Raphe, Peyman, Ameur, Mohamed et Ross, Douglas.
2025.
« A novel CFD-experimental analysis for enhancing air distribution and indoor air quality in existing buildings using high induction diffusers ».
In Proceedings of the CSME-CFDSC-CSR 2025 International Congress (Montreal, QC, Canada, May 25-28, 2025)
Coll. « Progress in Canadian Mechanical Engineering », vol. 8.
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Résumé
Between 2000 and 2021, Canada’s energy use rose by 10%, though efficiency gains prevented a 21% increase. Space heating and cooling dominate consumption, making up 63% in homes and 61% in commercial buildings. Ceiling-based ventilation worsens thermal stratification, raising energy use and lowering indoor air quality. This study explores high-induction diffusers for better ventilation without increasing heating and cooling loads. A combined computational fluid dynamic (CFD) and experimental approach was employed to evaluate the ventilation effectiveness of high-induction diffusers in comparison to conventional diffuser designs. The study utilized ASHRAE Standards 62.1 and 129 to quantify ventilation effectiveness (Ez), while evaluating the local mean age of air. Experimental measurements were conducted at the Indoor Environment Research Facility (IERF), assessing air distribution performance under controlled conditions using tracer gas decay methods with sulfur hexafluoride (SF6). Results indicate that high-induction diffusers significantly improve air mixing, reducing thermal stratification and localized discomfort. Enhanced entrainment leads to a higher Ez value, thereby optimizing airflow distribution and mitigating the necessity for supplementary heating or cooling devices. In retrofitted systems, increased Ez improves IAQ without increasing ventilation rates, whereas in new HVAC designs, it enables reductions in outdoor air requirements, minimizing system oversizing and reducing energy consumption. Findings suggest that integrating high-induction diffusers in ventilation systems can enhance occupant comfort, lower HVAC operational costs, and support energy conservation efforts up to 25%. This study contributes to advancing HVAC design by demonstrating that optimizing air diffusion strategies can achieve both energy efficiency and improved thermal comfort in commercial and residential buildings.
| Type de document: | Compte rendu de conférence |
|---|---|
| Éditeurs: | Éditeurs ORCID Hof, Lucas A. NON SPÉCIFIÉ Di Labbio, Giuseppe NON SPÉCIFIÉ Tahan, Antoine NON SPÉCIFIÉ Sanjosé, Marlène NON SPÉCIFIÉ Lalonde, Sébastien NON SPÉCIFIÉ Demarquette, Nicole R. NON SPÉCIFIÉ |
| Date de dépôt: | 18 déc. 2025 15:21 |
| Dernière modification: | 18 déc. 2025 15:21 |
| URI: | https://espace2.etsmtl.ca/id/eprint/32485 |
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