Evaluation of Heat Rejection Strategies for Liquid Desiccant Air-conditioning Systems

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ISBN 13 :
Total Pages : 282 pages
Book Rating : 4.:/5 (927 download)

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Book Synopsis Evaluation of Heat Rejection Strategies for Liquid Desiccant Air-conditioning Systems by :

Download or read book Evaluation of Heat Rejection Strategies for Liquid Desiccant Air-conditioning Systems written by and published by . This book was released on 2015 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increased demand for space cooling and the resulting summer peak in electrical demands are motivating research into thermally-driven air-conditioning systems that can use renewable or waste heat. One promising technology is the use of a Liquid Desiccant Air-Conditioning (LDAC). An evaporative cooling tower (ECT) was used as a cooling device to reject the heat from a LDAC at Queen's University. Investigation of the ECT showed significant power consumption and ineffective operation in humid conditions which contributed to the low electrical and thermal coefficients of performance (COPE and COPT). Therefore, the present study was undertaken to identify and evaluate alternative heat rejection strategies that can provide a better thermal and electrical system performance. The relationship between the relative humidity and the ambient air temperature at a variety of cooling water temperatures was modelled using TRNSYS, a transient simulation program, as the first stage of the study. To find the most promising heat rejection technologies, available cooling methods were reviewed and two were selected (based on the results of the first phase of the study), namely, (i) a cooling water storage (CWS) system and (ii) a ground-source heat exchanger (GSHX) system. These were simulated and evaluated in detail. Finally, an experimental investigation of a stratified cooling water storage tank (SCWS) and night cooling water storage (NCWS) was undertaken to confirm the results of an additional simulation on the use of a stratified cooling tank. From the simulation results and the overall comparison of the selected heat rejection strategies of the LDAC, it was concluded that GSHX system with 25 boreholes showed better COPE than the CWS system whereas the COPT improvement of both systems was almost same. The improved performance of the GSHX however, is expensive as the capital cost for boreholes is higher than the other systems. When comparing the CWS system (with mixed tank) and the SCWS (with stratified tank) it was observed that the stratified tank had the better potential of improving the COPT, depending upon the water flow rate and initial tank temperature.

Desiccant-Assisted Cooling

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Publisher : Springer Science & Business Media
ISBN 13 : 1447155653
Total Pages : 281 pages
Book Rating : 4.4/5 (471 download)

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Book Synopsis Desiccant-Assisted Cooling by : Carlos Eduardo Leme Nóbrega

Download or read book Desiccant-Assisted Cooling written by Carlos Eduardo Leme Nóbrega and published by Springer Science & Business Media. This book was released on 2013-11-19 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increasing concern with indoor air quality has led to air-quality standards with increased ventilation rates. Although increasing the volume flow rate of outside air is advisable from the perspective of air-quality, it is detrimental to energy consumption, since the outside air has to be brought to the comfort condition before it is insufflated to the conditioned ambient. Moreover, the humidity load carried within outside air has challenging HVAC engineers to design cooling units which are able to satisfactorily handle both sensible and latent contributions to the thermal load. This constitutes a favorable scenario for the use of solid desiccants to assist the cooling units. In fact, desiccant wheels have been increasingly applied by HVAC designers, allowing distinct processes for the air cooling and dehumidification. In fact, the ability of solid desiccants in moisture removal is effective enough to allow the use of evaporative coolers, in opposition to the traditional vapor-compression cycle, resulting in an ecologically sound system which uses only water as the refrigerant. Desiccant Assisted Cooling: Fundamentals and Applications presents different approaches to the mathematical modeling and simulation of desiccant wheels, as well as applications in thermal comfort and humidity controlled environments. Experts in the field discuss topics from enthalpy, lumped models for heat and mass transfer, and desiccant assisted radiant cooling systems, among others. Aimed at air-conditioning engineers and thermal engineering researchers, this book can also be used by graduate level students and lecturers in the field.

