Download or read book Membrane Dehumidification and Cooling written by Vivekh Prabakaran and published by Elsevier. This book was released on 2023-04-27 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: Membrane Dehumidification and Cooling: Fundamentals and Applications presents the state-of-the-art on membrane dehumidifiers, highlighting their most recent advancements and providing key insights into global R&D interests. With a strong focus on applications, the book offers characterization techniques to evaluate the potential of hygroscopic materials, as well as experimental methods to study the dehumidifiers' performance. The book begins by highlighting the demerits of conventional cooling systems and then reviews electrically driven alternative cooling solutions. A comparative study between different dehumidification techniques is also given, along with sections on fundamental transport mechanisms and thermodynamic modeling. Finally, scaling, heat transfer and thermodynamic analysis are presented, along with a review of hybrid membrane-based air-conditioners. This book is a one-stop resource for recent advancements in membrane dehumidification and cooling applications. It is an essential read for students, researchers and engineers interested in thermal engineering, heat and mass transfer, alternative cooling, energy materials and dehumidification. - Presents the fundamental aspects and applications of the latest membrane dehumidification technologies - Comprehensively emphasizes new energy materials, experimental techniques, numerical methods, and thermal evaluation frameworks - Focuses on the feasibility of membrane dehumidifiers in the next generation of hybrid cooling systems

Download or read book Membrane Based Dehumidification and Evaporative Cooling Using Wire Mesh Media written by Jared R. Goodnight and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Membrane dehumidification and evaporative cooling applications have the potential to significantly improve the energy efficiency of air conditioning equipment. The use of wire mesh media in such membrane applications is feasible but has not been studied extensively. Therefore, the aim of this work is to investigate the heat and mass transfer performance of several different wire mesh media in membrane based dehumidification and evaporative cooling. There were six wire mesh membranes tested in an experimental facility. The wire mesh membranes vary with respect to percent open area, wire diameter, pore size and material. Two non-permeable, solid membranes were also tested in the facility and compared with the wire mesh membranes. The test section of the experimental facility consists of a narrow air duct and a plate apparatus. The membrane samples were fashioned into rectangular plates and installed into the test section. The plate membranes separate liquid water and air flow streams. The inlet air temperature and humidity are altered to produce condensation or evaporation at the membrane surface. The average convective heat and mass transfer coefficient of the air boundary layer is measured for each of the experimental plates. Membrane based dehumidification and evaporative cooling were accomplished using the wire mesh media. However, the wire mesh membranes did not exhibit any significant differences in their performance. The mesh plates were compared with the solid plate membranes and it was discovered that the solid plates exhibited significantly higher heat transfer coefficients during condensation conditions. This result most likely is due to the formation of large water droplets on the solid plates during condensation. The experimental data is then compared to analytical predictions of the heat and mass transfer coefficients developed from several heat transfer correlations and by invoking the heat and mass transfer analogy. The experimental data is also compared directly with the heat and mass transfer analogy. It was found that the data did not compare well with the heat and mass transfer analogy. This result is attributed to the fact that the membrane surface limits the amount of direct exposure to the gas-liquid interface.

Download or read book Membrane Dehumidifier written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: BEETIT Project: ADMA Products is developing a foil-like membrane for air conditioners that efficiently removes moisture from humid air. ADMA Products's metal foil-like membrane consists of a paper thin, porous metal sheet coated with a layer of water-loving molecules. This new membrane allows water vapor to permeate across the membrane at high fluxes and at the same time, blocks air penetration efficiently resulting in high selectivity. The high selectivity of the membrane translates to less energy use, while the high permeation fluxes result in a more compact device. The new materials and the flat foil-like nature of the membrane facilitate the mass production of a low-coast compact dehumidification device.

Download or read book Heating Ventilating and Air Conditioning written by Faye C. McQuiston and published by John Wiley & Sons. This book was released on 2004-08-06 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: HEATING, VENTILATING, AND AIR CONDITIONING Completely revised with the latest HVAC design practices! Based on the most recent standards from ASHRAE, this Sixth Edition provides complete and up-to-date coverage of all aspects of heating, ventilation, and air conditioning. You’ll find the latest load calculation procedures, indoor air quality procedures, and issues related to ozone depletion. Throughout the text, numerous worked examples clearly show you how to apply the concepts in realistic scenarios. In addition, several computer programs (several new to this edition) help you understand key concepts and allow you to simulate various scenarios, such as psychometrics and air quality, load calculations, piping system design, duct system design, and cooling coil simulation. Additionally, the load calculation program has been revised and updated. These computer programs are available at the book’s website: www.wiley.com/college/mcquiston Key Features of the Sixth Edition Additional new worked examples in the text and on the accompanying software. Chapters 6-9 have been extensively revised for clarity and ease of use. Chapter 8, The Cooling Load, now includes two approaches: the heat balance method, as recommended by ASHRAE, and the simpler RTS method. Both approaches include computer applications to aid in calculations. Provides complete, authoritative treatment of all aspects of HVAC, based on current ASHRAE standards. Numerous worked examples and homework problems provide realistic scenarios to apply concepts.

Download or read book Advances in Air Conditioning Technologies written by Chua Kian Jon and published by Springer Nature. This book was released on 2020-10-21 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights key recent developments in air conditioning technologies for cooling and dehumidification with the specific objectives to improve energy efficiency and to minimize environmental impact. Today, air conditioning, comprising cooling and dehumidification, is a necessity in commercial and residential buildings and even in many industrial processes. This book provides key update on recent developments in air conditioning systems, cooling cycles and innovative cooling/dehumidification technologies. Key technologies related to cooling include heat-driven absorption and adsorption cooling and water-based dew point evaporative cooling. Technologies connected with dehumidification involve new generations of adsorbent–desiccant dehumidifiers, liquid-based desiccants and membranes that sieve out water vapor from air. Losses in cooling cycles and thermo-economic analysis for a sustainable economy are also judiciously documented.

Download or read book Zeolite Membrane Water Vapor Separation for Building Air Conditioning and Ventilation Systems written by Oleksandr Tanskyi and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the findings of a microporous molecular sieve zeolite composite membrane experimental study for dehumidification in building ventilation and air-conditioning systems. The dependence of membrane water and air permeance from inlet airflow parameters (flow rate, humidity, temperature), and permeate total pressure was experimentally studied. Based on the obtained results, the membrane dehumidification system and the membrane air-conditioning system's annual energy efficiency were estimated in an actual building located in a hot and humid climate. Membrane dehumidification process application was considered in three main areas: an energy recovery ventilation (ERV) system, an outdoor air dehumidification for dedicated outdoor air system (DOAS), and an air-conditioning system that combines an evaporative cooling and the membrane dehumidification system. Application of the membrane separation process for building air-conditioning provides several advantages: improvement of an occupant's health and comfort due to better ventilation rate, better energy efficiency, operation without fluorocarbon refrigerant, capability to collect pure water from the airstream during dehumidification process, no condensation during dehumidification provides mold resistant system, and separate control of sensible and latent load. The experimental data revealed, that with the existing technology studied zeolite membrane average effective air permeance does not exceed (3±0.5)E-9 kmol/(kPa-m2-s), and average effective water permeance is at least (5±2)E-6 kmol/kPa-m2-s that provides a membrane selectivity coefficient above 1500. The analytical model of the membrane ERV systems showed that at the design conditions, the ERV system can provide 0.78 cross-flow enthalpy effectiveness with a membrane area of 0.25 m2/cfm (0.42 m2/ (m3/h)). The application of the membrane dehumidification system in a typical office building can provide an increase in dehumidification process energy efficiency from coefficient of performance of 4.1 to 7.4. This change in the coefficient of performance will provide energy savings between 6% and 10% for a conventional HVAC system. The membrane air-conditioning system analysis show that the system operating in actual weather conditions of College Station, Texas can provide annual energy efficiency of 0.98 kW/TR with further possibility to reduce energy consumption to 0.62 kW/TR (COP 5.7). The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155618

Download or read book Dehumidifying Air for Cooling Refrigeration written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Broad Funding Opportunity Announcement Project: Dais is developing a product called NanoAir which dehumidifies the air entering a building to make air conditioning more energy efficient. The system uses a polymer membrane that allows moisture but not air to pass through it. A vacuum behind the membrane pulls water vapor from the air, and a second set of membranes releases the water vapor outside. The membrane's high selectivity translates into reduced energy consumption for dehumidification. Dais' design goals for NanoAir are the use of proprietary materials and processes and industry-standard installation techniques. NanoAir is also complementary to many other energy saving strategies, including energy recovery.

Download or read book Thermodynamic Modeling of a Membrane Dehumidification System written by John David Bynum and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In warm and humid climates, a primary source of building energy consumption is dehumidification of conditioned air supplied to the building spaces. The proposed system utilizes a selective membrane to remove water vapor from ambient air as opposed to a vapor compression cycle or a desiccant. This work provides an analysis of the membrane dehumidification system with a focus on the energy performance of the system. A system performance goal was set at the beginning for a given inlet and outlet ambient air condition and a total cooling load of one ton. The target COP of the combined sensible and latent cooling is 3.58 with a target value for only the latent system of 3.34. Two different simulations were developed including an initial simulation which uses a basic mass transfer model and a simpler condenser model. The initial model was used to develop the system, analyze operating parameters and provide initial performance results. The initial simulations indicate that the system requires two optimizations to meet the target performance: condenser pressure optimization and the use of multiple membrane segments operating at different pressures. The latent only COP including the optimizations was a maximum of 4.23. A second model was then developed which uses a more detailed mass transfer model and a more detailed condenser model based on the operating conditions. This simulation yielded a maximum latent only COP of 4.37 including the optimizations. The work also analyzes two different combined systems capable of providing both sensible and latent cooling. The first utilizes a conventional vapor compression cycle for sensible cooling and has a maximum COP of 3.93. The second uses multiple evaporative coolers in between multiple membrane dehumidification steps and was found to have a maximum COP of 3.73. Second law analysis of the systems was also conducted and found that the greatest reduction in latent system exergy loss can be obtained by improving the selectivity of the membrane. Apart from improving the membrane selectivity, the results show the greatest improvement can be found in improving the operation of the gas compression devices. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/148230

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.

Download or read book Indirect Evaporative Cooler Using Membrane Contained Liquid Desiccant for Dehumidification written by and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indirect evaporative cooler for cooling inlet supply air from a first temperature to a second, lower temperature using a stream of liquid coolant and a stream of exhaust or purge air. The cooler includes a first flow channel for inlet supply air and a second flow channel adjacent the first for exhaust air. The first and second flow channels are defined in part by sheets of a membrane permeable to water vapor such that mass is transferred as a vapor through the membrane from the inlet supply air to a contained liquid desiccant for dehumidification and also to the exhaust air as heat is transferred from the inlet supply air to the liquid coolant. A separation wall divides the liquid desiccant and the coolant but allows heat to be transferred from the supply air to the coolant which releases water vapor to the counter or cross flowing exhaust air.

Download or read book Indirect Evaporative Cooler Using Membrane Contained Liquid Desiccant for Dehumidification written by and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indirect evaporative cooler for cooling inlet supply air from a first temperature to a second, lower temperature using a stream of liquid coolant and a stream of exhaust or purge air. The cooler includes a first flow channel for inlet supply air and a second flow channel adjacent the first for exhaust air. The first and second flow channels are defined in part by sheets of a membrane permeableto water vapor such that mass is transferred as a vapor through the membrane from the inlet supply air to a contained liquid desiccant for dehumidification and also to the exhaust air as heat is transferred from the inlet supply air to the liquid coolant. A separation wall divides the liquid desiccant and the coolant but allows heat to be transferred from the supply air to the coolant whichreleases water vapor to the counter or cross flowing exhaust air.

Download or read book Proceedings of the 2013 International Conference on Material Science and Environmental Engineering 2013 written by Dr. Qingzhou Xu and published by DEStech Publications, Inc. This book was released on 2013-09-05 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: MSEE2013 will provide an excellent international academic forum for sharing knowledge and results in theory, methodology and applications on material science and environmental engineering. In the proceedings, you can learn much more knowledge about the newest research results on material science and advanced materials, material engineering and application, environment protection and sustainable development, and environmental science and engineering all around the world.

Download or read book A Study of Membrane Properties on Air Conditioning Performance written by Elizabeth J. Boyer and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy consumption due to heating, ventilation, and air conditioning amounts to 10-20% of global electrical energy usage. Air conditioning alone uses one trillion kilowatt hours globally. This energy is required for the dehumidification of air in addition to its cooling. New membrane technologies have the potential to decrease air conditioning energy requirements by significant amounts. A membrane acts as a partial heat and mass exchanger in conjunction with a traditional air conditioning system to remove water content and reduce the cooling load. Membranes vary according to their properties and method of mass transport. Liquid membranes have high permeability and selectivity, dense membranes have high selectivity and low permeability, and porous membranes have low selectivity and high permeability. A theoretical model was created to observe how membrane properties affected the potential energy savings of such systems. The most influential properties were flow rate, water permeability and selectivity, membrane area and thickness, and the purge flow temperature. Other properties were determined to be minimally important such as outdoor temperature and humidity. The effect on energy savings in many cases was not a linear relationship but suggested an optimal value beyond which energy savings did not significantly increase. The best simulations showed electrical energy savings of 86-95%.

