de machine à cycle inverse à adsorption written by Lingai Luo and published by . This book was released on 1991 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude thermodynamique, thermique et expérimentale de la machine inverse à adsorption a été réalisée afin d'examiner les couples et les modèles théoriques en vue de l'optimisation des machines à froid par: 1) une étude thermodynamique basée sur une synthèse d'une soixantaine de travaux de littérature pour le choix du couple en vue d'utilisations diverses; 2) une étude théorique précise de modélisation du COP reposant sur le modèle de DUBININ-RADUSHKEVICH pour la comparaison avec les différents modèles de la littérature; 3) une étude de trois modèles transitoires de générateur: un modèle global, un modèle à partir d'une discrétisation radiale du générateur cylindrique et un modèle à partir du comportement d'un grain cylindrique, conduisant à une meilleure représentation des évolutions de température, de masse cyclée ainsi que de la distribution radiale de température pendant la phase d'adsorption et la phase de désorption; 4) une étude expérimentale sur la maquette réalisée en laboratoire avec le couple charbon actif ac35/3-méthanol ou éthanol, débouchant sur une connaissance des températures, pressions et de la masse adsorbée au cours du cycle; 5) une comparaison des modèles théoriques et des résultats expérimentaux permettant la discussion de leurs validités
Book Synopsis Augmentation des performances des échangeurs de chaleur en vue de l'optimisation thermodynamique de la machine de Stirling ; transfert de chaleur en régime instationnaire en milieu poreux by : Monica Costea
Download or read book Augmentation des performances des échangeurs de chaleur en vue de l'optimisation thermodynamique de la machine de Stirling ; transfert de chaleur en régime instationnaire en milieu poreux written by Monica Costea and published by . This book was released on 1997 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: Encadré par la thématique dans le domaine d'intérêt de l'Energétique-Environnement ce travail a abordé une direction de recherche d'actualité centrée sur l'optimisation du moteur de Stirling qui fonctionne selon un cycle avec des irreversibilités internes et externes. La première partie du mémoire rend compte des modèles d'optimisation du cycle avec irreversibilités thermiques et les conséquences sur la distribution de la conductance ou de la surface d'échange entre les échangeurs de chaleur de la machine. Ces modèles ont permis d'étudier l'influence du type de la source et du puits (thermostat ou capacité finie), de la forme de la loi de transfert de chaleur considérée (linéaire ou non linéaire), de la présence du régénérateur (échangeur en co-courant ou contre-courant) par sa conductance ou surface d'échange thermique parmi les variables du modèle, de l'influence des divers paralètres sur les performances de la machine. [...]
Book Synopsis Carnot Cycle and Heat Engine Fundamentals and Applications by : Michel Feidt
Download or read book Carnot Cycle and Heat Engine Fundamentals and Applications written by Michel Feidt and published by MDPI. This book was released on 2020-07-03 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book results from a Special Issue related to the latest progress in the thermodynamics of machines systems and processes since the premonitory work of Carnot. Carnot invented his famous cycle and generalized the efficiency concept for thermo-mechanical engines. Since that time, research progressed from the equilibrium approach to the irreversible situation that represents the general case. This book illustrates the present state-of-the-art advances after one or two centuries of consideration regarding applications and fundamental aspects. The research is moving fast in the direction of economic and environmental aspects. This will probably continue during the coming years. This book mainly highlights the recent focus on the maximum power of engines, as well as the corresponding first law efficiency upper bounds.
Book Synopsis Advances in Renewable Hydrogen and Other Sustainable Energy Carriers by : Abdallah Khellaf
Download or read book Advances in Renewable Hydrogen and Other Sustainable Energy Carriers written by Abdallah Khellaf and published by Springer Nature. This book was released on 2020-08-19 with total page 517 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines a broad range of advances in hydrogen energy and alternative fuel developments and their role in the energy transition. The respective contributions were presented at the International Symposium on Sustainable Hydrogen, held in Algiers, Algeria on November 27-28, 2019. The transition from non-renewable polluting energy to sustainable green energy requires not only new energy sources but also new storage techniques and smart energy management. This situation has sparked renewed interest in hydrogen and alternative fuels, as they could help meet these needs. Indeed, hydrogen can not only be used as a clean energy vector or as an alternative fuel, but also as a storage medium or as an intermediary that enables improved energy management. This text offers a valuable reference guide for those working in the professional energy sector, as well as for students and instructors in academia who want to learn about the state of the art and future directions in the fields of hydrogen energy, alternative fuels and sustainable energy development.
Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.
Book Synopsis Faecal Sludge Management by : Linda Strande
Download or read book Faecal Sludge Management written by Linda Strande and published by IWA Publishing. This book was released on 2014-08-15 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is estimated that literally billions of residents in urban and peri-urban areas of Africa, Asia, and Latin America are served by onsite sanitation systems (e.g. various types of latrines and septic tanks). Until recently, the management of faecal sludge from these onsite systems has been grossly neglected, partially as a result of them being considered temporary solutions until sewer-based systems could be implemented. However, the perception of onsite or decentralized sanitation technologies for urban areas is gradually changing, and is increasingly being considered as long-term, sustainable options in urban areas, especially in low- and middle-income countries that lack sewer infrastructures. This is the first book dedicated to faecal sludge management. It compiles the current state of knowledge of the rapidly evolving field of faecal sludge management, and presents an integrated approach that includes technology, management, and planning based on Sandecs 20 years of experience in the field. Faecal Sludge Management: Systems Approach for Implementation and Operation addresses the organization of the entire faecal sludge management service chain, from the collection and transport of sludge, and the current state of knowledge of treatment options, to the final end use or disposal of treated sludge. The book also presents important factors to consider when evaluating and upscaling new treatment technology options. The book is designed for undergraduate and graduate students, and engineers and practitioners in the field who have some basic knowledge of environmental and/or wastewater engineering.
Book Synopsis Ion Exchange Technologies by : Ayben Kilislioglu
Download or read book Ion Exchange Technologies written by Ayben Kilislioglu and published by BoD – Books on Demand. This book was released on 2012-11-07 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains information about the technological development of ion exchange in their application for industrial processes. Widely used and well known fields of ion exchange like chromatography and electromembrane technology are described in this book with experimental details. Designing new materials for nanotechnology and nanomaterials as ion exchanger are also explained by experimental proofs. Ion exchange book is suitable not only for postgraduate students but also for researchers in chemistry, biochemistry and chemical technology.
Book Synopsis Applications of High-Tc Superconductivity by : Adir Moysés Luiz
Download or read book Applications of High-Tc Superconductivity written by Adir Moysés Luiz and published by . This book was released on 2011 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of the chapters intended to study only practical applications of HTS materials. You will find here a great number of research on actual applications of HTS as well as possible future applications of HTS. Depending on the strength of the applied magnetic field, applications of HTS may be divided in two groups: large scale applications (large magnetic fields) and small scale applications (small magnetic fields). 12 chapters in the book are fascinating studies about large scale applications as well as small scale applications of HTS. Some chapters are presenting interesting research on the synthesis of special materials that may be useful in practical applications of HTS. There are also research about properties of high-Tc superconductors and experimental research about HTS materials with potential applications. The future of practical applications of HTS materials is very exciting. I hope that this book will be useful in the research of new radical solutions for practical applications of HTS materials and that it will encourage further experimental research of HTS materials with potential technological applications.
Book Synopsis Atomic Force Microscopy by : Victor Bellitto
Download or read book Atomic Force Microscopy written by Victor Bellitto and published by . This book was released on 2012 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the advent of the atomic force microscope (AFM) came an extremely valuable analytical resource and technique useful for the qualitative and quantitative surface analysis with sub-nanometer resolution. In addition, samples studied with an AFM do not require any special pretreatments that may alter or damage the sample and permits a three dimensional investigation of the surface. This book presents a collection of current research from scientists throughout the world that employ atomic force microscopy in their investigations. The technique has become widely accepted and used in obtaining valuable data in a wide variety of fields. It is impressive to see how, in a short time period since its development in 1986, it has proliferated and found many uses throughout manufacturing, research and development.