Desiccant Cooling Systems

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Author :
Publisher : Charles Nehme
ISBN 13 :
Total Pages : 45 pages
Book Rating : 4./5 ( download)

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Book Synopsis Desiccant Cooling Systems by :

Download or read book Desiccant Cooling Systems written by and published by Charles Nehme. This book was released on with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ever-increasing demand for efficient, sustainable, and environmentally friendly cooling solutions has led to significant advancements in the field of HVAC technology. Among these innovations, desiccant cooling systems have emerged as a promising alternative to traditional air conditioning methods. By harnessing the principles of moisture absorption and evaporation, desiccant cooling systems offer precise control over indoor environments, reduced energy consumption, and minimized environmental impact. This comprehensive guide aims to explore the intricacies of desiccant cooling systems, providing readers with a deep understanding of the fundamental principles, diverse applications, challenges faced, and future trends in this field. Through detailed chapters, we delve into the psychrometric processes, types of desiccants, system components, configurations, performance evaluation, real-world applications, and the innovative solutions that shape the landscape of desiccant cooling technology. As the world grapples with the challenges of climate change and the imperative to reduce greenhouse gas emissions, the significance of sustainable cooling technologies cannot be overstated. Desiccant cooling systems stand at the forefront of this movement, offering a path toward energy efficiency, environmental responsibility, and enhanced indoor comfort. We invite readers, ranging from HVAC professionals and engineers to researchers and environmentally conscious individuals, to embark on this journey through the realms of desiccant cooling. By embracing the knowledge presented within these pages, we can collectively contribute to a greener and more sustainable future.

Temperature and Humidity Independent Control (THIC) of Air-conditioning System

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Publisher : Springer Science & Business Media
ISBN 13 : 3642422225
Total Pages : 363 pages
Book Rating : 4.6/5 (424 download)

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Book Synopsis Temperature and Humidity Independent Control (THIC) of Air-conditioning System by : Xiaohua Liu

Download or read book Temperature and Humidity Independent Control (THIC) of Air-conditioning System written by Xiaohua Liu and published by Springer Science & Business Media. This book was released on 2014-01-16 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Temperature and Humidity Independent Control (THIC) of Air-conditioning System focuses on temperature and humidity independent control (THIC) systems, which represents a new concept and new approach for indoor environmental control. This book presents the main components of the THIC systems, including dehumidification devices, high-temperature cooling devices and indoor terminal devices. Other relevant issues, such as operation and control strategy and case studies, are also included. This book is intended for air-conditioning system designers and engineers as well as researchers working with indoor environments. Xiaohua Liu is an associate professor at the Building Energy Research Center, Tsinghua University, China. Yi Jiang is a member of the Chinese Academy of Engineering, the director of the Building Energy Research Center, Tsinghua University, China and the director of the China-USA Joint Research Center on Clean Energy. Tao Zhang is a Ph.D. candidate at the Building Energy Research Center, Tsinghua University, China.

Desiccant Enhanced Evaporative Air-conditioning (DEVap)

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Publisher :
ISBN 13 :
Total Pages : 60 pages
Book Rating : 4.:/5 (698 download)

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Book Synopsis Desiccant Enhanced Evaporative Air-conditioning (DEVap) by :

Download or read book Desiccant Enhanced Evaporative Air-conditioning (DEVap) written by and published by . This book was released on 2011 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: NREL has developed the novel concept of a desiccant enhanced evaporative air conditioner (DEVap) with the objective of combining the benefits of liquid desiccant and evaporative cooling technologies into an innovative "cooling core." Liquid desiccant technologies have extraordinary dehumidification potential, but require an efficient cooling sink. DEVap's thermodynamic potential overcomes many shortcomings of standard refrigeration-based direct expansion cooling. DEVap decouples cooling and dehumidification performance, which results in independent temperature and humidity control. The energy input is largely switched away from electricity to low-grade thermal energy that can be sourced from fuels such as natural gas, waste heat, solar, or biofuels.

Five-year Research Plan for the Solar Desiccant Cooling Program

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Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Five-year Research Plan for the Solar Desiccant Cooling Program by : Dennis Schlepp

Download or read book Five-year Research Plan for the Solar Desiccant Cooling Program written by Dennis Schlepp and published by . This book was released on 1984 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Low-Flow Liquid Desiccant Air-Conditioning: Demonstrated Performance and Cost Implications

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Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)

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Book Synopsis Low-Flow Liquid Desiccant Air-Conditioning: Demonstrated Performance and Cost Implications by :

