Download or read book Design of a Solar assisted Liquid Desiccant based evaporative Cooler written by Zaeem Ahmer and published by GRIN Verlag. This book was released on 2018-02-26 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Academic Paper from the year 2017 in the subject Engineering - Power Engineering, Eastern Mediterranean University, language: English, abstract: The increase of occupant comfort demands are leading to rising requirement for air conditioning, but deteriorating global energy and environment crisis are starving for energy saving and environmental protection. The need to come up with the new energy saving as well as environmental friendly air conditioning systems has been more urgent than ever before. In hot and humid areas, the liquid desiccant air-conditioning systems based on evaporative cooling was proposed as a promising invention. This system overcomes the difficulty of evaporative cooler increased humidity with cooling, which makes it unsuitable for hot and humid climates, by dehumidifying the air first and then cooling it inside an evaporative cooler with water. The heating effect of dehumidification process is compensated by cooling water circulation. The use of dehumidifier in conjunction with an evaporative cooler increases the efficiency of the system. Some of the advantages of using this system are: it can remove the air latent load, environmental friendly, removes the pollutants from the process air and reduces the amount of the electrical energy consumed. The primary objective of this project is to design a solar based liquid desiccant evaporative system to purify and supply cool air. Liquid desiccant dehumidification has been proven to be an effective method to extract the moisture of air with relatively less energy consumption, especially compared with conventional vapor compression system. Inside the dehumidifier we used calcium chloride solution which after some period of time gets diluted with water and loses its moisture absorbing capacity and therefore, needs to be heated in the solar collector to ensure that the liquid desiccant does not lose its absorption capacity. In this project, several different aspects in solar assisted liquid desiccant based evaporative cooler have been considered. Some of these aspects include the availability of the materials, manufacturability of the product, sustainability of the product, health and safety regulations and the environmental effects of the product.

Download or read book Feasibility of a Solar Panel powered Liquid Desiccant Cooling System for Greenhouses written by Georgios Lychnos and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To investigate the technical feasibility of a novel cooling system for commercial greenhouses, knowledge of the state of the art in greenhouse cooling is required. An extensive literature review was carried out that highlighted the physical processes of greenhouse cooling and showed the limitations of the conventional technology. The proposed cooling system utilises liquid desiccant technology; hence knowledge of liquid desiccant cooling is also a prerequisite before designing such a system. Extensive literature reviews on solar liquid desiccant regenerators and desiccators, which are essential parts of liquid desiccant cooling systems, were carried out to identify their advantages and disadvantages. In response to the findings, a regenerator and a desiccator were designed and constructed in lab. An important factor of liquid desiccant cooling is the choice of liquid desiccant itself. The hygroscopicity of the liquid desiccant affects the performance of the system. Bitterns, which are magnesium-rich brines derived from seawater, are proposed as an alternative liquid desiccant for cooling greenhouses. A thorough experimental and theoretical study was carried out in order to determine the properties of concentrated bitterns. It was concluded that their properties resemble pure magnesium chloride solutions. Therefore, magnesium chloride solution was used in laboratory experiments to assess the performance of the regenerator and the desiccator. To predict the whole system performance, the physical processes of heat and mass transfer were modelled using gPROMS' advanced process modelling software. The model was validated against the experimental results. Consequently it was used to model a commercials-scale greenhouse in several hot coastal areas in the tropics and sub-tropics. These case studies show that the system, when compared to evaporative cooling, achieves 3°C-5.6°C temperature drop inside the greenhouse in hot and humid places (RH>70%) and 2°C-4°C temperature drop in hot and dry places (50%

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.

Download or read book Simulation based Design Methodology for a Solar Assisted Solid Desiccant Cooling System in Hot and Humid Climates written by Aditya Nibandhe and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar assisted Solid Desiccant Cooling (SDC) systems are effective solutions for hot and humid climates. Unlike conventional cooling systems that cool and dehumidify simultaneously, SDC systems handle sensible and latent load separately, assuring more accessible, economical and efficient air conditioning. Air-based flat-plate Photovoltaic Thermal (PV/T) collectors can provide low grade thermal energy for SDC operation. However, PV/T collectors optimized for increasing the outlet air temperature adversely affect the electrical performance and material integrity of the photovoltaic (PV) modules. As a result, an auxiliary heater (AH) is commonly employed to boost the outlet air temperature to the required level to support the SDC system's operation; increasing the input power requirements of the integrated system. This research investigates a Photovoltaic Thermal Solar Air Heater (PVT SAH) assisted Solid Desiccant Cooling (SDC) system for daytime operation in hot and humid climates. The objective of the research is to develop an integrated design methodology for the complex system. An integrated energy model of a roof mounted PVT-SAH assisted SDC system for an archetypical low-rise mixed-use building in India is developed. First, three configurations of the integrated system are compared and an appropriate configuration is identified. A sensitivity analysis is conducted to investigate the correlation between the design parameters and the objective functions, and specify the ranges of inputs for the optimization study. A multi-objective optimization study is conducted to investigate the design solutions that reduce the solar assisted SDC system's reliance on auxiliary heater, and optimize the solar energy gains (electrical and thermal) for space cooling application. The integrated system configuration with proposed modifications achieved upto 135% improvement in COPth and upto 48% reduction in unmet hours over the typical system configurations. As per the sensitivity analysis, the collector area, air mass flow rate, and channel height are the most important design parameters. The optimization study results show that AH energy consumption is more sensitive to the air mass flow rate for larger collector areas. In contrast, the PV electrical energy gain is more sensitive to the collector areas. The integrated PVT-SAH assisted SDC system shows a great potential to reduce both energy consumption and peak demand. The design methodology proposed in this study will facilitate the design and application of an integrated PVT-SAH assisted SDC system in hot and humid climates.

