Field study assessment of the performance of displacement air distribution in a canadian school during the heating season

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TypeArticle
Journal titleInternational Journal of Ventilation
ISSN1473-3315
Volume11
Issue1
Pages4351; # of pages: 9
Subjectstratified ventilation; Contaminant removal; Displacement ventilation system; IAQ; Pollutant distribution; Carbon dioxide; Hot water heating; Thermal comfort
AbstractStratified ventilation systems use a fundamentally different approach to supply heated or cooled air through a building than the 'fully mixed and dilution' ventilation systems found in the majority of non-residential buildings. Stratified air distribution creates a non-uniform environment in terms of temperature and pollutant distribution, and acceptable conditions in the occupied zone. Previous research has shown that this type of system works well for regions where buildings require year-round cooling. However there are a growing number of buildings using this approach in Canada, where buildings require heating during winter months. This paper presents results from a field study conducted in a school equipped with a displacement ventilation system. The results show that the measured contaminant removal efficiency (based on CO 2 measurements) resulting from displacement ventilation in this case is better than that was predicted in previous studies for displacement ventilation under heating operation. In addition, key predictors of thermal comfort (the measured vertical air temperature difference and draft rating at ankle and head height) are also generally within the limits set by applicable ASHRAE standards.
Publication date
LanguageEnglish
AffiliationConstruction; National Research Council Canada
Peer reviewedYes
NPARC number21270098
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Record identifierdd88c2fc-06c4-4774-83dd-da30e130b7c8
Record created2013-12-23
Record modified2017-04-05
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