Download or read book Low-Flow Liquid Desiccant Air-Conditioning: Demonstrated Performance and Cost Implications written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cooling loads must be dramatically reduced when designing net-zero energy buildings or other highly efficient facilities. Advances in this area have focused primarily on reducing a building's sensible cooling loads by improving the envelope, integrating properly sized daylighting systems, adding exterior solar shading devices, and reducing internal heat gains. As sensible loads decrease,however, latent loads remain relatively constant, and thus become a greater fraction of the overall cooling requirement in highly efficient building designs, particularly in humid climates. This shift toward latent cooling is a challenge for heating, ventilation, and air-conditioning (HVAC) systems. Traditional systems typically dehumidify by first overcooling air below the dew-pointtemperature and then reheating it to an appropriate supply temperature, which requires an excessive amount of energy. Another dehumidification strategy incorporates solid desiccant rotors that remove water from air more efficiently; however, these systems are large and increase fan energy consumption due to the increased airside pressure drop of solid desiccant rotors. A third dehumidificationstrategy involves high flow liquid desiccant systems. These systems require a high maintenance separator to protect the air distribution system from corrosive desiccant droplet carryover and so are more commonly used in industrial applications and rarely in commercial buildings. Both solid desiccant systems and most high-flow liquid desiccant systems (if not internally cooled) add sensibleenergy which must later be removed to the air stream during dehumidification, through the release of sensible heat during the sorption process.

Analysis of the Seasonal Performance of Hybrid Liquid Desiccant Cooling Systems

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ISBN 13 :
Total Pages : 314 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Analysis of the Seasonal Performance of Hybrid Liquid Desiccant Cooling Systems by : Friedrich Sick

Download or read book Analysis of the Seasonal Performance of Hybrid Liquid Desiccant Cooling Systems written by Friedrich Sick and published by . This book was released on 1986 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Energy Research Abstracts

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ISBN 13 :
Total Pages : 1364 pages
Book Rating : 4.U/5 (183 download)

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Book Synopsis Energy Research Abstracts by :

Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 1364 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Advances in Solar Heating and Cooling

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Publisher : Woodhead Publishing
ISBN 13 : 0081003021
Total Pages : 598 pages
Book Rating : 4.0/5 (81 download)

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Book Synopsis Advances in Solar Heating and Cooling by : Ruzhu Wang

Download or read book Advances in Solar Heating and Cooling written by Ruzhu Wang and published by Woodhead Publishing. This book was released on 2016-05-25 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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

Analysis of Hybrid Liquid Desiccant Cooling Systems

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Publisher :
ISBN 13 :
Total Pages : 402 pages
Book Rating : 4.:/5 (89 download)

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Book Synopsis Analysis of Hybrid Liquid Desiccant Cooling Systems by : Thomas Karl Buschulte

Download or read book Analysis of Hybrid Liquid Desiccant Cooling Systems written by Thomas Karl Buschulte and published by . This book was released on 1984 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Design and Development of a Novel Liquid Desiccant Air-conditioning System

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Publisher :
ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (122 download)

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Book Synopsis Design and Development of a Novel Liquid Desiccant Air-conditioning System by : Ross Anthony Bonner

Download or read book Design and Development of a Novel Liquid Desiccant Air-conditioning System written by Ross Anthony Bonner and published by . This book was released on 2020 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Direct Evaporative Closed Air Loop (DECAL) system is a novel high efficiency liquid desiccant air-conditioning (LDAC) system which runs primarily on thermal energy rather than electricity. It is designed for residential cooling in hot and humid climates where demand is growing rapidly and incumbent direct-expansion system performance is poor. Unlike other LDAC systems, DECAL is modular. This allows the indoor hardware to remain small and non-intrusive, and offers increased flexibility to install the system in existing building stock without costly changes to the structure. This work lays out the basic operating cycle of the DECAL system and shows its thermodynamic merits in terms of ideal system performance against other LDAC systems. Design studies show DECAL offers improved thermal efficiency, especially in humid climates. The ideal thermal coefficient of performance (COP[subscript th]) is 1.24 at the design point ambient condition of 35C, 60% RH. A mathematical model is built to better characterize performance and optimize the system design. With transport inefficiencies included, the optimal system electrical and thermal COP (COP[subscript e] and COP[subscript th]) are 46.3 and 0.759 respectively for a LiCl system at the design point. These results show the DECAL system could reduce electrical consumption by over 85% from present day best-in-class systems using low-grade thermal energy. A benchtop scaled test of the closed air loop is constructed to validate the model. Experimental test results agree well with the model predictions for evaporative cooling effectiveness and sensible heat exchange, as well as pressure drop. The drying effect of the LAMEE is lower than anticipated. This is likely due to crystallization of liquid desiccant in the pores of the membrane, resulting in a high vapor diffusion resistance. Adjusting for this effect, full system test measurements match the system model well. The benchtop rig testing verified that the closed air loop is capable of generating a sensible cooling effect, but further testing is required to demonstrate modelled figures of merit are achievable.