Book Synopsis Low-profile Natural and Metamaterial Antennas by : Hisamatsu Nakano
Download or read book Low-profile Natural and Metamaterial Antennas written by Hisamatsu Nakano and published by John Wiley & Sons. This book was released on 2016-10-03 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents recent progress in low-profile natural and metamaterial antennas This book presents the full range of low-profile antennas that use novel elements and take advantage of new concepts in antenna implementation, including metamaterials. Typically formed by constructing lattices of simple elements, metamaterials possess electromagnetic properties not found in naturally occurring materials, and show great promise in a number of low-profile antenna implementations. Introductory chapters define various natural and metamaterial-based antennas and provide the fundamentals of writing computer programs based on the method of moments (MoM) and the finite-difference time-domain method (FDTDM). Chapters then discuss low-profile natural antennas classified into base station antennas, mobile card antennas, beam-forming antennas, and satellite-satellite and earth-satellite communications antennas. Final chapters look at various properties of low-profile metamaterial-based antennas, revealing the strengths and limitations of the metamaterial-based straight line antenna (metaline antenna), metamaterial-based loop antenna (metaloop), open metaloop antenna, the effects of counter dual-band CP radiation, and more. Offers comprehensive coverage of both metamaterials and natural materials for low-profile antennas Written by an internationally-recognized expert in the field of low-profile antennas Depicts actual high-performance low-profile antennas for the antenna engineer Draws on classroom-tested material in graduate courses and short courses over the past 20 years Low-Profile Natural and Metamaterial Antennas is a must-have reference book for advanced undergraduate and graduate level students as well as antenna engineers interested in low-profile antenna design theory.
Book Synopsis Modern Surface Organometallic Chemistry by : Jean-Marie Basset
Download or read book Modern Surface Organometallic Chemistry written by Jean-Marie Basset and published by John Wiley & Sons. This book was released on 2009-07-10 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covering everything from the basics to recent applications, this monograph represents an advanced overview of the field. Edited by internationally acclaimed experts respected throughout the community, the book is clearly divided into sections on fundamental and applied surface organometallic chemistry. Backed by numerous examples from the recent literature, this is a key reference for all chemists.
Book Synopsis MICHEL SERRES by : Christopher Watkin
Download or read book MICHEL SERRES written by Christopher Watkin and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Saints of the Atlas by : Ernest Gellner
Download or read book Saints of the Atlas written by Ernest Gellner and published by ACLS History E-Book Project. This book was released on 2008-11 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis How to Design Wastewater Systems for Local Conditions in Developing Countries by : David M. Robbins
Download or read book How to Design Wastewater Systems for Local Conditions in Developing Countries written by David M. Robbins and published by IWA Publishing. This book was released on 2014-03-15 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a practical handbook providing a step-by-step approach to the techniques used for characterizing wastewater sources and investigating sites where collection, treatment and reuse/disposal technologies will be installed. It is intended to help enable local implementation of on-site and decentralized wastewater management system (DWMS)for wide scale use in development settings. How to Design Wastewater Systems for Local Conditions in Developing Countries helps local service providers and regulatory officials make informed decisions through the use of tools, checklists and case studies. It includes a link to a web based community of on-site and decentralized wastewater professionals, which contains related tools and case studies. This handbook serves as a reference for training classes, certification programs, and higher education programs in civil and sanitary engineering. There is an increasing interest on the part of local government officials and private sector service providers to implement wastewater treatment systems to solve sanitation problems. The model presented in this handbook promotes activities that first generate data related to source and site conditions that represent critical inputs, and then applies this information to the technology selection process. Matching the most appropriate technologies to the specific needs of the wastewater project is the key that leads to long term sustainability. How to Design Wastewater Systems for Local Conditions in Developing Countries is an invaluable resource for public sector decision makers and private sector service providers in developing countries. It is also a useful text for students at engineering colleges in developing countries interested in taking a class that teaches the methods of decentralized wastewater management system (DWMS) development.