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

Download or read book Solar Cooling Technologies written by Sotirios Karellas and published by CRC Press. This book was released on 2018-10-03 with total page 449 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solar Cooling Technologies presents a detailed study of the potential technologies for coupling solar energy and cooling systems. Unifies all the various power based solar techniques into one book, investigates tri-generation schemes for maximization of cooling efficiency, especially for small scale applications and offers direct comparison of all possible technologies of solar cooling Includes detailed numerical investigations for potential cooling applications

Download or read book Design and performance testing of a solar powered solid desiccant dehumidification evaporative cooling system written by Michael Neal Hart and published by . This book was released on 1977 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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

Download or read book Optimized Design and Operation of Solar powered Liquid Desiccant System to Supply Building Fresh Water and Cooling Needs written by Nabil Thabet Audah and published by . This book was released on 2010 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: The developed dehumidification/humidification models of the liquid desiccant system predicted the humidity and temperature of the air leaving the dehumidifier and regenerator tower beds operated with calcium chloride liquid desiccants. The LDS models are integrated with the condenser model to predict the amount of condensate obtained from the humid air leaving the regenerator bed when directed through a coil submerged in cold sea water. The component models are validated with published research work. Our findings from simulations have shown how concentration and the input temperature of the desiccant are the two most important variables in condensing water vapor, and lowering our required thermal regeneration energy as well as its cost. The system as a whole depends solely on solar energy and is sized accordingly to meet both of our air conditioning and water production needs; in addition the operation and sizing of the system can be optimized such that lower sink temperatures may be considered. --An optimization problem is formulated for selection and operation of an LDS system to meet fresh water requirement and cooling load at minimal energy cost for a typical residential space in the city of Beirut with conditioned area of 80 sqm with the objective of producing 15 liters of fresh drinking water a day and meet cooling need of residence at minimum energy cost. The outcome will be compared with a conventional system cost over the cooling season to meet the same needs of the space.

Download or read book Solar Cooling Handbook written by Hans-Martin Henning and published by Birkhäuser. This book was released on 2013-09-17 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: In vielen Ländern trägt die sommerliche Raumklimatisierung maßgeblich zum Energieverbrauch von Gebäuden bei. Eine vielversprechende Möglichkeit zur Reduktion ist die Nutzung von thermischer Solarenergie in Systemen der solar unterstützten Klimatisierung. Der große Vorteil liegt dabei in der weitgehenden Zeitgleichheit von Kühllasten und Solargewinnen, zumindest im saisonalen Maßstab. Allerdings wurden bis heute weltweit nur vergleichsweise wenige Systeme installiert, und es liegen nur geringe Erfahrungen hinsichtlich Auslegung und Betrieb solcher Anlagen vor. Das Ziel dieser mittlerweile in der 3. Auflage vorliegenden Handbuchs ist es, zur Beseitigung dieses Mangels beizutragen und den Planer bei der Auslegung von Anlagen der solar unterstützten Klimatisierung, die thermische Solarkollektoren als Wärmequelle nutzen, zu unterstützen.

Download or read book Sustainable Air Conditioning Systems written by Chaouki Ghenai and published by BoD – Books on Demand. This book was released on 2018-06-13 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air conditioning system is one of the major consumers of electrical energy in many parts of the world today. It represents between 40 and 70% of the energy consumption in commercial buildings. The demand of energy for air conditioning systems is expected to increase further in the next decades due to the population growth, the new economic boom, and the urbanization development. The rapid growth of air conditioning and electricity consumption will contribute further to climate change if fossil and nonrenewable resources are used. More energy-efficient and renewable energy-based air conditioning systems to accomplish space cooling are needed. This book intends to provide the reader with a comprehensive overview of the current state of the art in sustainable air conditioning technologies and focus on the most recent research and development on green air conditioning systems including energy-efficient and renewable energy-based air conditioning systems.

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

Download or read book Latest Trends in Renewable Energy and Environmental Informatics written by WSEAS LLC Staff and published by . This book was released on 2013-03-12 with total page 379 pages. Available in PDF, EPUB and Kindle. Book excerpt: 7th International Conference on Renewable Energy Sources (RES '13) 1st International Conference on Environmental Informatics (ENINF '13)

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:

Download or read book Design and Testing a Solar Cooling System Employing Liquid Desiccants written by Terry G. Lenz and published by . This book was released on 1987 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: A nominal 3-ton (10.5-kw) lithium bromide, open-cycle desiccant cooling system has been designed, installed, and operated. This experimental system dehumidifies ambient air in a packed bed utilizing an aqueous solution of lithium bromide. The absorbent solution is distributed by spray nozzles and flows countercurrent to the air. The dilute solution exiting the dehumidifier is concentrated in a packed bed regenerator by solar heated air. The strong solution is cooled by two heat exchangers before reentering the dehumidifier. Provisions to simulate conditions of high ambient humidity and temperature have been made.

Download or read book Handbook of Air Conditioning and Refrigeration written by Shan K. Wang and published by McGraw Hill Professional. This book was released on 2000-11-07 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt: * A broad range of disciplines--energy conservation and air quality issues, construction and design, and the manufacture of temperature-sensitive products and materials--is covered in this comprehensive handbook * Provide essential, up-to-date HVAC data, codes, standards, and guidelines, all conveniently located in one volume * A definitive reference source on the design, selection and operation of A/C and refrigeration systems

Download or read book Ultrasonic Technology for Desiccant Regeneration written by Ye Yao and published by John Wiley & Sons. This book was released on 2014-12-31 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: The chapters in this volume explore ultrasound-assisted regeneration of silica gel, ultrasound-assisted regeneration for a new honeycomb desiccant material, ultrasound-atomizing regeneration for liquid desiccants, ultrasonic transducers, and much more.