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Integration Of A Thermoelectric Subcooler Into A Carbon Dioxide Transcritical Vapor Compression Cycle Refrigeration System
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Book Synopsis Integration of a Thermoelectric Subcooler Into a Carbon Dioxide Transcritical Vapor Compression Cycle Refrigeration System by : Jonathan Michael Schoenfeld
Download or read book Integration of a Thermoelectric Subcooler Into a Carbon Dioxide Transcritical Vapor Compression Cycle Refrigeration System written by Jonathan Michael Schoenfeld and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transcritical CO2 Heat Pump by : Xin-rong Zhang
Download or read book Transcritical CO2 Heat Pump written by Xin-rong Zhang and published by John Wiley & Sons. This book was released on 2021-02-17 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely and comprehensive introduction to CO2 heat pump theory and usage A comprehensive introduction of CO2 application in heat pump, authored by leading scientists in the field CO2 is a hot topic due to concerns over global warming and the 'greenhouse effect'. Its disposal and application has attracted considerable research and governmental interest Explores the basic theories, devices, systems and cycles and real application designs for varying applications, ensuring comprehensive coverage of a current topic CO2 heat transfer has everyday applications including water heaters, air-conditioning systems, residential and commercial heating systems, and cooling systems
Book Synopsis Transcritical CO2 Heat Pump by : Xin-rong Zhang
Download or read book Transcritical CO2 Heat Pump written by Xin-rong Zhang and published by John Wiley & Sons. This book was released on 2021-05-10 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely and comprehensive introduction to CO2 heat pump theory and usage A comprehensive introduction of CO2 application in heat pump, authored by leading scientists in the field CO2 is a hot topic due to concerns over global warming and the 'greenhouse effect'. Its disposal and application has attracted considerable research and governmental interest Explores the basic theories, devices, systems and cycles and real application designs for varying applications, ensuring comprehensive coverage of a current topic CO2 heat transfer has everyday applications including water heaters, air-conditioning systems, residential and commercial heating systems, and cooling systems
Book Synopsis Simulations for Thermodynamic Analyses of Transcritical Carbon Dioxide Refrigeration Cycle and Reheat Dehumidification Air Conditioning Cycle by : Mark Brown
Download or read book Simulations for Thermodynamic Analyses of Transcritical Carbon Dioxide Refrigeration Cycle and Reheat Dehumidification Air Conditioning Cycle written by Mark Brown and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Carbon dioxide is a natural refrigerant that has been considered for certain refrigeration and air conditioning applications. The coefficient of performance (COP) of carbon dioxide cycles is low compared to classical vapor compression cycles. The aim of this portion of the thesis is to present a thermodynamic analysis of carbon dioxide cycles in order to evaluate the potential performance of a refrigeration cycle using carbon dioxide. A thermodynamic model for the cycle is proposed which can simulate the operation of a carbon dioxide refrigeration cycle. This model takes into account the practical effects of the thermo-physical properties of carbon dioxide as a refrigerant in a trans-critical cycle. One and two-stage compression processes were considered for comparison purposes. A sensitivity analysis has been conducted so that cycle performance can be estimated. The effect of cycle components on system capacity and cycle performance was investigated. The second portion of the thesis deals with the concept of reheat air conditioning, and looks at the performance of different reheat cycles. The thesis looks at reheat systems that utilize different placements of the reheat coil. The overall performance ofthese reheat systems is then calculated. These systems require no additional electric power to reheat the air after it is cooled and dehumidified in the evaporator. Instead, theyuse heat from the condenser heat exchanger to reheat the air during partial load conditions. Four different reheat configurations are discussed and analyzed to determine performance levels. Visual Basic programs were written for each of the four cycles to simulate the different configurations and to evaluate key performance parameters. Graphs were developed based on these programs, where critical variables were changed to monitor trends in coefficient of performance. The thermodynamic cycle of each reheat configuration is developed, with equations presented with figures depicting the cycles. Refrigerant 134a was used in the programs throughout the reheat section of the thesis. The reheat coefficient of performance is used as the basis for cycle comparison. The relative performance of the four cycles is illustrated in the figures and explained in the Results and Discussion section at the end of chapter 3.
