Ejectors for Efficient Refrigeration

Ejectors for Efficient Refrigeration

Encompassing both practical applications and recent research developments, this book takes the reader from fundamental physics, through cutting-edge new designs of ejectors for refrigeration.

Author: Giuseppe Grazzini

Publisher: Springer

ISBN: 9783319752440

Category: Technology & Engineering

Page: 180

View: 141

Encompassing both practical applications and recent research developments, this book takes the reader from fundamental physics, through cutting-edge new designs of ejectors for refrigeration. The authors’ unique vision marries successful design, system optimization, and operation experience with insights on the application of cutting-edge Computational Fluid Dynamics (CFD) models. This robust treatment leads the way forward in developing improved ejector technologies. The book covers ejectors used for heat powered refrigeration and for expansion work recovery in compression refrigerators, with special emphasis on two-phase flows of “natural” fluids within the ejector, i.e. steam and carbon dioxide. It features worked examples, detailed research results, and analysis tools.
Categories: Technology & Engineering

Water R718 Turbo Compressor and Ejector Refrigeration Heat Pump Technology

Water  R718  Turbo Compressor and Ejector Refrigeration   Heat Pump Technology

The book also examines the technical, economic, and environmental reasons of R718 refrigeration/heat pump systems and how they are competitive with traditional systems, serving as a valuable reference for engineers who work in the design ...

Author: Milan N. Šarevski

Publisher: Butterworth-Heinemann

ISBN: 9780081007341

Category: Science

Page: 304

View: 650

Water (R718) Turbo Compressor and Ejector Refrigeration/Heat Pump Technology provides the latest information on efficiency improvements, a main topic in recent investigations of thermal energy machines, plants, and systems that include turbo compressors, ejectors, and refrigeration/heat pump systems. This, when coupled with environmental concerns, has led to the application of eco-friendly refrigerants and to a renewed interest in natural refrigerants. Within this context, readers will find valuable information that explores refrigeration and heat pump systems using natural refrigerants, polygeneration systems, the energy efficiency of thermal systems, the utilization of low temperature waste heat, and cleaner production. The book also examines the technical, economic, and environmental reasons of R718 refrigeration/heat pump systems and how they are competitive with traditional systems, serving as a valuable reference for engineers who work in the design and construction of thermal plants and systems, and those who wish to specialize in the use of R718 as a refrigerant in these systems. Describes existing novel R718 turbo compressor and ejector refrigeration/heat pump systems and technologies Provides procedures calculating and optimizing cycles, system components, and system structures Estimates the performance characteristics of the thermal systems Exposes the possibilities for wider applications of R718 systems in the field of refrigeration and heat pumps
Categories: Science

Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies

Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies

CLASSIFICATION OF EJECTOR REFRIGERATION CYCLES Categories of Ejector Refrigeration Cycles The discussion below is ... order to increase the pressure of the refrigerant and therefore is a major contributor to the efficiency of the cycle.

Author: Gaspar, Pedro Dinis

Publisher: IGI Global

ISBN: 9781466683990

Category: Technology & Engineering

Page: 468

View: 357

In recent years, the sustainability and safety of perishable foods has become a major consumer concern, and refrigeration systems play an important role in the processing, distribution, and storage of such foods. To improve the efficiency of food preservation technologies, it is necessary to explore new technological and scientific advances both in materials and processes. The Handbook of Research on Advances and Applications in Refrigeration Systems and Technologies gathers state-of-the-art research related to thermal performance and energy-efficiency. Covering a diverse array of subjects—from the challenges of surface-area frost-formation on evaporators to the carbon footprint of refrigerant chemicals—this publication provides a broad insight into the optimization of cold-supply chains and serves as an essential reference text for undergraduate students, practicing engineers, researchers, educators, and policymakers.
Categories: Technology & Engineering

Advanced Energy Efficiency Technologies for Solar Heating Cooling and Power Generation

Advanced Energy Efficiency Technologies for Solar Heating  Cooling and Power Generation

Solar-Driven. Ejector. System. Utilization of the solar energy in refrigeration or cooling applications gains more and more attention in the last years because of the high compatibility between the solar energy supply and the demand, ...

Author: Xudong Zhao

Publisher: Springer

ISBN: 9783030172831

Category: Technology & Engineering

Page: 539

View: 610

This book, based on the research experience and outcomes of a group of international contributors, addresses a range of advanced energy efficiency technologies and their applications in solar heating, cooling and power generation, while also providing solutions for tackling recurring low efficiency problems in today’s systems. It highlights the latest technologies and methods, which can significantly improve the performance of solar systems, enabling readers to design, construct and apply high-performance solar systems in or for their own projects. The contributors provide a systematic introduction to state-of-the-art energy efficiency technologies that demonstrates how to implement innovative solar systems. These technologies include: • heat pipes and loop heat pipes; • phase change materials (PCMs) and PCM slurries; • micro-channel panels; • desiccant/adsorption cycling; • ejector cooling and heat pumps; and • solar concentration and thermoelectric units. The book shows how innovative solar systems applicable to rural and urban buildings can be analysed and demonstrates the successful implementation of these advanced technologies. It delivers the design principles and associated energy performance assessment methods for a range of selected solar heating, cooling and power generation projects. This book offers a valuable source of information for final-year undergraduate students, as well as graduate students and academic lecturers, as it promotes the widespread deployment of advanced solar heating, cooling and power generation technologies applicable for buildings across the globe. The book is also a good point of reference for design engineers and energy consultants who wish to extend their knowledge of advanced technologies used to achieve energy efficiency.
Categories: Technology & Engineering

Energy Efficiency and Management in Food Processing Facilities

Energy Efficiency and Management in Food Processing Facilities

Variable geometry ejectors and their applications in ejector refrigeration systems. Energy 21:919–929. Sun, D.W. 1997a. Solar powered combined ejector-vapor-compression cycle for air conditioning and refrigeration.

Author: Lijun Wang

Publisher: CRC Press

ISBN: 1420063391

Category: Technology & Engineering

Page: 452

View: 479

Energy efficiency, environmental protection, and processing waste management continue to attract increased attention in the food processing industry. As with other industrial sectors, reducing costs while also reducing environmental impact and improving overall sustainability is becoming an important part of the business process. Providing practical guidance, Energy Efficiency and Management in Food Processing Facilities explores energy efficiency technologies, emerging energy efficient processes, and methods for converting food processing wastes into energy. Organized around five central themes, the book explores: Fundamentals of energy conservation, analysis, and management Energy conservation technologies as applied to the food processing industry Energy efficiency and conservations in current food processing systems Emerging systems Energy conversion technologies for utilization of food processing wastes Conservation Techniques that Improve the Bottom Line The lack of information on energy conservation and conversion technologies has been a major barrier to energy efficiency improvement and the utilization of processing wastes in the food processing industry. With coverage ranging from basic theory to traditional and alternative energy, this book provides the required skill set for the increased energy conservation and reduced consumption that will positively impact the bottom line in food processing facilities.
Categories: Technology & Engineering

Energy and Thermal Management Air Conditioning Waste Heat Recovery

Energy and Thermal Management  Air Conditioning  Waste Heat Recovery

Amelioration of Energy Efficiency for Refrigeration Cycles by Means of Ejectors Ahrendts Fabian1(&), Thoma Werner2, and Köhler Jürgen1 1 Institut für Thermodynamik, TU Braunschweig, Brunswick, ...

Author: Christine Junior

Publisher: Springer

ISBN: 9783319471969

Category: Technology & Engineering

Page: 188

View: 184

The volumes includes selected and reviewed papers from the 1st ETA Conference on Energy and Thermal Management, Air Conditioning and Waste Heat Recovery in Berlin, December 1-2, 2016. Experts from university, public authorities and industry discuss the latest technological developments and applications for energy efficiency. Main focus is on automotive industry, rail and aerospace.
Categories: Technology & Engineering

Refrigeration Air Conditioning and Heat Pumps

Refrigeration  Air Conditioning and Heat Pumps

The performance of an ejector for expansion work recovery is commonly described with the aid of 4 metrics, i.e., mass entrainment ratio (ω), suction pressure ratio (D), pressure lift (Plift ) and expansion work recovery efficiency, ...

Author: Fabio Polonara

Publisher: MDPI

ISBN: 9783039438235

Category: Technology & Engineering

Page: 180

View: 970

Refrigeration, air conditioning, and heat pumps (RACHP) have an important impact on the final energy uses of many sectors of modern society, such as residential, commercial, industrial, transport, and automotive. Moreover, RACHP also have an important environmental impact due to the working fluids that deplete the stratospheric ozone layer, which are being phased out according to the Montreal Protocol (1989). Last, but not least, high global working potential (GWP), working fluids (directly), and energy consumption (indirectly) are responsible for a non-negligible quota of greenhouse gas (GHG) emissions in the atmosphere, thus impacting climate change.
Categories: Technology & Engineering

ECOS 2012 The 25th International Conference on Efficiency Cost Optimization and Simulation of Energy Conversion Systems and Processes Perugia June 26th June 29th 2012

ECOS 2012 The 25th International Conference on Efficiency  Cost  Optimization and Simulation of Energy Conversion Systems and Processes  Perugia  June 26th June 29th  2012

References [1]Huang B.J., Chang J.M., Wang C.P., Petrenko V.A., A 1-D analysis of ejector performance. International Journal of Refrigeration 1999;22:354—364. [2]Kamali R.K., Abbassi A., Sadough Vanini S.A., Saffar Avval M., ...

Author: Enrico Sciubba

Publisher: Firenze University Press

ISBN: 8866553220

Category: Energy conservation

Page: 219

View: 634

Categories: Energy conservation

Refrigeration and Air Conditioning

Refrigeration and Air Conditioning

If the motive steam pressure and condenser temperature are constant, then the cooling capacity increases as the chilled water ... Ejectors are not very efficient devices but these are capable of handling large volume flow rates.

Author: Ramesh Chandra Arora

Publisher: PHI Learning Pvt. Ltd.

ISBN: 9788120339156

Category: Air conditioning

Page: 1096

View: 826

The text begins by reviewing, in a simple and precise manner, the physical principles of three pillars of Refrigeration and Air Conditioning, namely thermodynamics, heat transfer, and fluid mechanics. Following an overview of the history of refrigeration, subsequent chapters provide exhaustive coverage of the principles, applications and design of several types of refrigeration systems and their associated components such as compressors, condensers, evaporators, and expansion devices. Refrigerants too, are studied elaboratively in an exclusive chapter. The second part of the book, beginning with the historical background of air conditioning in Chapter 15, discusses the subject of psychrometrics being at the heart of understanding the design and implementation of air conditioning processes and systems, which are subsequently dealt with in Chapters 16 to 23. It also explains the design practices followed for cooling and heating load calculations. Each chapter contains several worked-out examples that clarify the material discussed and illustrate the use of basic principles in engineering applications. Each chapter also ends with a set of few review questions to serve as revision of the material learned.
Categories: Air conditioning

Progress in Refrigeration Science and Technology

Progress in Refrigeration Science and Technology

A very useful tool in calculations of ejectors proves to be ln p-i chart for the refrigerant in question. ... (Fig. l) is the main problem of supersonic ejector design, as fm c seriously affects the ejector efficiency and performance.

Author: Yong Zhou

Publisher: Elsevier

ISBN: 9781483223605

Category: Science

Page: 802

View: 209

Progress in Refrigeration Science and Technology, Volume I is a collection of papers from the Eleventh International Congress of Refrigeration held in Munich in August-September 1963. These papers deal with the various scientific and technical aspects, designs, and technology of refrigeration. One paper explains technological advances in the use of very low temperature fluids, namely liquid hydrogen and liquid helium as rocket fuels, as bubble chambers, in the study of mesons or hyperons, and in experiments involving the reaction of metals in a wide range of temperature. Another paper examines the requirements for improved food refrigeration and the limitations of certain methods when compared to other cold processing forms. Freeze-drying is also used in biology such as in freeze-drying of biological solutions, tissues, or living organisms. One paper explains the purification method for obtaining very pure hydrogen at high pressures to be used in comparative experiments on the thermodynamical properties of ortho- and para-hydrogen, and their mixtures. Another paper investigates the effect of heat exchange between capillary tube and suction line on the performance of small hermetic compressor systems. This collection is suitable for engineers or technologists in the area of refrigeration, as well as for scientists involved in the space industry and materials research.
Categories: Science

Progress in Combustion Diagnostics Science and Technology

Progress in Combustion Diagnostics  Science and Technology

Comparing the compression cooling system of the automobile, the steam ejector refrigeration system has the ... between the performance of the refrigeration system and ejector working characteristics [9] and the efficiency of the steam ...

Author: Paul Medwell

Publisher: MDPI

ISBN: 9783039285105

Category: Technology & Engineering

Page: 336

View: 595

The role that combustion plays in the world’s energy systems will continue to evolve with the changes in technological demands. For example, the challenges that we face today are more focused on the conservation of energy and addressing environmental concerns, which together necessitate cleaner and more efficient combustion processes using a range of fuel sources. This book includes contributions to highlight the recent progress in theory and experiments, development, and demonstration of technologies and systems involving combustion processes, for the production, storage, use, and conservation of energy.
Categories: Technology & Engineering

Advances in Solar Heating and Cooling

Advances in Solar Heating and Cooling

Under peak solar radiation and highest ambient temperature, the COP of the ejector cooling cycle was approximately 0.52e0.547 and the solar collector efficiency ranged between 0.52 and 0.92. In addition, the overall system efficiency ...

Author: Ruzhu Wang

Publisher: Woodhead Publishing

ISBN: 9780081003022

Category: Technology & Engineering

Page: 596

View: 633

Advances in Solar Heating and Cooling presents new information on the growing concerns about climate change, the security of energy supplies, and the ongoing interest in replacing fossil fuels with renewable energy sources. The amount of energy used for heating and cooling is very significant, estimated, for example, as half of final energy consumption in Europe. Solar thermal installations have the potential to meet a large proportion of the heating and cooling needs of both buildings and industry and the number of solar thermal installations is increasing rapidly. This book provides an authoritative review of the latest research in solar heating and cooling technologies and applications. Provides researchers in academia and industry with an authoritative overview of heating and cooling for buildings and industry in one convenient volume Part III, ‘Solar cooling technologies’ is contributed by authors from Shanghai Jiao Tong University, which is a world-leader in this area Covers advanced applications from zero-energy buildings, through industrial process heat to district heating and cooling
Categories: Technology & Engineering

Production at the Leading Edge of Technology

Production at the Leading Edge of Technology

Grazzini, G., Milazzo, A., Mazzelli, F.: Ejectors for Efficient Refrigeration. Springer, Heidelberg (2018). https://doi.org/10.1007/978-3-319-75244-0 6. Krause, J., Stange, G.: Magnetic-inductive flow sensor with variable cross section ...

Author: Bernd-Arno Behrens

Publisher: Springer Nature

ISBN: 9783030784249

Category: Technology & Engineering

Page: 688

View: 965

This congress proceedings provides recent research on leading-edge manufacturing processes. The aim of this scientific congress is to work out diverse individual solutions of "production at the leading edge of technology" and transferable methodological approaches. In addition, guest speakers with different backgrounds will give the congress participants food for thoughts, interpretations, views and suggestions. The manufacturing industry is currently undergoing a profound structural change, which on the one hand produces innovative solutions through the use of high-performance communication and information technology, and on the other hand is driven by new requirements for goods, especially in the mobility and energy sector. With the social discourse on how we should live and act primarily according to guidelines of sustainability, structural change is gaining increasing dynamic. It is essential to translate politically specified sustainability goals into socially accepted and marketable technical solutions. Production research is meeting this challenge and will make important contributions and provide innovative solutions from different perspectives.
Categories: Technology & Engineering

Refrigeration Systems and Applications

Refrigeration Systems and Applications

[26] evaluated the overall transit exergy efficiency as well as the efficiencies within different sections of a single phase ejector for R141b refrigerant. To the authors' best knowledge, no investigation has been reported yet on the ...

Author: Ciro Aprea

Publisher: MDPI

ISBN: 9783039219520

Category: Technology & Engineering

Page: 200

View: 871

The Special Issue “Refrigeration Systems and Applications” aims to encourage researchers to address the concerns associated with climate change and the sustainability of artificial cold production systems, and to further the transition to the more sustainable technologies and methodologies of tomorrow through theoretical, experimental, and review research on the different applications of refrigeration and associated topics.
Categories: Technology & Engineering

Advances in Heat Pump Assisted Drying Technology

Advances in Heat Pump Assisted Drying Technology

A improved rolling piston the COPcooling by 6.6% compared CO2 system, with an isentropic efficiency of to the system using an EXV ... a lot of methods have been proposed, such as using ejectors and refrigerant injection (Chua et al.

Author: Vasile Minea

Publisher: CRC Press

ISBN: 9781315352671

Category: Science

Page: 315

View: 568

Drying of solids is one of the most common, complex, and energy-intensive industrial processes. Conventional dryers offer limited opportunities to increase energy efficiency. Heat pump dryers are more energy and cost effective, as they can recycle drying thermal energy and reduce CO2, particulate, and VOC emissions due to drying. This book provides an introduction to the technology and current best practices and aims to increase the successful industrial implementation of heat pump- assisted dryers. It enables the reader to engage confidently with the technology and provides a wealth of information on theories, current practices, and future directions of the technology. It emphasizes several new design concepts and operating and control strategies, which can be applied to improve the economic and environmental efficiency of the drying process. It answers questions about risks, advantages vs. disadvantages, and impediments and offers solutions to current problems. Discusses heat pump technology in general and its present and future challenges. Describes interesting and promising innovations in drying food, agricultural, and wood products with various heat pump technologies. Treats several technical aspects, from modeling and simulation of drying processes to industrial applications. Emphasizes new design concepts and operating and control strategies to improve the efficiency of the drying process.
Categories: Science

Recent Advances in Renewable Energy Technologies

Recent Advances in Renewable Energy Technologies

Theoretical studies of the solar-assisted two-stage ejector refrigeration system were suggested by Wang and Tang [132]. ... for ejector cooling cycles led to lower COP; also, R134a achieves the best efficiency by considering all safety ...

Author: Mejdi Jeguirim

Publisher: Academic Press

ISBN: 9780323919517

Category: Science

Page: 456

View: 241

Recent Advances in Renewable Energy Technologies is a comprehensive reference covering critical research, laboratory and industry developments on renewable energy technological, production, conversion, storage, and management, including solar energy systems (thermal and photovoltaic), wind energy, hydropower, geothermal energy, bioenergy and hydrogen production, and large-scale development of renewable energy technologies and their impact on the global economy and power capacity. Technological advancements include resources assessment and deployment, materials performance improvement, system optimization and sizing, instrumentation and control, modeling and simulation, regulations, and policies. Each modular chapter examines recent advances in specific renewable energy systems, providing theoretical and applied aspects of system optimization, control and management and supports them with global case studies demonstrating practical applications and economical and environmental aspects through life cycle analysis. The book is of interest to engineering graduates, researchers, professors and industry professionals involved in the renewable energy sector and advanced engineering courses dealing with renewable energy, sources, thermal and electrical energy production and sustainability. Focuses on the progress and research trends in solar, wind, biomass, and hydropower and geothermal energy production and conversion. • Includes advanced techniques for the distribution, management, optimization, and storage of heat and energy using case studies.
Categories: Science

Re engineering Manufacturing for Sustainability

Re engineering Manufacturing for Sustainability

It follows from Eq. (5) that the conversion efficiency of a vacuum ejector is: ζ E3 E1 ζ m3T3‐T0 cpig ‐ T0 cp ig ln T3 ... This is originated from the application of these definitions in the field of refrigeration technology where other ...

Author: Andrew Y. C. Nee

Publisher: Springer Science & Business Media

ISBN: 9789814451482

Category: Technology & Engineering

Page: 738

View: 473

This edited volume presents the proceedings of the 20th CIRP LCE Conference, which cover various areas in life cycle engineering such as life cycle design, end-of-life management, manufacturing processes, manufacturing systems, methods and tools for sustainability, social sustainability, supply chain management, remanufacturing, etc.
Categories: Technology & Engineering

CFD Simulation and Shape Optimization of Supersonic Ejectors for Refrigeration and Desalination Applications

CFD Simulation and Shape Optimization of Supersonic Ejectors for Refrigeration and Desalination Applications

The aim of this thesis is to investigate the detailed flow field inside the supersonic ejector using numerical methods and to optimize the ejector's mixing chamber wall shape to obtain a maximum entrainment ratio (ER) in order to obtain the ...

Author: Liju Su

Publisher:

ISBN: OCLC:922710672

Category: Electronic dissertations

Page: 105

View: 415

The aim of this thesis is to investigate the detailed flow field inside the supersonic ejector using numerical methods and to optimize the ejector's mixing chamber wall shape to obtain a maximum entrainment ratio (ER) in order to obtain the highest possible efficiency that can be attained by the ejector. A steam ejector applied in the cooling industry is first studied to determine the most accurate turbulence model for its supersonic jet flow field simulation with mixing with the entrained steam in the mixing chamber. A commercial Computational Fluid Dynamics (CFD) package FLUENT 14.5 along with the meshing tool ICEM 14.5 is utilized to conduct the modeling and simulation to examine the ejector performance using two different turbulence models: k-[epsilon] realizable and k-[omega] SST. Velocity contours, pressure plots and entrainment ratio plots obtained from FLUENT are studied to investigate the effects of several ejector operating conditions as well as to verify the turbulence model accuracy by comparing the numerical results with experimental data. Simulations for three different supersonic ejectors (ejectors for refrigeration and desalination application with different working fluids namely the steam or compressed air) are conducted to further validate the numerical solution accuracy. The turbulence model producing more accurate results is applied to all three cases. In second part of the thesis, a single objective genetic algorithm (SOGA) is employed to optimize the mixing chamber wall shape for steam ejector for refrigeration to achieve the maximum entrainment ratio. Bezier Curves are used to generate the new wall shapes. The whole shape generation-meshing-simulation-SOGA process is repeated until the ER converges to a maximum value based on the specified convergence criteria for SOGA.
Categories: Electronic dissertations

Thermal System Optimization

Thermal System Optimization

(2005) carried out the modeling and optimization of two-phase ejectors for cooling systems considering NH3 and ... of a novel combined power and ejector refrigeration cycle considering the maximization of exergetic efficiency as the ...

Author: Vivek K. Patel

Publisher: Springer

ISBN: 9783030104771

Category: Science

Page: 477

View: 543

This book presents a wide-ranging review of the latest research and development directions in thermal systems optimization using population-based metaheuristic methods. It helps readers to identify the best methods for their own systems, providing details of mathematical models and algorithms suitable for implementation. To reduce mathematical complexity, the authors focus on optimization of individual components rather than taking on systems as a whole. They employ numerous case studies: heat exchangers; cooling towers; power generators; refrigeration systems; and others. The importance of these subsystems to real-world situations from internal combustion to air-conditioning is made clear. The thermal systems under discussion are analysed using various metaheuristic techniques, with comparative results for different systems. The inclusion of detailed MATLAB® codes in the text will assist readers—researchers, practitioners or students—to assess these techniques for different real-world systems. Thermal System Optimization is a useful tool for thermal design researchers and engineers in academia and industry, wishing to perform thermal system identification with properly optimized parameters. It will be of interest for researchers, practitioners and graduate students with backgrounds in mechanical, chemical and power engineering.
Categories: Science

Advances in Oxygen Research and Application 2013 Edition

Advances in Oxygen Research and Application  2013 Edition

As shown, the refrigeration cycle 110 includes an ejector 112, a separator 114, an internal heat exchanger 116, a compressor 118 ... Thus, the refrigeration cycle 110 requires high power consumption, which is not desirable or efficient.

Author:

Publisher: ScholarlyEditions

ISBN: 9781481671361

Category: Science

Page: 1006

View: 734

Advances in Oxygen Research and Application: 2013 Edition is a ScholarlyBrief™ that delivers timely, authoritative, comprehensive, and specialized information about ZZZAdditional Research in a concise format. The editors have built Advances in Oxygen Research and Application: 2013 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about ZZZAdditional Research in this book to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Advances in Oxygen Research and Application: 2013 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Categories: Science