Membrane Dehumidification And Cooling

Author : Vivekh Prabakaran
Publisher : Elsevier
ISBN 13 : 0323955304
Total Pages : 220 pages
Book Rating : 4.00/5 ( download)

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Download or read book Membrane Dehumidification and Cooling written by Vivekh Prabakaran and published by Elsevier. This book was released on 2023-05-01 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

Author : Jared R. Goodnight
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.61/5 ( download)

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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.

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.87/5 ( download)

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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.

Author : Chua Kian Jon
Publisher : Springer Nature
ISBN 13 : 981158477X
Total Pages : 313 pages
Book Rating : 4.70/5 ( download)

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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.

Author : Faye C. McQuiston
Publisher : John Wiley & Sons
ISBN 13 : 0471470155
Total Pages : 648 pages
Book Rating : 4.51/5 ( download)

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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.

Author :
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.55/5 ( download)

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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.

Author : Oleksandr Tanskyi
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.59/5 ( download)

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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

Author : Dr. Qingzhou Xu
Publisher : DEStech Publications, Inc
ISBN 13 : 1605951250
Total Pages : 584 pages
Book Rating : 4.56/5 ( download)

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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.

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.76/5 ( download)

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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.

Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.26/5 ( download)

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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.