Analytical Evaluation of Dispersion of Exhaust from Rooftop Stacks on Buildings PDF Download
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Author: Theodore Stathopoulos
Publisher:
ISBN: 9782896312900
Category :
Languages : en
Pages : 71
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Book Description
Author: Theodore Stathopoulos
Publisher:
ISBN: 9782896312900
Category :
Languages : en
Pages : 71
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Book Description
Author:
Publisher:
ISBN: 9782896312917
Category : Air quality
Languages : en
Pages : 71
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Book Description
Author: Yukio Tamura
Publisher: Springer
ISBN: 4431559124
Category : Science
Languages : en
Pages : 200
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Book Description
This book is highly suitable for advanced courses as it introduces state-of-the-art information and the latest research results on diverse problems in the environmental wind engineering field. The topics include indoor natural ventilation, pedestrian wind environment, pollutant dispersion, urban heat island phenomena, urban ventilation, indoor/outdoor thermal comfort, and experimental/numerical techniques to analyze those issues. Winds have a great influence on the outdoor environment, especially in urban areas. Problems that they cause can be attributed to either strong wind or weak wind issues. Strong winds around high-rise buildings can bring about unpleasant, and in some cases dangerous, situations for people in the outdoor environment. On the other hand, weak wind conditions can also cause problems such as air pollution and heat island phenomena in urban areas. Winds enhance urban ventilation and reduce those problems. They also enhance natural ventilation in buildings, which can reduce the energy consumption of mechanical ventilation fans and air conditioners for cooling. Moderate winds improve human thermal comfort in both indoor and outdoor environments in summer. Environmental wind engineering associated with wind tunnel experiments and numerical analysis can contribute to solutions to these issues.
Author: Charalambos Baniotopoulos
Publisher: Springer Science & Business Media
ISBN: 3709109531
Category : Technology & Engineering
Languages : en
Pages : 353
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Book Description
The book presents a state-of-the-art in environmental aerodynamics and the structural design of wind energy support structures, particularly from a modern computational perspective. Examples include real-life applications dealing with pollutant dispersion in the building environment, pedestrian-level winds, comfort levels, relevant legislation and remedial measures. Design methodologies for wind energy structures include reliability assessment and code frameworks.
Author: Liangzhu Leon Wang
Publisher: Springer Nature
ISBN: 9811998221
Category : Technology & Engineering
Languages : en
Pages : 2933
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Book Description
This book is a compilation of selected papers from the 5th International Conference on Building Energy and Environment (COBEE2022), held in Montreal, Canada, in July 2022. The work focuses on the most recent technologies and knowledge of building energy and the environment, including health, energy, urban microclimate, smart cities, safety, etc. The contents make valuable contributions to academic researchers, engineers in the industry, and regulators of buildings. As well, readers encounter new ideas for achieving healthy, comfortable, energy-efficient, resilient, and safe buildings.
Author: Xiaoguang Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The precise prediction of plume concentration distribution on or near buildings is very important for building engineers to design proper exhaust stacks and set proper air intakes to avoid adverse air quality impacts. The present study simulates the dispersion of emissions from stacks in the neutrally stable atmospheric boundary layer (ABL) by FLUENT 6.1, a commercial computational fluid dynamics (CFD) code. Three case studies have been conducted. The first case involves a simulation of plume dispersion from one isolated stack. The second case is concerned with a simulation of plume dispersion from a flush stack located at the roof center of a cubic building. The third case involves a simulation of plume dispersion from a short stack located on the rooftop of a rectangular building with some rooftop structures. Numerical results are compared with some empirical formulae, such as the Gaussian model and ASHRAE model, and validated with some experimental data. The effects of the momentum ratio, the stack height, and the turbulent characteristics caused by the building on the plume behavior are discussed. Some numerical parametric studies have been carried out.
Author: Tingzhen Ming
Publisher: Springer
ISBN: 981103821X
Category : Science
Languages : en
Pages : 134
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Book Description
This book discusses energy transfer, fluid flow and pollution in built environments. It provides a comprehensive overview of the highly detailed fundamental theories as well as the technologies used and the application of heat and mass transfer and fluid flow in built environments, with a focus on the mathematical models and computational and experimental methods. It is a valuable resource for researchers in the fields of buildings and environment, heat transfer and global warming.
Author: Amit Gupta
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
One of the major causes of poor indoor air quality in buildings is exhaust re-ingestion at fresh air intakes. The downwash effect of an RTS on plume may lead to significantly increased levels of re-ingestion. The present study aims to quantify the downwash effect of an RTS located upwind of a stack. Wind-tunnel modeling is used to model the flow and dispersion associated with various building/RTS arrangements with a focus on "micro-scale" urban dispersion; that is, modeling dispersion within a range of 100 m of the building exhaust. Wind-tunnel techniques include flow visualization and tracer gas experiments. The influence of various key parameters, such as building height, RTS crosswind width, stack height, exhaust momentum ratio, stack location, and wind direction is considered. Concentration measurements were obtained at sampling locations downwind of the RTS on the building roof. It was found that the downwash effect of RTS on plumes could increase roof -level concentrations by a factor of 2 to 100. The RTS downwash effect was intensified with an increase in RTS crosswind width and was generally stronger for an oblique wind than for a normal wind. The results also showed that an RTS engulfed inside the building recirculation zone may not have a significant effect on plume dispersion for winds approximately normal to the building face. The minimum dilution models recommended by ASHRAE (2003, 2007) as well as the ASHRAE Geometric Stack Design Method (AGM) were evaluated. It was found that the ASHRAE models do not account for the downwash effect of the RTS on plumes and result in either overly conservative or un-conservative predictions. Therefore, a new empirical model, which takes into consideration the downwash effect of RTS was proposed. A validation study of the proposed model using results from previous experimental studies showed that the model is more accurate than the ASHRAE dilution models. Thus the proposed model will be very useful to practicing engineers. In addition, some modifications to the ASHRAE (2007) dispersion model and the AGM are also proposed.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 162
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Book Description
One of the major causes of poor indoor air quality at some facilities is the sporadic occurrence of exhaust reingestion at fresh air intakes. This report describes the second phase of a study of the dispersion of plumes emitted from buildings in an urban environment. The main goals were to evaluate & improve the two most commonly used modelling tools (empirical design formulas and wind tunnel simulation) for the assessment of concentration of rooftop stack exhaust at various locations; and development of design guidelines to assist engineers in the proper selection of location, geometry, & functional characteristics of rooftop chimneys. The study included field tests using tracer gases & a portable fan as an emission source, carried out on a three-storey building in Montreal. The field test investigated the influence of the following factors on short-range plume dispersion: stack location relative to regions of flow separation; stack height; the exhaust velocity/wind speed ratio (M value); atmospheric turbulence; rooftop structures; and a taller upwind adjacent building. In addition, a parametric study in a wind tunnel provided more detailed information regarding the influence of stack height and M value on plume dispersion.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 620
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Book Description
