Download or read book Frosting for Air Source Heat Pumps written by Mengjie Song and published by Elsevier. This book was released on 2024-11-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frosting for Air Source Heat Pumps: Research, Case Studies, and Methods provides a comprehensive accounting of the latest research, analysis, and modeling methods for limiting frosting and maximizing efficiency. The book begins by outlining the fundamentals of frosting mechanisms, including the condensation and freezing of water droplets. It then provides a wide range of case studies that showcase a variety of surfaces, conditions, and energy generation technologies. Finally, the last chapters demonstrate modeling and analysis of frosting operation before laying out critical considerations for designing a frost control strategy in ASHPs.Building on the theory and studies contained in the author's previous work Defrosting for Air Source Heat Pumps, this book provides essential and advanced information for understanding and controlling frosting for these sustainable energy sources. - Outlines the fundamentals of frosting mechanisms in different circumstances and on a variety of surfaces - Provides a wide range of real-world case studies, including demonstrations of analysis and modeling in finned tube heat exchangers and ASHPs - Details a huge collection of experimental and numerical data on reverse cycle defrosting, the most common defrosting methods for ASHPs

Download or read book Performance Tests of Air Source Heat Pumps Under Frosting Conditions written by Per Fahlen and published by . This book was released on 1994 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frosting and Defrosting Behaviour of Outdoor Coils of Air source Heat Pumps written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Defrosting for Air Source Heat Pump written by Mengjie Song and published by Woodhead Publishing. This book was released on 2019-05-16 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: Defrosting for Air Source Heat Pumps: Research, Analysis and Methods presents a detailed analysis of the methods, processes and problems relating to defrosting, a necessary requirement to maintain the performance of ASHP units. Readers will gain a deeper understanding of control strategies and system design optimization methods that improve the performance and reliability of units. The book discusses the most recent experimental and numerical studies of reverse cycle defrosting and the most widely used defrosting method for ASHP. Techno-economic considerations are also presented, as is the outlook for the future. This book is a valuable resource for research students and academics of thermal energy and mechanical engineering, especially those focusing on defrosting for ASHP, heating, ventilation and energy efficiency, as well as engineers and professionals engaged in the development and management of heat pump machinery. - Includes MATLAB codes that allow the reader to implement the knowledge they have acquired in their own simulations and projects - Discusses experimental and numerical studies to provide a well-rounded analysis of technologies, methods and available systems - Presents techno-economic considerations and a look to the future

Download or read book Frosting and Defrosting Behaviour of Outdoor Coils of Air source Heat Pumps written by J. W. J. Bouma and published by . This book was released on 1981 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frosting and Icing for Efficient Energy Use in Engineering Applications written by Long Zhang and published by Elsevier. This book was released on 2025-03-01 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frosting and Icing for Efficient Energy Use in Engineering Applications provides a compendium of innovative case studies for mitigating impacts from frosting and icing on energy. This book first clarifies the mechanisms of frosting and icing, outlining modeling options, and control techniques. Next, a series of experimental examples show the effects of frosting at different scales of energy production, from ambient air vaporizers to wind turbines, and demonstrate how to control these for maximum efficiency. Finally, the mechanisms and mitigation of frosting are examined in a variety of infrastructure scenarios, including sustainable food storage and efficient high-speed railways. Combining the theoretical fundamentals of frosting and icing with a huge range of real-world case studies, this resource shows how to limit energy loss to these effects in key areas of engineering. - Provides essential, foundational knowledge about frosting and icing mechanisms for energy transfer, production, and use - Details practical methods for modeling and control of frosting and icing, including analysis of appropriate use in Energy and transport applications - Includes two collections of case studies, showing how to maximize efficiency through frosting control in sustainable energy production and infrastructure

Download or read book Frosting and Defrosting of Air Coils written by Per Fahlén and published by . This book was released on 1996 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frosting adversely affects the performance of air-coils under adverse conditions. This report surveys the literature in this field with applications such as air-source heat pumps, refrigeration cooling and freezing coils, and heat recovery ventilators. Since the heat and mass transfer characteristics of a coil will significantly influence the process of frosting, many references pertain to the dry and wet heat transfer of finned-tube air-coils. Furthermore, the change in pressure drop and air flow caused by frosting is a major factor in determining the drop in coil capacity. Therefore the survey also lists references to coil pressure drop. The report contains a literature survey part, a technical index and an alphabetical author index. The survey part discusses some of the most important references based, among other things, on the frequency with which they appear in the reference lists of other authors. In the technical index, references are sorted according to their relevance on topics such as heat and mass transfer, frosting, defrosting, defrost control, as well as standards and test methods. Finally, the alphabetical author index simply gives all the references in alphabetical order according to the name of the first author. A total of 738 references are listed. In some cases, however, the references may seem rather peripheral to the subject of frosted coils. This is particularly the case regarding practical experience. Such information is often subordinate to a lot of general operational information regarding refrigeration and heat pump equipment. Nonetheless, such references are worthwhile for the researcher to consider since they provide an important link between the engineering and the research communities.

