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Author: Sho Sol Takagaki
Publisher:
ISBN:
Category :
Languages : en
Pages : 582
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Author: Sho Sol Takagaki
Publisher:
ISBN:
Category :
Languages : en
Pages : 582
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Author: Dominique Thomas
Publisher: Elsevier
ISBN: 008102116X
Category : Science
Languages : en
Pages : 228
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Book Description
Filtration of aerosols is omnipresent in our daily lives, in areas as diverse as health, the protection of people and the environment, and air treatment inside buildings. However, the collection of particles within a filter media is not, contrary to popular belief, linked to a simple screen effect. The phenomena involved are much more complex and require the consideration of aerosol interactions, filter media and process conditions to select the best fiber filter for a given application. Aerosol Filtration, book for students, hygiene or process engineers, fibrous media manufacturers, designers, and filtration system suppliers or users addresses the filtration of aerosols in six chapters. These chapters cover physics and aerosol characterization, the fibrous media, and efficiency and filter clogging by solid or liquid aerosols, with special attention to the filtration of the nanoparticles. - Analyses the behavior of fibrous media against solid and liquid aerosols - Presents models of efficiency and pressure drop - Introduces computing elements for estimating the lifetime of filters - Provides guidance for designing filters and predicting their behavior over time
Author:
Publisher:
ISBN:
Category : Air filters
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 774
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Book Description
Author: Daniel A. Vallero
Publisher: Elsevier
ISBN: 0128149353
Category : Medical
Languages : en
Pages : 571
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Book Description
Air Pollution Calculations introduces the equations and formulae that are most important to air pollution, but goes a step further. Most texts lack examples of how these equations and formulae apply to the quantification of real-world scenarios and conditions. The ample example calculations apply to current air quality problems, including emission inventories, risk estimations, biogeochemical cycling assessments, and efficiencies in air pollution control technologies. In addition, the book explains thermodynamics and fluid dynamics in step-by-step and understandable calculations using air quality and multimedia modeling, reliability engineering and engineering economics using practical examples likely to be encountered by scientists, engineers, managers and decision makers. The book touches on the environmental variables, constraints and drivers that can influence pollutant mass, volume and concentrations, which in turn determine toxicity and adverse outcomes caused by air pollution. How the pollutants form, move, partition, transform and find their fate are explained using the entire range of atmospheric phenomena. The control, prevention and mitigation of air pollution are explained based on physical, chemical and biological principles which is crucial to science-based policy and decision-making. Users will find this to be a comprehensive, single resource that will help them understand air pollution, quantify existing data, and help those whose work is impacted by air pollution. Explains air pollution in a comprehensive manner, enabling readers to understand how to measure and assess risks to human populations and ecosystems actually or potentially exposed to air pollutants Covers air pollution from a multivariate, systems approach, bringing in atmospheric processes, health impacts, environmental impacts, controls and prevention Facilitates an understanding of broad factors, like climate and transport, that influence patterns and change in pollutant concentrations, both spatially and over time
Author: Qisheng Ou
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 208
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Book Description
Particle control technologies are essential in many manufacturing industries (electronic and chemical industrial, mineral processing, and food and beverages) as well as in pollution abatement and environmental control (for example, post processing of power plant emissions and clean rooms). A variety of particle control technologies using various mechanisms have been developed. Among these technologies, filtration is known as the most economical for achieving high removal efficiency of fine aerosol particles. In numerous existing studies on the loading process of particle filtration, two assumptions are usually made: (1) particles are spherical or nearly spherical in shape and (2) particles are uniformly deposited on filter medium. However, in practical applications, these two assumptions are not always met. Agglomerate particles with non-spherical shape are ubiquitous in industrial processing and ambient environment, and non-uniform particle depositions are often met. The overall objective of this dissertation is to advance our current knowledge on these two specific areas of aerosol filtration: (1) agglomerate particle filtration and (2) particle deposition uniformity. For the first part, Agglomerate Particle Filtration, a system which is able to generate stable and controllable agglomerate particles was developed. Both branch-like and chain-like agglomerate particles were generated through the system, and their morphologies were characterized using both online and offline methods. Series of filter loading experiments were performed to study the filtration behavior of fibrous filters loaded with agglomerate particles over the entire filter lifetime, including the initial filtration, depth filtration, transition filtration and surface filtration. The filtration and loading of agglomerate particles exhibited different behaviors than those of spherical particles. Different effects, including filter media, fractal dimension of agglomerate particles, and the overall mobility size of agglomerate particles, on the loading behavior were explored. Moreover, for predicting the loading behavior of agglomerate particles, two semi-empirical models were proposed by modifying existing models. Good agreements were found for both of them. For the second part, Particle Deposition Uniformity, particle depositions under two scenarios were investigated. In the first scenario, particle deposition along pleated filter panels was studied using a COMSOL-Matlab based numerical model. The evolutions of particle deposition profile and pressure drop of pleated filter panels during dynamic particle loading process were investigated. The model was validated by experimental loading tests. In the second scenario, particle deposition uniformity on HVAC entrance filter panels installed in an aircraft was studied by a computational fluid dynamics model. The flow fields around entrance filter panels and particle depositions on them were investigated. Factors affecting particle deposition uniformity were identified and explored.
Author: Constantine D. Rakopoulos
Publisher: Springer Science & Business Media
ISBN: 1848823754
Category : Technology & Engineering
Languages : en
Pages : 408
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Book Description
Traditionally, the study of internal combustion engines operation has focused on the steady-state performance. However, the daily driving schedule of automotive and truck engines is inherently related to unsteady conditions. In fact, only a very small portion of a vehicle’s operating pattern is true steady-state, e. g. , when cruising on a motorway. Moreover, the most critical conditions encountered by industrial or marine engines are met during transients too. Unfortunately, the transient operation of turbocharged diesel engines has been associated with slow acceleration rate, hence poor driveability, and overshoot in particulate, gaseous and noise emissions. Despite the relatively large number of published papers, this very important subject has been treated in the past scarcely and only segmentally as regards reference books. Merely two chapters, one in the book Turbocharging the Internal Combustion Engine by N. Watson and M. S. Janota (McMillan Press, 1982) and another one written by D. E. Winterbone in the book The Thermodynamics and Gas Dynamics of Internal Combustion Engines, Vol. II edited by J. H. Horlock and D. E. Winterbone (Clarendon Press, 1986) are dedicated to transient operation. Both books, now out of print, were published a long time ago. Then, it seems reasonable to try to expand on these pioneering works, taking into account the recent technological advances and particularly the global concern about environmental pollution, which has intensified the research on transient (diesel) engine operation, typically through the Transient Cycles certification of new vehicles.
Author: Colleen Steil Michaels
Publisher:
ISBN:
Category :
Languages : en
Pages : 298
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Author: Zhonglin Xu
Publisher: Springer Science & Business Media
ISBN: 3642393748
Category : Technology & Engineering
Languages : en
Pages : 871
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Book Description
Fundamentals of Air Cleaning Technology and Its Application in Cleanrooms sets up the theoretical framework for cleanrooms. New ideas and methods are presented, which include the characteristic index of cleanrooms, uniform and non-uniform distribution characteristics, the minimum sampling volume, a new concept of outdoor air conditioning and the fundamentals of leakage-preventing layers. Written by an author who can look back on major scientific achievements and 50 years of experience in this field, this book offers a concise and accessible introduction to the fundamentals of air cleaning technology and its application. The work is intended for researchers, college teachers, graduates, designers, technicians and corporate R&D personnel in the field of HVAC and air cleaning technology. Zhonglin Xu is a senior research fellow at China Academy of Building Research.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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