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Author : Thomas James Hofler
Publisher :
ISBN 13 :
Total Pages : 284 pages
Book Rating : 4.:/5 (15 download)
Download or read book Thermoacoustic Refrigerator Design and Performance written by Thomas James Hofler and published by . This book was released on 1986 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Gregory W. Swift
Publisher : Springer
ISBN 13 : 3319669338
Total Pages : 340 pages
Book Rating : 4.3/5 (196 download)
Download or read book Thermoacoustics written by Gregory W. Swift and published by Springer. This book was released on 2017-10-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This updated new edition provides an introduction to the field of thermoacoustics. All of the key aspects of the topic are introduced, with the goal of helping the reader to acquire both an intuitive understanding and the ability to design hardware, build it, and assess its performance. Weaving together intuition, mathematics, and experimental results, this text equips readers with the tools to bridge the fields of thermodynamics and acoustics. At the same time, it remains firmly grounded in experimental results, basing its discussions on the distillation of a body of experiments spanning several decades and countries. The book begins with detailed treatment of the fundamental physical laws that underlie thermoacoustics. It then goes on to discuss key concepts, including simple oscillations, waves, power, and efficiency. The remaining portions of the book delve into more advanced topics and address practical concerns in applications chapters on hardware and measurements. With its careful progression and end-of-chapter exercises, this book will appeal to graduate students in physics and engineering as well as researchers and practitioners in either acoustics or thermodynamics looking to explore the possibilities of thermoacoustics. This revised and expanded second edition has been updated with an eye to modern technology, including computer animations and DeltaEC examples.
Author : Thomas James Hofler
Publisher :
ISBN 13 :
Total Pages : 324 pages
Book Rating : 4.:/5 (318 download)
Download or read book Thermoacoustic Refrigerator Design and Performance written by Thomas James Hofler and published by . This book was released on 1986 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sadik Kakaç
Publisher : Springer Science & Business Media
ISBN 13 : 9401000999
Total Pages : 489 pages
Book Rating : 4.4/5 (1 download)
Download or read book Low Temperature and Cryogenic Refrigeration written by Sadik Kakaç and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 489 pages. Available in PDF, EPUB and Kindle. Book excerpt: Refrigeration plays a prominent role in our everyday lives, and cryogenics plays a major role in medical science, space technology and the cooling of low-temperature electronics. This volume contains chapters on basic refrigeration systems, non-compression refrigeration and cooling, and topics related to global environmental issues, alternative refrigerants, optimum refrigerant selection, cost-quality optimization of refrigerants, advanced thermodynamics of reverse-cycle machines, applications in medicine, cryogenics, heat pipes, gas-solid absorption refrigeration, multisalt resorption heat pumps, cryocoolers, thermoacoustic refrigeration, cryogenic heat transfer and enhancement and other topics covering theory, design, and applications, such as pulse tube refrigeration, which is the most efficient of all cryocoolers and can be used in space missions.
Author : Torsten Blumreiter
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (32 download)
Download or read book Building of a Thermoacoustic Refrigerator and Measuring the Basic Performance written by Torsten Blumreiter and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas James Hofler
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (64 download)
Download or read book NPS-PH-95-002 written by Thomas James Hofler and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new design for a thermoacoustic heat driven cooler is proposed and has been analyzed via a numerical model. The engine layout incorporates a half wavelength or can be run in a full wavelength with dual prime movers and dual coolers coupled thermally in parallel. Both simplified models and more physically realistic models have been constructed and adjusted for good performance. Simplified models indicate an overall COP of 0.48, which means that the total cooling power is a factor of 0.48 smaller than the total heat input. More detailed and realistic models indicate an overall COP of 0.43. Geometry numbers have been finalized and much of the drafting for an experimental unit has been completed. We hope that high power densities can be achieved with this engine. We also believe that overall COP's in the range of 0.6 to 0.7 may be possible with further improvements. Additionally, we have numerically studied issues of achieving acoustic onset with this engine and the sensitivity of the onset condition to the model parameters. We have also developed a new heat exchanger fabrication method which will allow us to achieve the smallness of geometry scale that was discussed in the previous report. The practical result is better thermal coupling with less acoustic dissipation. The fabrication method is also considerably simpler than our previous method.