Download or read book FROSTING AND DEFROSTING BEHAVIOUR OF OUT DOOR COILS OF AIR SOURCE HEAT PUMPS FINAL REPORT FIGURES written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frosting and Defrosting Behaviour of Outdoor Coils of Air source Heat Pumps written by J. W. J. Bouma and published by . This book was released on 1981 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frosting and Defrosting Behaviour of Outdoor Coils of Air source Heat Pumps written by Commission of the European Communities and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Frosting and Defrosting of Air coils written by Per Fahlén and published by . This book was released on 1996 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frosting of air-coils is an important factor in the design and operation of air-source heat pumps, heat recovery ventilators, cooling and refrigeration equipment etc. This report presents results from laboratory testing of two brine-cooled air-coils under frosting conditions. The coils have the same number of plane, continuos fins, 4 tube rows with 12 tubes in each row, tube spacing of 50 mm and fin spacing of 3 and 6 mm respectively. The original purpose of the test program was to compare various possible indicators of coil frosting and to analyze the possible effects of different control strategies on coil capacity and the COP of the system (the analysis will be presented in a separate report). Tests involved inlet air temperatures of -7 and +2 degrees Celsius, variation of humidity between 70 and 100 % RH (including simulated rain), velocities in the range 1 to 4 m/s, and specific cooling loads from 50 to 150 W/m2. Test results include variations due to frosting of e.g. cooling capacity, COP, air flow and pressure drop, fan power, air outlet temperature and humidity, coil temperature, frost mass, and frosting time. Results also include the subsequently required defrost time, defrost energy and collected mass of defrost water. The frosting process was interrupted when the air flow had decreased to 30 % of the original value with a non-frosted coil. The results clearly show the advantage of demand controlled defrosting with variations in frosting time between 2 h with high humidity/high specific cooling load up to, for practical purposes, infinite frosting times with low humidity/low specific cooling load. The accumulated frost mass during one frosting cycle varied from less than 0.02 kg/m2 up to approximately 0.4 kg/m2.

Download or read book Sustainable Development of Urban Environment and Building Material written by Hui Li and published by Trans Tech Publications Ltd. This book was released on 2011-10-24 with total page 2840 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS). These peer-reviewed papers record the invaluable researches of the authors in the fields of innovation in structural system and disaster prevention in engineering structures, architectural innovation, sustainable development of buildings and the environment and innovations in, and applications of, building materials. Hot topics and state-of-the-art view related to sustainable development in civil engineering are presented.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Air source Heat Pump written by V. D. Baxter and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Heat Pumps for Cold Climate Heating written by Hui Huang and published by CRC Press. This book was released on 2020-05-01 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air source heat pumps are mainly used for space heating, and have the advantages of environmental protection, energy saving, and comfort. Written by leading heat pump technology expert Hui Huang, this book summarizes the research and applications of variable volume ratio two-stage vapor compression air source heat pump technology, and its use in cold climate regions. This book can be used for reference by scientific researchers and engineers engaged in research on air source heat pump technology, product development and popularization; and by energy management and policy researchers. It will also be of value to undergraduate and graduate students studying these areas of technology.

Download or read book Proceedings of the 8th International Symposium on Heating Ventilation and Air Conditioning written by Angui Li and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 825 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the 8th International Symposium on Heating, Ventilation and Air Conditioning is based on the 8th International Symposium of the same name (ISHVAC2013), which took place in Xi’an on October 19-21, 2013. The conference series was initiated at Tsinghua University in 1991 and has since become the premier international HVAC conference initiated in China, playing a significant part in the development of HVAC and indoor environmental research and industry around the world. This international conference provided an exclusive opportunity for policy-makers, designers, researchers, engineers and managers to share their experience. Considering the recent attention on building energy consumption and indoor environments, ISHVAC2013 provided a global platform for discussing recent research on and developments in different aspects of HVAC systems and components, with a focus on building energy consumption, energy efficiency and indoor environments. These categories span a broad range of topics, and the proceedings provide readers with a good general overview of recent advances in different aspects of HVAC systems and related research. As such, they offer a unique resource for further research and a valuable source of information for those interested in the subject. The proceedings are intended for researchers, engineers and graduate students in the fields of Heating, Ventilation and Air Conditioning (HVAC), indoor environments, energy systems, and building information and management. Angui Li works at Xi’an University of Architecture and Technology, Yingxin Zhu works at Tsinghua University and Yuguo Li works at The University of Hong Kong.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1985-02 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: