Type de document
Études primaires
Année de publication
2026
Langue
Anglais
Titre de la revue
Building and Environment
Résumé
In occupational risk prevention, collective protection measures based on ventilation to reduce exposure to chemical hazards generally consist of containing a pollutant at its source, capturing it, and releasing it outdoors, after purification when it is applicable. However, unfiltered pollutants that are released can be re-introduced through ventilation air intakes or windows of the same building or neighbouring buildings, depending on wind conditions. Predicting the amount of pollutant re-introduced remains very challenging while essential to implement appropriate risk control measures. In this context, an experimental benchmark has been designed to quantify the dispersion and re-introduction of a pollutant in a reduced-scale building model. It accounts for the wind flow around the building, the building mechanical ventilation system, the emission and tracking of a tracer gas in an atmospheric boundary layer wind tunnel (ABLWT). In addition to measurements of tracer gas concentration in the ventilation exhaust duct for 13 wind directions (0, 15, 30, 45, 50, 60, 75, 90, 135, 180, 225, 270 and 315°) and 3 wind speeds (6.4, 9.0 and 11.1 m/s at the building model height), a mapping of the concentration inside and outside the building at the ventilation air intakes is provided for the worst-case scenario of wind conditions. This experimental data is crucial for validating, under controlled conditions, pollutant dispersion models for both outdoor and indoor environments in a computational fluid dynamics (CFD) framework, as well as for assessing ventilation network simulations using zonal or nodal approaches.
Mots-clés
Pollution atmosphérique, Atmospheric pollution, Distribution des polluants atmosphériques, Distribution of air pollutants, Bâtiment, Building, Ventilation, Détermination expérimentale, Experimental determination, Vent, WInd, Modèle, Model
Numéro de projet IRSST
2023-0050
Citation recommandée
Guichard, R., Jayakumari, A. K. R., Gillmeier, S. et Bahloul, A. (2026). Quantification of pollutant re-introduction through ventilation openings into a building: A benchmark based on wind-tunnel experiments. Building and Environment, article 114262. https://doi.org/10.1016/j.buildenv.2026.114262