Download or read book Hollow Fiber Membrane Contactors written by Anil K. Pabby and published by CRC Press. This book was released on 2020-11-23 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book on hollow fiber contractors presents an up-to-date compilation of the latest developments and milestones in this membrane technology. Hollow Fiber Membrane Contactors: Module Fabrication, Design and Operation, and Potential Applications provides a comprehensive discussion of hollow fiber membrane applications (including a few case studies) in biotechnology, chemical, food, and nuclear engineering. The chapters in this book have been classified using the following, based on different ways of contacting fluids with each other: Gas-liquid contacting; Liquid-liquid contacting; Supported liquid membrane; Supported gas membrane; Fluid-fluid contacting. Other features include: Discusses using non-dispersive solvent extraction, hollow fiber strip dispersion, hollow fiber supported liquid membranes and role of process intensification in integrated use of these processes Provides technical and economic perspectives with several case studies related to specific scenarios Demonstrates module fabrication, design, operation and maintenance of hollow fiber contactors for different applications and performance Presents discussion on newer concepts like membrane emulsification, membrane nanoprecipitation, membrane crystallization and membrane condenser Special focus on emerging areas such as the use of hollow fiber contactor in back end of nuclear fuel cycle, membrane distillation, dehumidification of air and gas absorption and stripping Discusses theoretical analysis including computational modeling of different hollow fiber membrane processes, and presents emphasis on newly developed area of hollow fiber membrane based analytical techniques Presents discussion on upcoming area dealing with hollow fiber contactors-based technology in fermentation and enzymatic transformation and in chiral separations This book is equally suited for newcomers to the field, as well as for engineers and scientists that have basic knowledge in this field but are interested in obtaining more information about specific future applications.

Download or read book Membrane Based Technologies for Environmental Pollution Control written by Parimal Pal and published by Butterworth-Heinemann. This book was released on 2020-05-14 with total page 787 pages. Available in PDF, EPUB and Kindle. Book excerpt: Membrane Based Technologiesfor Environmental Pollution Control explains the application of this green technology while offering a systematic approach for accurately utilizing mathematical modeling methods for optimizing system design and scale-up. The book provides in-depth coverage of membrane processes, materials and modules, along with their potential application in various pollution control systems. Each chapter provides a systematic approach for dynamic model development and solutions. With this reference, researchers and those responsible for the design of pollution control systems will find a source that can maximize their efforts to reduce or prevent pollutants from entering all types of environmental media. - Provides a systematic approach for designing membrane technology based systems for pollution reduction or prevention in all types of environmental media - Includes case studies to illustrate actual projects to explain the problems and solutions associated with system scale-up - Introduces dynamic modeling and analysis for process intensification

Download or read book The Humid Threshhold written by Pamela Lucia Cabrera Pardo and published by . This book was released on 2019 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis investigates the possibility of using membranes as a building screen material to dehumidify incoming air that is drawn into a building." -- Page 2.

Download or read book Electrochemical Membrane Technology written by Adewale Giwa and published by Elsevier. This book was released on 2024-01-23 with total page 525 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrochemical Membrane Technology will have a strong impact on electrochemical and membrane separation research in the future and will contribute significantly to academic training and the well-being of human society. This book will include a comprehensive discussion of SWOT analysis of each electrochemical membrane technology, and the discussion of energy production from electrochemical membrane technologies in a separate chapter. This will be based theoretical and experimental studies on electrochemical membrane technologies and applications. Written for chemical and environmental engineers, professors and other university teachers, research scientists, graduate students, water treatment managers, research institutions, and Research and Development departments of industries involved in sustainable water treatment and coproduction of valuable products from water treatment technologies. - Provides comparative analysis of energy production from electrochemical membrane technologies and a comprehensive analysis of the recent advances in these technologies - Discusses the strengths, weaknesses, opportunities, and threats/challenges (SWOT) of each electrochemical membrane technology - Addresses the importance energy co-production