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Experimental Investigation on the velocity profile of supply flow in impinging jet ventilation system
Kyushu University, Fukuoka, Japan.
Osaka University, Osaka, Japan.
Osaka University, Osaka, Japan.
Osaka University, Osaka, Japan.
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2023 (English)In: E3S Web of Conferences / [ed] Ooka R., EDP Sciences , 2023, Vol. 396, article id 02014Conference paper, Published paper (Refereed)
Abstract [en]

Using the impinging jet ventilation system (IJV), it is possible to accomplish high ventilation effectiveness by creating temperature and contaminant stratification within the room. Since the air is supplied toward the floor and directly spreads into the occupied zone at the lower level, it is important to understand the flow feature of supplied jet around the floor. To understand this, the velocity profile of the jet around the floor at the central cross-section was measured using hotwire anemometer under isothermal conditions, and particle image velocimetry (PIV) under isothermal, cooling, and heating conditions. As a result, the obtained velocity profiles at the central cross-section by the hotwire anemometer and PIV are almost the same in the region more than 0.5 m horizontally away from the supply duct. The velocity in the region close to the supply duct was underestimated when using PIV, due to the insufficient entrainment of the surrounding air. However, its measurement accuracy is assumed to be sufficient for the flow that goes into the occupied zone. In addition, it was also shown that at the central-cross section, the velocity profiles under isothermal and cooling conditions are almost the same.

Place, publisher, year, edition, pages
EDP Sciences , 2023. Vol. 396, article id 02014
Series
E3S Web of Conferences, ISSN 2555-0403
National Category
Energy Engineering
Research subject
Sustainable Urban Development
Identifiers
URN: urn:nbn:se:hig:diva-41796DOI: 10.1051/e3sconf/202339602014Scopus ID: 2-s2.0-85164531663OAI: oai:DiVA.org:hig-41796DiVA, id: diva2:1758037
Conference
IAQVEC 2023, 11th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings, 20-23 May 2023, Tokyo, Japan
Available from: 2023-05-21 Created: 2023-05-21 Last updated: 2023-07-24Bibliographically approved

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Cehlin, MathiasAmeen, Arman

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Citation style
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