Polygeneration Systems

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Publisher : Academic Press
ISBN 13 : 0128206268
Total Pages : 453 pages
Book Rating : 4.1/5 (282 download)

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Book Synopsis Polygeneration Systems by : Francesco Calise

Download or read book Polygeneration Systems written by Francesco Calise and published by Academic Press. This book was released on 2021-09-22 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: The support for polygeneration lies in the possibility of integrating different technologies into a single energy system, to maximize the utilization of both fossil and renewable fuels. A system that delivers multiple forms of energy to users, maximizing the overall efficiency makes polygeneration an emerging and viable option for energy consuming industries. Polygeneration Systems: Design, Processes and Technologies provides simple and advanced calculation techniques to evaluate energy, environmental and economic performance of polygeneration systems under analysis. With specific design guidelines for each type of polygeneration system and experimental performance data, referred both to single components and overall systems, this title covers all aspects of polygeneration from design to operation, optimization and practical implementation. Giving different aspects of both fossil and non-fossil fuel based polygeneration and the wider area of polygeneration processes, this book helps readers learn general principles to specific system design and development through analysis of case studies, examples, simulation characteristics and thermodynamic and economic data. Detailed economic data for technology to assist developing feasibility studies regarding the possible application of polygeneration technologies Offers a comprehensive list of all current numerical and experimental results of polygeneration available Includes simulation models, cost figures, demonstration projects and test standards for designers and researchers to validate their own models and/or to test the reliability of their results

Solar Heating and Cooling Systems

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Publisher : Academic Press
ISBN 13 : 0128116633
Total Pages : 442 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Solar Heating and Cooling Systems by : Ioan Sarbu

Download or read book Solar Heating and Cooling Systems written by Ioan Sarbu and published by Academic Press. This book was released on 2016-10-18 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar Heating and Cooling Systems: Fundamentals, Experiments and Applications provides comprehensive coverage of this modern energy issue from both a scientific and technical level that is based on original research and the synthesis of consistent bibliographic material that meets the increasing need for modernization and greater energy efficiency to significantly reduce CO2 emissions. Ioan Sarbu and Calin Sebarchievici present a comprehensive overview of all major solar energy technologies, along with the fundamentals, experiments, and applications of solar heating and cooling systems. Technical, economic, and energy saving aspects related to design, modeling, and operation of these systems are also explored. This reference includes physical and mathematical concepts developed to make this publication a self-contained and up-to-date source of information for engineers, researchers, and professionals who are interested in the use of solar energy as an alternative energy source. Includes learning aims, chapter summaries, problems and solutions to support the theories presented Puts a specific emphasis on the practical application of the technologies in heating and cooling systems Contains calculating equations for the energy and economic index of solar systems

Desiccant Enhanced Evaporative Air-Conditioning (Devap)

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Publisher :
ISBN 13 : 9781298042255
Total Pages : 74 pages
Book Rating : 4.0/5 (422 download)

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Book Synopsis Desiccant Enhanced Evaporative Air-Conditioning (Devap) by : National Renewable Energy Laboratory (Nr

Download or read book Desiccant Enhanced Evaporative Air-Conditioning (Devap) written by National Renewable Energy Laboratory (Nr and published by . This book was released on 2015-02-15 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Proceedings of the ... Intersociety Energy Conversion Engineering Conference

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Publisher :
ISBN 13 :
Total Pages : 900 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Proceedings of the ... Intersociety Energy Conversion Engineering Conference by :

Download or read book Proceedings of the ... Intersociety Energy Conversion Engineering Conference written by and published by . This book was released on 1986 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Analysis of a Counterflow Indirect Evaporative Cooling and Liquid Desiccant Dehumidification System

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ISBN 13 :
Total Pages : 514 pages
Book Rating : 4.:/5 (176 download)

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Book Synopsis Analysis of a Counterflow Indirect Evaporative Cooling and Liquid Desiccant Dehumidification System by : Mohammad Rifat Ullah

Download or read book Analysis of a Counterflow Indirect Evaporative Cooling and Liquid Desiccant Dehumidification System written by Mohammad Rifat Ullah and published by . This book was released on 1986 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: