Influence of the height and location of chimneys and utility huts on the contamination of fresh-air intakes: In situ laboratory study Abstract An air intake’s location on the roof of a building is a determining factor for indoor air quality due to the possible reintroduction of contamination from the neighboring exhaust stacks. Ventilation system designers currently use tools such as mathematical models and wind tunnel simulations to estimate the dilution between the source and the air intake. These techniques are valid but do not take into consideration several variables, and sometimes the estimated dilution values differ from the measured values. Using field tests and boundary layer wind tunnel modeling, the authors studied the dilution phenomenon and impact of certain parameters (wind direction, stack height and location, roof irregularities, turbulence, air exhaust velocity) to refine the models used. This project has resulted in the development of guidelines intended for ventilation engineers. The results are also of interest to several professional associations and standardization organizations. Produced Under this Project Scientific Reports The effect of stack height, stack location and rooftop structures on air intake contamination: A laboratory and full-scale study Research Report: R-391, R-392 Simplified Articles Qualité de l'air des édifices L'influence de la hauteur et de l'emplacemenet des cheminées Volume 18, n0 3 Scientific Publications Dilution of exhaust from a rooftop stack on a cubical building in an urban environmentSaathoff P., Lazure L., Stathopoulos T., Wei X.Source : Atmospheric Environment, vol. 36, no 29, 2002, p. 4577-4591The influence of a rooftop structure on the dispersion of exhaust from a rooftop stackSaathoff P., Lazure L., Stathopoulos T., Peperkamp H.Source : in 2002 American Society of Heating, Refrigerating and Air-Conditioning Engineers / ASHRAE Annual Meeting Program (June 22-26, 2002 : Honolulu, HI), ASHRAE Transactions, HI-02-15-2, 2002, p.1029-1038Dispersion of Emissions from a Low Building Located Downwind a Tall Building Saathoff P., Gupta A., Stathopoulos T., Lazure L.Source : in Proceedings of PHYSMOD2003 : International Workshop on Physical Modeling of Flow Dispersion Phenomena (September 3-5, 2003 : Prato, Italie), 2003, p. 1-8Effect of Rooftop Structures on the Plume from a Nearby StackSaathoff P., Gupta A., Stathopoulos T., Lazure L.Source : in 11th International Conference on Wind Engineering (11th : June 2-5, 2003 : Texas Tech University, Lubbock, Texas), 2003The influence of structure on the dispersion of exhaust from a rooftop stackSaathoff P., Lazure L., Stathopoulos T., Peperkamp H.Source : ASHRAE Transactions, vol. 108, 2002, p. 1029-1038Wind effects on the building environmentStathopoulos T.Source : in Impact of Wind and Storm on City life and Built Environment : 2nd Workshop organized by the COST Action C14 (2nd : November 21-22, 2003 : Ioannina, Greece), 2003 Wind-induced dispersion of exhaust from rooftop structures and air-intake contaminationStathopoulos T., Lazure L., Saathoff P., Gupta A.Source : in International Symposiumon Wind Effects on Buildings and Urban Environment (1st : March 8-9 : Tokyo, Japan), 2004Dispersion of Exhaust from a Rooftop Stack in an Urban EnvironmentSaathoff P., Lazure L., Stathopoulos T.Source : In Going global : American Industrial Hygiene Conference & Exposition : the premier conference on occupational and environmental health and safety (1st : June 5-11, 1999 : Toronto, Canada), 1999, p. 26Wind-induced dispersion of pollutants from building exhaust in the urban environmentStathopoulos T., Lazure L., Saathoff P., Gupta A.Source : in International Workshop on Wind Engineering and Sciences, (October 29-30, 2004 : New Delhi, India), 2004Wind tunnel simulation of tracer gas experiments performed in an urban environment: scaling considerationsSaathoff P., Gupta A., Stathopoulos T., Lazure L.Source : in A&WMA's 98th Annual Conference & Exhibition, (98th : June 21-24, 2005 : Minneapolis, U.S.A.), 2005Développement d'un outil d'évaluation de la sécurité aux quais de transbordementBournival S.Source : Mémoire de maîtrise. Trois-Rivières, Université du Québec à Trois-Rivières, 2005Wind-induced Dispersion of Pollutants from Building ExhaustStathopoulos T.Source : Wind Effects Bulletin, vol. 3, 2005Contamination of fresh air intakes due to downwash from a rooftop structureSaathoff P., Gupta A., Stathopoulos T., Lazure L.Source : Journal of the Air Waste Management Association, vol. 59, no 3, 2009, p. 343-353 Other Project(s) You May be Interested in Evaluation of Direct Reading Instrument and Filtration Technology Performance to Improve Strategies to Control Workers’ Exposure to Ozone Additional Information Type: Project Number: 0099-0230 Status: Completed Year of completion: 2004 Research Field: Chemical and Biological Hazard Prevention Team: Louis Lazure (IRSST)Ted Stathopoulos (Université Concordia)Claude Létourneau (IRSST)Patrick Saathoff (Université Concordia)