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Assessment of Pollutant Dispersion from Rooftop Stacks: ASHRAE, ADMS and Wind Tunnel Simulation

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Assessment of Pollutant Dispersion from Rooftop Stacks: ASHRAE, ADMS and Wind Tunnel Simulation

Hajra, B., Stathopoulos, T. and Bahloul, A. (2010) Assessment of Pollutant Dispersion from Rooftop Stacks: ASHRAE, ADMS and Wind Tunnel Simulation. Building and Environment, 45 (12). pp. 2768-2777.

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Official URL: http://dx.doi.org/10.1016/j.buildenv.2010.06.006

Abstract

The prediction of downwind concentration of effluents from stack located on top of buildings is important. Most current dispersion models assess the pollutant concentration at distances away from the building. It is important to study pollutant dispersion within the recirculation zone of the building, since studies have shown that effluents released from rooftop stacks have a tendency to re-enter the building through intakes located on the roof. These effects get more pronounced with the influence of RoofTop Structures (RTS). This paper presents a comparative study of the Atmospheric Dispersion Modelling System (ADMS), American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE 2003 and 2007 versions) and wind tunnel results. Four different cases involving a low-rise and high-rise building for stack heights (hs) ranging from 1 m to 7 m, exhaust momentum ratios (M) ranging from 1 to 5 and wind direction (θ) of 0° and 45°, have been studied for neutral atmospheric stability conditions. In this regard the effect of RTS has also been examined by using wind tunnel, ADMS and ASHRAE models. ADMS yields higher dilutions near the stack at θ = 0° and cannot model the effect of RTS. Wind tunnel data compare well with ASHRAE 2003 at M = 5 for the low-rise building, but generally predict higher dilutions for the high-rise building. ASHRAE 2003 predicts lower dilutions than ADMS for the high-rise building, while ASHRAE 2007 yields very low dilutions for all cases, suggesting a need to reassess its suitability for practical design.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Building, Civil and Environmental Engineering
Item Type:Article
Refereed:Yes
Authors:Hajra, B. and Stathopoulos, T. and Bahloul, A.
Journal or Publication:Building and Environment
Date:2010
Digital Object Identifier (DOI):10.1016/j.buildenv.2010.06.006
ID Code:981687
Deposited By: THEODORE STATHOPOULOS
Deposited On:20 Sep 2016 15:28
Last Modified:18 Jan 2018 17:53
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