Promising Advances In Desiccant Cooling

This book systematically analyses state-of-the-art technology and research related to desiccant dehumidification. It provides key insights into the current research direction, and presents global research and development interests. It begins by offering a comprehensive review of conventional desiccants and their underlying engineering challenges. Fundamental material characteristic properties and factors critical to the desiccant synthesis are highlighted. The applicability of next-generation advanced materials to address the challenges is documented, and the advantages of desiccant coated heat exchangers are evaluated. Lastly, the potential applications of desiccant dehumidifiers in various energy-connected applications are discussed, and case studies on industrial/building cooling systems are provided. Specifically targeted at HVAC engineers, thermal scientists, energy-engineering researchers, and graduate-level students in the field, the technical content balances fundamental concepts and applications.

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. Charles Nehme

Solar cooling is most effective where it is most needed - in the tropics. Most developing countries lie in the hotter climatic regions, where cooling facilities are essential to promote the well-being, productivity and comfort of the population. Paradoxically, solar air-conditioning can contribute significantly to the alleviation of the problem. This book includes fully detailed treatment of the theory and applications of the techniques involved: vapour absorption systems, solar absorption systems, solar absorption cooling, radiative cooling and desiccant cooling. Particular applications stressed include the use of passive cooling in buildings and the provision of efficient refrigeration facilities, the latter being essential for the storage of vaccines in health-care programmes for the eradication of infectious diseases throughout the developing world.

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.

"Providing guidance to design engineers and contractors, this book illustrates in full detail how operational savings of 50 to 75 percent can be achieved with evaporative cooling technologies compared to equivalent electric-based systems. Thorough in scope, the book addresses the technical aspects of evaporative cooling, as well as a broad range of specific commercial and industrial applications. Topics include cost analysis, technology and equipment options, application guidelines, and operational and performance characteristics. The third edition adds a new chapter which shows how evaporative cooling can be integrated into large-scale HVAC systems, with discussions of achievable savings, maintenance costs, cooling tower and finned coil indirect cooling, wet bulb economizers, precooling condensed air, makeup air and return air, humidity control, and more, including sample calculations as well as demonstration and engineering data."--BOOK JACKET.Title Summary field provided by Blackwell North America, Inc. All Rights Reserved

As the complexity of the food supply system increases, the focus on processes used to convert raw food materials and ingredients into consumer food products becomes more important. The Handbook of Food Engineering, Third Edition, continues to provide students and food engineering professionals with the latest information needed to improve the efficiency of the food supply system. As with the previous editions, this book contains the latest information on the thermophysical properties of foods and kinetic constants needed to estimate changes in key components of foods during manufacturing and distribution. Illustrations are used to demonstrate the applications of the information to process design. Researchers should be able to use the information to pursue new directions in process development and design, and to identify future directions for research on the physical properties of foods and kinetics of changes in the food throughout the supply system. Features Covers basic concepts of transport and storage of liquids and solids, heating and cooling of foods, and food ingredients New chapter covers nanoscale science in food systems Includes chapters on mass transfer in foods and membrane processes for liquid concentration and other applications Discusses specific unit operations on freezing, concentration, dehydration, thermal processing, and extrusion The first four chapters of the Third Edition focus primarily on the properties of foods and food ingredients with a new chapter on nanoscale applications in foods. Each of the eleven chapters that follow has a focus on one of the more traditional unit operations used throughout the food supply system. Major revisions and/or updates have been incorporated into chapters on heating and cooling processes, membrane processes, extrusion processes, and cleaning operations.