Étude et conception de systèmes à efficacité énergétique améliorée fonctionnant au CO2 comme fluide frigorigène PDF Download

Author: Elias Bou Lawz Ksayer
Publisher:
ISBN:
Category :
Languages : fr
Pages : 226

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Book Description
L'accroissement des émissions de gaz à effet de serre a amené l'Union Européenne à établir des politiques de réduction des émissions de ces gaz. Pour ce qui concerne la climatisation automobile, l'Union Européene a décidé d'arrêter l'utilisation des fluides frigorigènes dont le GWP supérieur à 150 pour les nouvelles plate-formes à partir de 2011, et progressivement pour l'ensemble des véhicules neufs à partir de 2017. Le CO2 est un fluide candidat pour remplacer les fluides à GWP élevé. Les propriétés thermodynamiques du CO2 impliquent un cycle frigorifique trans-critique à basses performances énergétiques pour une température de puits supérieure à 31°C. La haute pression peut être optimisée afin de maximiser le COP du système. L’analyse exergétique du cycle montre que les principales pertes de performances proviennent de la détente isenthalpique et de la compression. Le cycle de réfrigération à éjecteur diphasique se présente comme une solution qui réduit ces pertes. Un modèle 1D a été élaboré pour caractériser le fonctionnement de l’éjecteur et dimensionner des éjecteurs afin de les tester sur un banc d’essais. Des essais comparatifs ont été menés sur des cycles de réfrigération à CO2 avec et sans éjecteur. Les principaux résultats des essais sont : quatre stratégies de contrôle expérimentalement vérifiées pour réguler la haute pression et la température d’évaporation via le détendeur électronique et la vanne de contrôle externe du compresseur ; la validation du modèle de la tuyère convergente ; la validation du modèle 1D en testant 18 éjecteurs différents. Le modèle 1D développé a montré que l’éjecteur améliore jusqu’à 12% les performances énergétiques du cycle au CO2.

Author: Ahmed Belasri
Publisher: Springer Nature
ISBN: 9811554447
Category : Technology & Engineering
Languages : en
Pages : 659

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Book Description
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.

Author: France. Commissariat à l'énergie atomique
Publisher:
ISBN:
Category : Fuel cycle
Languages : en
Pages : 192

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Author: Roger Balian
Publisher: Springer Science & Business Media
ISBN: 3540454802
Category : Science
Languages : en
Pages : 626

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Book Description
This popular, often cited text returns in a softcover edition to provide a thorough introduction to statistical physics and thermodynamics, and to exhibit the universal chain of ideas leading from the laws of microphysics to the macroscopic behaviour of matter. A wide range of applications illustrates the concepts, and many exercises reinforce understanding. Volume II applies statistical methods to systems governed by quantum effects, in particular to solid state physics, explaining properties due to the crystal structure or to the lattice excitations or to the electrons. The last chapters are devoted to non-equilibrium processes and to kinetic equations, with many applications included.

Author: American Society of Heating, Refrigerating and Air-Conditioning Engineers
Publisher:
ISBN: 9781883413453
Category : Air conditioning
Languages : en
Pages :

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Author: J. F. Gracey
Publisher: Bailliere Tindall Limited
ISBN: 9780702022586
Category : Medical
Languages : en
Pages : 758

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Book Description
Introducing the 10th Edition of this standard text covering all aspects of meat hygiene, from the production of clean and healthy animals, to the hygienic processing of meat and meat products, and the avoidance of food-borne hazards. This edition has been fully updated and revised to reflect a more integrated "farm to table" approach, and a more international perspective. Includes new material on BSE, a new section on operational hygiene, and more complete treatment of husbandry and ante-mortem issues.

Author: Peter Atkins
Publisher: OUP Oxford
ISBN: 0191647632
Category : Science
Languages : en
Pages : 142

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Book Description
The laws of thermodynamics drive everything that happens in the universe. From the sudden expansion of a cloud of gas to the cooling of hot metal, and from the unfurling of a leaf to the course of life itself - everything is directed and constrained by four simple laws. They establish fundamental concepts such as temperature and heat, and reveal the arrow of time and even the nature of energy itself. Peter Atkins' powerful and compelling introduction explains what the laws are and how they work, using accessible language and virtually no mathematics. Guiding the reader from the Zeroth Law to the Third Law, he introduces the fascinating concept of entropy, and how it not only explains why your desk tends to get messier, but also how its unstoppable rise constitutes the engine of the universe.

Author: Ibrahim Dincer
Publisher: CRC Press
ISBN: 1000158640
Category : Science
Languages : en
Pages : 420

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Book Description
This comprehensive book is a valuable and readable reference text and source for anyone who wishes to learn about food cooling applications and methods of analysis of the heat transfer during these applications.

Author: Chua Kian Jon
Publisher: Springer Nature
ISBN: 981158477X
Category : Technology & Engineering
Languages : en
Pages : 313

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Book Description
This book highlights key recent developments in air conditioning technologies for cooling and dehumidification with the specific objectives to improve energy efficiency and to minimize environmental impact. Today, air conditioning, comprising cooling and dehumidification, is a necessity in commercial and residential buildings and even in many industrial processes. This book provides key update on recent developments in air conditioning systems, cooling cycles and innovative cooling/dehumidification technologies. Key technologies related to cooling include heat-driven absorption and adsorption cooling and water-based dew point evaporative cooling. Technologies connected with dehumidification involve new generations of adsorbent–desiccant dehumidifiers, liquid-based desiccants and membranes that sieve out water vapor from air. Losses in cooling cycles and thermo-economic analysis for a sustainable economy are also judiciously documented.

Author: Ibrahim Din¿er
Publisher: John Wiley & Sons
ISBN: 1119230780
Category : Technology & Engineering
Languages : en
Pages : 990

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Book Description
The definitive text/reference for students, researchers and practicing engineers This book provides comprehensive coverage on refrigeration systems and applications, ranging from the fundamental principles of thermodynamics to food cooling applications for a wide range of sectoral utilizations. Energy and exergy analyses as well as performance assessments through energy and exergy efficiencies and energetic and exergetic coefficients of performance are explored, and numerous analysis techniques, models, correlations and procedures are introduced with examples and case studies. There are specific sections allocated to environmental impact assessment and sustainable development studies. Also featured are discussions of important recent developments in the field, including those stemming from the author’s pioneering research. Refrigeration is a uniquely positioned multi-disciplinary field encompassing mechanical, chemical, industrial and food engineering, as well as chemistry. Its wide-ranging applications mean that the industry plays a key role in national and international economies. And it continues to be an area of active research, much of it focusing on making the technology as environmentally friendly and sustainable as possible without compromising cost efficiency and effectiveness. This substantially updated and revised edition of the classic text/reference now features two new chapters devoted to renewable-energy-based integrated refrigeration systems and environmental impact/sustainability assessment. All examples and chapter-end problems have been updated as have conversion factors and the thermophysical properties of an array of materials. Provides a solid foundation in the fundamental principles and the practical applications of refrigeration technologies Examines fundamental aspects of thermodynamics, refrigerants, as well as energy and exergy analyses and energy and exergy based performance assessment criteria and approaches Introduces environmental impact assessment methods and sustainability evaluation of refrigeration systems and applications Covers basic and advanced (and hence integrated) refrigeration cycles and systems, as well as a range of novel applications Discusses crucial industrial, technical and operational problems, as well as new performance improvement techniques and tools for better design and analysis Features clear explanations, numerous chapter-end problems and worked-out examples Refrigeration Systems and Applications, Third Edition is an indispensable working resource for researchers and practitioners in the areas of Refrigeration and Air Conditioning. It is also an ideal textbook for graduate and senior undergraduate students in mechanical, chemical, biochemical, industrial and food engineering disciplines.