Book Synopsis Development of a Prototype Thermoelectric Space Cooling System Using Phase Change Material to Improve the Performance by : Dongliang Zhao
Download or read book Development of a Prototype Thermoelectric Space Cooling System Using Phase Change Material to Improve the Performance written by Dongliang Zhao and published by . This book was released on 2014 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thermoelectric cooling system has advantages over conventional vapor compression cooling devices, including compact in size, light in weight, high reliability, no mechanical moving parts, no refrigerant, being powered by direct current, and easily switching between cooling and heating modes. However, it has been long suffering from its relatively high cost and low energy efficiency, which has restricted its usage to niche applications, such as space missions, portable cooling devices, scientific and medical equipment, where coefficient of performance (COP) is not as important as reliability, energy availability, and quiet operation environment. Enhancement of thermoelectric cooling system performance generally relies on two methods: improving thermoelectric material efficiency and through thermoelectric cooling system thermal design. This research has been focused on the latter one. A prototype thermoelectric cooling system integrated with phase change material (PCM) thermal energy storage unit for space cooling has been developed. The PCM thermal storage unit used for cold storage at night, functions as the thermoelectric cooling system's heat sink during daytime's cooling period and provides relatively lower hot side temperature for the thermoelectric cooling system. The experimental test of the prototype system in a reduced-scale chamber has realized an average cooling COP of 0.87, with the maximum value of 1.22. Another comparison test for efficacy of PCM thermal storage unit shows that 35.3% electrical energy has been saved from using PCM for the thermoelectric cooling system. In general, PCM faces difficulty of poor thermal conductivity at both solid and liquid phases. This system implemented a finned inner tube to increase heat transfer during PCM charging (melting) process that directly impacts thermoelectric system's performance. A simulation tool for the entire system has been developed including mathematical models for a single thermoelectric module, for the thermoelectric cooling unit, for the PCM thermal storage unit, and for the outdoor air-water heat exchanger. When modeling PCM thermal storage unit, the enthalpy method has been adopted. Since natural convection has been observed in experiments playing a key effect on heat transfer in PCM, a staged effective thermal conductivity ( k[subscript] e ) concept and modified Rayleigh (Ra ) number formula have been developed to better capture natural convection's variable effects during the PCM charging process. Therefore, a modeling-based design procedure for thermoelectric cooling system integrating with PCM has been proposed. A case study has been completed for a model office room to demonstrate the qualitative and quantitative evaluations to the major system components. Results of this research can be extended to other applications in relevant areas. For instance, the proposed PCM thermal storage unit can be applied to integration with water-cooled conventional air-conditioning devices. Instead of using water cooling, a case study of using the proposed PCM unit for a water-cooled air-conditioner shows a COP increase of more than 25.6%.
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 Subcooling Liquid Refrigerant 12 in a Vapor Compression Refrigeration System with a Liquid-vapor Heat Exchanger by : John Donald Christie
Download or read book Subcooling Liquid Refrigerant 12 in a Vapor Compression Refrigeration System with a Liquid-vapor Heat Exchanger written by John Donald Christie and published by . This book was released on 1959 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bringing Thermoelectricity into Reality by : Patricia Aranguren
Download or read book Bringing Thermoelectricity into Reality written by Patricia Aranguren and published by BoD – Books on Demand. This book was released on 2018-07-11 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The disproportionate use of fossil fuels has turned into a serious environmental issue. Thus, we are encountering one of the biggest challenges of the twenty-first century, satisfying the energy demand with respect to the environment. Thermoelectricity is an emerging technology, which contributes to reducing the impact of the use of traditional technologies, harvesting the waste heat, and eliminating the use of refrigerants. The book Bringing Thermoelectricity into Reality covers the current thermoelectric investigations: the study of novel thermoelectric materials, the development of computational models, the design of proper assemblies, and the optimization of thermal designs, as well as novel thermoelectric generators, coolers, and heating applications. This book looks for the definitive thermoelectric applications applied to everyday life.
Book Synopsis Refrigeration Systems and Applications by : Ibrahim Din¿er
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.
Book Synopsis Advances in Heat Pump-Assisted Drying Technology by : Vasile Minea
Download or read book Advances in Heat Pump-Assisted Drying Technology written by Vasile Minea and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 7: Numerical Modeling of Heat Pump-Assisted Contact Drying -- 8: Advances in Dehumidifier Timber Drying in New Zealand -- Back Cover
Book Synopsis A History of Refrigeration Throughout the World by : Roger Thévenot
Download or read book A History of Refrigeration Throughout the World written by Roger Thévenot and published by . This book was released on 1979 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The evolution, trends, and applications of the mechanical aspects of refrigeration are traced from 1755 to the present day. The information is intended to appeal not only to engineering students and refrigerationists, but to the general reader as well. The history is divided into 4 epochs. The first, before 1875, discusses natural refrigeration, thermometry, the development of the concepts of heat and thermal processes, and the 4 families of refrigerating machines. The second epoch, 1875-1914, covers the industrialization of refrigeration and its first applications to brewing, food preservation, storage and transport, and non-food applications such as air conditioning and cryogenics. The third epoch, between the wars, introduces the compressor, refrigeration in daily life, and further developments in established areas. The final epoch, after 1945, documents the explosion of refrigeration technology, its spread throughout the world, and its thousands of uses, from desalination of sea water tofreeze-dried foodstuffs and medical applications.
Download or read book Thermal Systems written by Ivan CK Tam and published by MDPI. This book was released on 2021-04-07 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: We live in interesting times in which life as we know it is being threatened by manmade changes to the atmosphere in which we live. On the global scale, concern is focused on climate change due to greenhouse gas emissions, and on a national scale, atmospheric pollution produced by combustion processes is of concern. A possible approach is through the development of new ideas and innovative processes to the current practices. Among the available options, multi-generation processes such as the trigeneration cycle, battery storage system, solar power plants and heat pumps have been widely studied, as they potentially allow for greater efficiency, lower costs, and reduced emissions. On the other hand, some researchers had been working to increase the potential of energy generation process through heat recovery under the steam generator, organic Rankine cycle, and absorption chillers. In this Special Issue on "Thermal Systems” of fundamental or applied and numerical or experimental investigation, many new concepts in thermal systems and energy utilization were explored and published as original research papers in this “Special Issue”.
