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The Elastocaloric Subcooling An Innovative Approach To Improve The Energy Performances Of A Transcritical Co Sub 2 Refrigeration System
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Book Synopsis The Elastocaloric Subcooling: an Innovative Approach to Improve the Energy Performances of a Transcritical CO [sub] 2 Refrigeration System by : Anatoliy Rozhok
Download or read book The Elastocaloric Subcooling: an Innovative Approach to Improve the Energy Performances of a Transcritical CO [sub] 2 Refrigeration System written by Anatoliy Rozhok and published by . This book was released on 2020 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's thesis theoretically investigates the possibilities of enhancing the energy performance of CO [sub] 2 transcritical refrigeration systems using an elastocaloric subcooler and expander. For this purpose, new cycle configurations are proposed and analysed through a new computational model developed in Matlab. Among the three different cycle modifications proposed, the "all in one" solution, which includes both the expander and elastocaloric subcooler provides the best results in term of energy efficiency improvement. For a specific working condition characterised by the evaporating level of -15 °C and environment temperature of 35 °C the COP and cooling power improvements, compared to the baseline system, are 19% and 18%, respectively. In addition, according to a simplified estimation, the COP could be further increased by about 3% in the case the direct expansion is employed (where energy conversion losses are neglected). At the end, the simulations have shown that the efficiency of the heat exchange, the elastocaloric subcooler and CO2 expander are key points to further improve the performance of the entire system.
Book Synopsis Coupled Power-Refrigeration Cycle by : Maneesh Dubey
Download or read book Coupled Power-Refrigeration Cycle written by Maneesh Dubey and published by LAP Lambert Academic Publishing. This book was released on 2010 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the large difference in demand and supply of electrical energy, power cut leads to interruption in the working of cold storages which ultimately results in spoilage of vegetables. Compression refrigeration cycles are widely used in cold storages due to the higher coefficient of performance over other refrigeration systems. The most significant energy consumer of compression refrigeration system is electric motor which drives the compressor. Environmental concerns such as ozone depletion and global warming have directed the research trend towards the emergence of new refrigeration technologies. The objective of this work is to provide an energy efficient alternate cooling technology which can utilize renewable energy sources for its operation. In this regard, coupling of organic Rankine cycle and compression refrigeration cycle along with performance augmentation by well known technologies is proposed. The coupled power-refrigeration cycle uses an eco-friendly refrigerant in the topping power and bottoming refrigeration loop. This work presents energy and exergy analysis of a coupled power-refrigeration cycle along with modified configurations.
Book Synopsis Refrigerant Subcooling by : Pacific Northwest Laboratory
Download or read book Refrigerant Subcooling written by Pacific Northwest Laboratory and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants by : Bahaa Morad
Download or read book Analysis of Innovative Vapor Compression and Thermal Energy Storage Systems Using Alternative Refrigerants written by Bahaa Morad and published by . This book was released on 2016 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This research presents detailed analyses of innovative single and two stages vapor compression refrigeration cycles (VCRCs) as well as a cold thermal energy system (CTES) for residential and commercial cooling applications. Different subcooling systems, such as dedicated mechanical subcooling (DMSC) and liquid-vapor heat exchangers (LVHX) using various refrigerants are investigated and analyzed. Results indicate that subcooling systems have great impacts on increasing the overall energetic and exergetic COPs of VCRC. The energetic and the exergetic COPs of the single stage VCRC with LVHX using R134a are 5.50 and 0.178, respectively. Whereas, for the innovative two stages VCRC with DMSC systems and R134a, energetic end exegetic COPs are found to be 5.83 and 0.189, respectively. A direct contact heat transfer CTES system using R134a-clathrate as a storage medium is investigated experimentally on a single-stage VCRC at different operating conditions. Some of the investigated operating conditions used to evaluate the storage medium behavior (clathrate) and the overall system performance are compressor speed, refrigerant mass flow rate, and different water to refrigerant mass ratios. Using R134a, it is found that at lower refrigerant mass flow rate between 0.5 to 0.8 kg/min, the clathrate is formed at longer durations, and COPs of operating cycles are found to be low compared to VCRCs. At a higher mass flow rate of 1.2 kg/min, the COPs of the CTES systems are found to be between 11.81 and 11.85, which is higher than the corresponding single stage VCRCs with LVHX by 42.5 to 44.5% and higher that the VCRC with DMSC by 41.3% to 43%. Current results show that at lower compressor speed of 2100 rpm and constant R-134a mass flow rate of 1.2 kg/sec, the COP is improved by 17%; whereas, at higher compressor speed of 2900 rpm, the COP is decreased by 23%. At higher water/R134a mass ratios in the crystallizer (storage tank), COPs are found to be decreasing due to the increase in charging times needed to form the clathrate compared to all other cases. Finally, the experimental and simulation results indicate that the CTES systems have higher COPs as compared to innovative VCRCs."--Abstract.