Author : Matthew Poese
Publisher :
ISBN 13 :
Total Pages : 111 pages
Book Rating : 4.:/5 (455 download)
Download or read book Performance Measurements on a Thermoacoustic Refrigerator Driven at High Amplitudes written by Matthew Poese and published by . This book was released on 1998 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the power density in a thermoacoustic device is proportional to the square of the acoustic Mach number, there is strong motivation to design thermoacoustic refrigerators to operate at larger pressure amplitudes. Measurements are reported of a modified version of the Space Thermoacoustic Refrigerator (STAR), driven at pressure amplitudes up to 6%. This pressure ratio corresponds to 30 W of cooling power -- five times as large as reported in 1993. The results of these measurements are compared to a DELTAE computer model of the low amplitude (linear) performance that matches experimental conditions on a point-by-point basis. It is found that there is a small but measurable deviation in heat pumping power from the power predicted with a linear acoustic computer model. This deviation in heat pumping power at 6% pressure ratio is about 15%. A large, amplitude independent disagreement in the acoustic power needed to attain a specific pressure ratio is found between measured data and DELTAE results. An overview of the instrumentation, including a measurement of exhaust heat with an absolute accuracy of 65 mW, is also presented.
Author : Torsten Blumreiter
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (32 download)
Download or read book Building of a Thermoacoustic Refrigerator and Measuring the Basic Performance written by Torsten Blumreiter and published by . This book was released on 1994 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (946 download)
Download or read book Performance Measurement of a Mini Thermoacoustic Refrigerator and Associated Drivers written by and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A miniature Thermoacoustic refrigerator is being developed to cool integrated circuits - which must sometimes operate at high temperatures nearing the upper threshold of their tolerance - to temperature spans more within the circuits1 tolerable limits, without the need of the chemicals of a traditional refrigerating system. The development of an electrically powered acoustic driver that powers the thermoacoustic refrigerator is described, as well as different schemes to improve its delivered acoustic power. The driver utilizes a flexural tri- laminar piezoelectric disk to generate one to two Watts of acoustic power at 4 kHz in 15 bar of He-Kr gas mixture. Two different drivers are tested on a pressurized test resonator, and their quantitative performance is analyzed. The analysis of the drivers performance indicates one power-improvement scheme may be faulty, while data taken before the second broke indicates its design may be beneficial to power-improvement. Tests are also conducted using a refrigerating resonator; these first attempts to meet design criteria of temperature span and cooling power are unsuccessful, but the results obtained - including a thermodynamic coefficient of performance (COP) 13.1% below the modeled ideal value for the given data set - with less- than- ideal acoustic power delivered to the resonator signal suggest continued research is worthwhile.
Author : Sadhan Kumar Ghosh
Publisher : Springer Nature
ISBN 13 : 9811623473
Total Pages : 404 pages
Book Rating : 4.8/5 (116 download)
Download or read book Advances in Thermal Engineering, Manufacturing, and Production Management written by Sadhan Kumar Ghosh and published by Springer Nature. This book was released on 2021-07-01 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the selected peer-reviewed proceedings of the International Conference on Thermal Engineering and Management Advances (ICTEMA 2020). The contents discuss latest research in the areas of thermal engineering, manufacturing engineering, and production management. Some of the topics covered include multiphase fluid flow, turbulent flows, reactive flows, atmospheric flows, combustion and propulsion, computational methods for thermo-fluid arena, micro and nanofluidics, renewable energy and environment sustainability, non-conventional energy resources, energy principles and management, machine dynamics and manufacturing, casting and forming, green manufacturing, production planning and management, quality control and management, and traditional and non-traditional manufacturing. The contents of this book will be useful for students, researchers as well as professionals working in the area of mechanical engineering and allied fields.
Author : Masoud Akhavanbazaz
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)
Download or read book Design, Analysis, Testing and Development of a Thermoacoustic System for Refrigeration Applications written by Masoud Akhavanbazaz and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The numerical study has shown that the stack length and the position of the stack in the resonator have a significant impact on the overall performance of the thermoacoustic device. Air at standard temperature and pressure is employed as the working gas. The acoustic power source was a 15 W speaker operating at a frequency of 450 Hz. Based on a numerical study, the stack length was set equal to 3 cm with its center located at a distance of 5 cm from the driver-end of a 38.5 cm long resonator tube. The temperature difference between the two ends of the stack was set equal to 25 K.A thermoacoustic refrigerator was developed based on the designed parameters. Preliminary experimental results have shown that a temperature difference of as high as 23 K was established across the stack. In order to exploit the thermoacoustic effect for heat pumping; heat exchangers were attached at both ends of stack. Water at ambient temperature was chosen as the working fluid for the heat exchangers to facilitate heat transfer to or from the stack. A pump was used to circulate water through both heat exchangers. Experimental results have shown that water temperature difference of 3 K for cold heat exchanger and 7.5 K for hot heat exchanger were established. The maximum coefficient of performance (COP) of this device was 1.5. Further research and development is needed in order to explore the full potential of the device in refrigeration applications. (Abstract shortened by UMI.).
Author : Seyhmus Direk
Publisher :
ISBN 13 : 9781423529798
Total Pages : 102 pages
Book Rating : 4.5/5 (297 download)
Download or read book Design of a Mini Thermo-Acoustic Refrigerator written by Seyhmus Direk and published by . This book was released on 2001-03 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: A miniature thermoacoustic refrigerator is being developed for the purpose of cooling integrated circuits below their failure temperature when used in hot environments. The development of an electrically powered acoustic driver that powers the thermoacoustic refrigerator is described. The driver utilizes a flexural tri-laminar piezoelectric disk to generate one to two Watts of acoustic power at 4 kHz in 15 bar of He-Kr gas mixture. This thesis is the second of two driver development theses, which includes the information on the assembly of three drivers and their quantitative performance with a pressurized test resonator. A maximum acoustic power output of 0.5 Watt was achieved with the third driver.
Author : Ibrahim Din¿er
Publisher : John Wiley & Sons
ISBN 13 : 1119230780
Total Pages : 990 pages
Book Rating : 4.1/5 (192 download)
Download or read book Refrigeration Systems and Applications written by Ibrahim Din¿er and published by John Wiley & Sons. This book was released on 2017-03-23 with total page 990 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Dion Savio Antao
Publisher :
ISBN 13 :
Total Pages : 580 pages
Book Rating : 4.:/5 (854 download)
Download or read book Effects of Acoustic and Fluid Dynamic Interactions in Resonators written by Dion Savio Antao and published by . This book was released on 2013 with total page 580 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermoacoustic refrigeration systems have gained increased importance in cryogenic cooling technologies and improvements are needed to increase the efficiency and effectiveness of the current cryogenic refrigeration devices. These improvements in performance require a re-examination of the fundamental acoustic and fluid dynamic interactions in the acoustic resonators that comprise a thermoacoustic refrigerator. A comprehensive research program of the pulse tube thermoacoustic refrigerator (PTR) and arbitrarily shaped, circular cross-section acoustic resonators was undertaken to develop robust computational models to design and predict the transport processes in these systems. This effort was divided into three main focus areas: (a) studying the acoustic and fluid dynamic interactions in consonant and dissonant acoustic resonators, (b) experimentally investigating thermoacoustic refrigeration systems attaining cryogenic levels and (c) computationally studying the transport processes and energy conversion through fluid-solid interactions in thermoacoustic pulse tube refrigeration devices.To investigate acoustic-fluid dynamic interactions in resonators, a high fidelity computational fluid dynamic model was developed and used to simulate the flow, pressure and temperature fields generated in consonant cylindrical and dissonant conical resonators. Excitation of the acoustic resonators produced high-amplitude standing waves in the conical resonator. The generated peak acoustic overpressures exceeded the initial undisturbed pressure by two to three times. The harmonic response in the conical resonator system was observed to be dependent on the piston amplitude. The resultant strong acoustic streaming structures in the cone resonator highlighted its potential over a cylindrical resonator as an efficient mixer.Two pulse tube cryogenic refrigeration (PTR) devices driven by a linear motor (a pressure wave generator) were designed, fabricated and tested. The characterization of the systems over a wide range of operating conditions helped to better understand the factors that govern and affect the performance of the PTR. The operating frequency of the linear motor driving the PTR affected the systems' performance the most. Other parameters that resulted in performance variations were the mean operating pressure, the pressure amplitude output from the linear motor, and the geometry of the inertance tube. The effect of the inertance tube's geometry was controlled by a single parameter labeled the "inertance". External/ambient conditions affected the performance of the cryocoolers too. To prevent the influence of the ambient conditions on the performance, a vacuum chamber was fabricated to isolate the low temperature regions of the PTR from the variable ambient atmosphere. The experiments provided important information and guidelines for the simulation studies of the PTR that were carried out concurrently.A time-dependent high fidelity computational fluid dynamic model of the entire PTR system was developed to gain a better understanding of internal interactions between the refrigerant fluid and the porous heat-exchangers in its various components and to facilitate better design of PTR systems based on the knowledge gained. The compressible forms of the conservation of mass, momentum and energy equations are solved in the gas and porous media (appropriate estimation of fluid dynamics in heat-exchangers) regions. The heat transfer in the porous regions is governed by a thermal non-equilibrium heat transfer model that calculates a separate gas and solid temperature and accounts for heat transfer between the two. The numerical model was validated using both temporal and quasi-steady state results obtained from the experimental studies. The validated model was applied to study the effects of different operating parameters (frequency, pressure and geometry of the components) on the PTR's performance. The simulations revealed interesting steady-periodic flow patterns that develop in the pulse tube due to the fluctuations caused by the piston and the presence of the inertance tube. Similar to the experiments, the simulations provided important information that help guide the design of efficient PTR systems.
Author : Matthew E. Poese
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (718 download)
Download or read book An Evolution of Compact Thermoacoustic Refrigerator Design written by Matthew E. Poese and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : S. N. SAPALI
Publisher : PHI Learning Pvt. Ltd.
ISBN 13 : 8120348729
Total Pages : 593 pages
Book Rating : 4.1/5 (23 download)
Download or read book REFRIGERATION AND AIR CONDITIONING written by S. N. SAPALI and published by PHI Learning Pvt. Ltd.. This book was released on 2013-11-13 with total page 593 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is designed for a first course in Refrigeration and Air Conditioning. The subject matter has been developed in a logical and coherent manner with neat illustrations and a fairly large number of solved examples and unsolved problems. The text, developed from the author’s teaching experience of many years, is suitable for the senior-level undergraduate and first-year postgraduate students of mechanical engineering, automobile engineering as well as chemical engineering. The text commences with an introduction to the fundamentals of thermo-dynamics and a brief treatment of the various methods of refrigeration. Then follows the detailed discussion and analysis of air refrigeration systems, vapour compression and vapour absorption refrigeration systems with special emphasis on developing sound physical concepts and gaining problem solving skills. Refrigerants are exhaustively dealt with in a separate chapter. The remainder chapters of the book deal with psychrometry and various processes required for the analysis of air conditioning systems. Technical descriptions of compressors, evaporators, condensers, expansion devices and ducts are provided along with design practices for cooling and heating load calculations. The basic principles of cryogenic systems and applications of cryogenic gases and air liquefaction systems have also been dealt with. The Second Edition incorporates: (a) New sections on vortex tube, solar refrigeration and magnetic refrigeration, in Chapter 2. (b) Additional solved examples on vapour compression refrigeration system using the R134a refrigerant, in Chapter 4. (c) New sections on duct arrangement systems and air distribution systems, in Chapter 15. (d) A new Chapter 17 on Food Preservation.
Author : Michael Paul Susalla
Publisher :
ISBN 13 :
Total Pages : 163 pages
Book Rating : 4.:/5 (818 download)
Download or read book Thermodynamic Improvements for the Space Thermoacoustic Refrigerator (STAR). written by Michael Paul Susalla and published by . This book was released on 1988 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the STAR project is to test and space qualify a new continuous cycle cryogenic refrigeration system for cooling of sensors and electronics which is based upon the newly discovered thermoacoustic heat pumping effect. The new refrigerator has no sliding seals, a cycle frequency of about 300 Hz, and uses acoustic resonance to enhance the overall power density and efficiency. This thesis is concerned specifically with the design and testing of the thermodynamic element (or stack), which is responsible for the thermo- acoustic power conversion, and the testing of binary inert gas mixtures as working fluids. Using the refrigerator's coefficient of performance relative to the ideal Carnot coefficient of performance as a measure of efficiency, we have achieved a 93% improvement over previous designs. Keywords: Thermoacoustic refrigerator, Theses.