Book Synopsis Automotive Air Conditioning and Climate Control Systems by : Steven Daly
Download or read book Automotive Air Conditioning and Climate Control Systems written by Steven Daly and published by Elsevier. This book was released on 2011-04-18 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Automotive Air-conditioning and Climate Control Systems is a complete text and reference on the theoretical, practical and legislative aspects of vehicle climate control systems for automotive engineering students and service professionals. It provides the reader with a thorough up-to-date knowledge of current A/C systems, refrigerants and the new possible replacement systems like CO2, and includes unrivalled coverage of electronic and electrical control. Filling the gap in the automotive engineering and servicing market for students and those training on the job, this book will help both newcomers and those with more experience of air-conditioning systems maintenance engineering to keep up with the latest developments and legislation. Detailed coverage of European and US vehicle HVAC systems Thorough explanation of current and future systems including CO2 Meets relevant C&G, IMI, and HND vocational and professional qualifications IMI recommended reading material Includes practical cases studies and examples from design and manufacturing companies including Ford, Vauxhall, Toyota, VW, Visteon, Sanden and others, accompanied by over 300 detailed illustrations and photographs
Book Synopsis Proceedings of International Conference on Thermofluids by : Shripad Revankar
Download or read book Proceedings of International Conference on Thermofluids written by Shripad Revankar and published by Springer Nature. This book was released on 2020-11-21 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents selected and peer-reviewed proceedings of the International Conference on Thermofluids (KIIT Thermo 2020). It focuses on the latest studies and findings in the areas of fluid dynamics, heat transfer, thermodynamics, and combustion. Some of the topics covered in the book include electronic cooling, HVAC system analysis, inverse heat transfer, combustion, nano-fluids, multiphase flow, high-speed flow, and shock waves. The book includes both experimental and numerical studies along with a few review chapters from experienced researchers, and is expected to lead to new research in this important area. This book is of interest to students, researchers as well as practitioners working in the areas of fluid dynamics, thermodynamics, and combustion.
Book Synopsis Innovative Design, Analysis and Development Practices in Aerospace and Automotive Engineering (I-DAD 2018) by : U. Chandrasekhar
Download or read book Innovative Design, Analysis and Development Practices in Aerospace and Automotive Engineering (I-DAD 2018) written by U. Chandrasekhar and published by Springer. This book was released on 2018-12-14 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book includes the best articles presented by researchers, academicians and industrial experts at the International Conference on “Innovative Design and Development Practices in Aerospace and Automotive Engineering (I-DAD 2018)”. The book discusses new concept in designs, and analysis and manufacturing technologies for improved performance through specific and/or multi-functional design aspects to optimise the system size, weight-to-strength ratio, fuel efficiency and operational capability. Other aspects of the conference address the ways and means of numerical analysis, simulation and additive manufacturing to accelerate the product development cycles.Describing innovative methods, the book provides valuable reference material for educational and research organizations, as well as industry, wanting to undertake challenging projects of design engineering and product development.
Book Synopsis Advances in Air Conditioning and Refrigeration by : Maddali Ramgopal
Download or read book Advances in Air Conditioning and Refrigeration written by Maddali Ramgopal and published by Springer Nature. This book was released on 2020-10-10 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents selected peer-reviewed papers from the International Conference on Recent Advancements in Air Conditioning and Refrigeration (RAAR) 2019. The focus is on current research in a very topical area of HVAC technology, which has wide-ranging applications. The topics covered include modern air conditioning and refrigeration practices, environment-friendly refrigerants, high-performance components, computer-assisted design, manufacture, operations and data management, energy-efficient buildings, and application of solar energy to heating and air conditioning. This book is useful for researchers and industry professionals working in the field of heating, air conditioning and refrigeration.
Book Synopsis Multiparameter Equations of State by : Roland Span
Download or read book Multiparameter Equations of State written by Roland Span and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: As a basis for printed property charts and tables, empirical multiparameter equa tions of state have been the most important source of accurate thermodynamic property data for more than 30 years now. However, due to increasing demands on the accuracy of thermodynamic property data in computerised calculations as well as the availability of appropriate software tools, and the ever increasing computer power, such formulations are nowadays becoming a valuable tool for everyday work. This development has substantially increased the number of scientists, engi neers, and students who are working with empirical multiparameter equations of state, and it continues to do so. Nevertheless, common knowledge on this kind of thermodynamic property models and on the ongoing progress in this scientific discipline is still very limited. Multiparameter equations of state do not belong to the topics which are taught intensively in thermodynamic courses in engineering and natural sciences and the books and articles where they are published mainly deal with the thermodynamic properties of certain substances rather than with the theoretical background of the used equations of state. In contrast to this, my concern mainly was to give a survey of the theoretical background of multiparameter equations of state both with regard to their application and their development.
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