Book Synopsis Advances in Finite Time Thermodynamics by : Lingen Chen
Download or read book Advances in Finite Time Thermodynamics written by Lingen Chen and published by Nova Publishers. This book was released on 2004 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over 170 years ago, Sadi Carnot, a French engineer, published his famous article "Reflections on the motive power of fire" and established a new field of science: classical thermodynamics. Since 1985, the scholars in the Naval University of Engineering (from 1949 to 1998) have been making the research work in the field of finite time thermodynamics. This multi-authored book deals with the recent advances of finite time thermodynamics in the Naval University of Engineering. It illustrates how the gap between thermodynamics, heat transfer, and fluid mechanics is bridged. It also illustrates how the gap between physics and engineering is bridged. The readers should find the papers informative and useful for analysis and design of thermodynamic systems with improved performance. The authors hope that this collection of work devoted to finite thermodynamics will provide encouragement for further research in the field.
Book Synopsis Refrigeration Technology by : Ze-Zhao Hua
Download or read book Refrigeration Technology written by Ze-Zhao Hua and published by Alpha Science International, Limited. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book will be useful for both university students and the professionals working in the field of refrigeration. --Book Jacket.
Book Synopsis Essentials and Applications of Food Engineering by : C. Anandharamakrishnan
Download or read book Essentials and Applications of Food Engineering written by C. Anandharamakrishnan and published by CRC Press. This book was released on 2019-03-15 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: Essentials & Applications of Food Engineering provides a comprehensive understanding of food engineering operations and their practical and industrial utility. It presents pertinent case studies, solved numerical problems, and multiple choice questions in each chapter and serves as a ready reference for classroom teaching and exam preparations. The first part of this textbook contains the introductory topics on units and dimensions, material balance, energy balance, and fluid flow. The second part deals with the theory and applications of heat and mass transfer, psychrometry, and reaction kinetics. The subsequent chapters of the book present the heat and mass transfer operations such as evaporation, drying, refrigeration, freezing, mixing, and separation. The final section focuses on the thermal, non-thermal, and nanotechnology-based novel food processing techniques, 3D food printing, active and intelligent food packaging, and fundamentals of CFD modeling. Features Features 28 case studies to provide a substantial understanding of the practical and industrial applications of various food engineering operations Includes 178 solved numerical problems and 285 multiple choice questions Highlights the application of mass balance in food product traceability and the importance of viscosity measurement in a variety of food products Provides updated information on novel food processing techniques such as cold plasma, 3D food printing, nanospray drying, electrospraying, and electrospinning The textbook is designed for undergraduate and graduate students pursuing Food Technology and Food Process Engineering courses. This book would also be of interest to course instructors and food industry professionals.
Author :Gadhiraju Venkatarathnam Publisher :Springer Science & Business Media ISBN 13 :0387785140 Total Pages :262 pages Book Rating :4.3/5 (877 download)
Book Synopsis Cryogenic Mixed Refrigerant Processes by : Gadhiraju Venkatarathnam
Download or read book Cryogenic Mixed Refrigerant Processes written by Gadhiraju Venkatarathnam and published by Springer Science & Business Media. This book was released on 2008-12-10 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most conventional cryogenic refrigerators and liquefiers operate with pure fluids, the major exception being natural gas liquefiers that use mixed refrigerant processes. The fundamental aspects of mixed refrigerant processes, though very innovative, have not received the due attention in open literature in view of commercial interests. Hundreds of patents exist on different aspects of mixed refrigerant processes. However, it is difficult to piece together the existing information to choose an appropriate process and an optimum composition or a given application. The aim of the book is to teach (a.) the need for refrigerant mixtures, (b.) the type of mixtures that can be used for different refrigeration and liquefaction applications, (c.) the different processes that can be used and (d.) the methods to be adopted for choosing the components of a mixture and their concentration for different applications.
Book Synopsis Modern Thermodynamics by : Jitao Wang
Download or read book Modern Thermodynamics written by Jitao Wang and published by Springer Science & Business Media. This book was released on 2011-10-15 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Modern Thermodynamics- Based on the Extended Carnot Theorem" provides comprehensive definitions and mathematical expressions of both classical and modern thermodynamics. The goal is to develop the fundamental theory on an extended Carnot theorem without incorporating any extraneous assumptions. In particular, it offers a fundamental thermodynamic and calculational methodology for the synthesis of low-pressure diamonds. It also discusses many "abnormal phenomena", such as spiral reactions, cyclic reactions, chemical oscillations, low-pressure carat-size diamond growth, biological systems, and more. The book is intended for chemists and physicists working in thermodynamics, chemical thermodynamics, phase diagrams, biochemistry and complex systems, as well as graduate students in these fields. Jitao Wang is a professor emeritus at Fudan University, Shanghai, China.
Author :Charles Coulston Gillispie Publisher :Springer Science & Business Media ISBN 13 :9401780110 Total Pages :495 pages Book Rating :4.4/5 (17 download)
Book Synopsis Lazare and Sadi Carnot by : Charles Coulston Gillispie
Download or read book Lazare and Sadi Carnot written by Charles Coulston Gillispie and published by Springer Science & Business Media. This book was released on 2014-02-03 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lazare Carnot was the unique example in the history of science of someone who inadvertently owed the scientific recognition he eventually achieved to earlier political prominence. He and his son Sadi produced work that derived from their training as engineering and went largely unnoticed by physicists for a generation or more, even though their respective work introduced concepts that proved fundamental when taken up later by other hands. There was, moreover, a filial as well as substantive relation between the work of father and son. Sadi applied to the functioning of heat engines the analysis that his father had developed in his study of the operation of ordinary machines. Specifically, Sadi's idea of a reversible process originated in the use his father made of geometric motions in the analysis of machines in general. This unique book shows how the two Carnots influenced each other in their work in the fields of mechanics and thermodynamics and how future generations of scientists have further benefited from their work.
Book Synopsis Cryocoolers 9 by : Ronald G.Jr. Ross
Download or read book Cryocoolers 9 written by Ronald G.Jr. Ross and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 9th International Conference held in Waterville Valley, New Hampshire, June 25-27, 1996
Book Synopsis Equilibrium Structural Parameters by :
Download or read book Equilibrium Structural Parameters written by and published by Elsevier Science. This book was released on 1999-11-30 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The current volume in the series, Vibrational Spectra and Structure, is a single topic volume on gas phase structural parameters. The title of the volume, Equilibrium Structural Parameters, covers the two most common techniques for obtaining gas phase structural parameters: microwave spectroscopy and the electron diffraction technique. Since the quantum chemical method provides equilibrium geometries, the volume is an attempt to provide a connection between the experimental and theoretical parameters. The book provides a review on molecular structure determinations from spectroscopic data using scaled moments of inertia. The limited number of molecules for which equilibrium parameters have been obtained and the requirement of a large number of microwave data needed to obtain the equilibrium structural parameters is noted. Electron diffraction technique is reviewed, along with a description of how this can incorporate structural information from microwave spectroscopy, vibrational spectroscopy, or theoretical calculations to improve the determination of the structural parameters by electron diffraction studies. Also discussed are the theory and methods of microwave spectroscopy, describing in some detail ro and rs structures as well as rm structures and corrections based on ab initio calculations. The accuracy of the molecular geometry predictions by quantum chemical methods is considered in some detail with data presented in graphic rather than tabular form. This makes it possible to readily note the difference in the parameters predicted at the various levels of quantum mechanical calculations. The four authors have provided a coherent description of the various structural parameters obtained experimentally along with treatments needed to extract equilibrium bond distances and angles.
Book Synopsis Heated Water Systems by : Standards Australia (Organization)
Download or read book Heated Water Systems written by Standards Australia (Organization) and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Absorption Chillers and Heat Pumps by : Keith E. Herold
Download or read book Absorption Chillers and Heat Pumps written by Keith E. Herold and published by CRC Press. This book was released on 2016-04-21 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Significantly revised and updated since its first publication in 1996, Absorption Chillers and Heat Pumps, Second Edition discusses the fundamental physics and major applications of absorption chillers. While the popularity of absorption chillers began to dwindle in the United States in the late 1990's, a shift towards sustainability, green buildin
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