E3S Web of Conf.
Volume 396, 2023The 11th International Conference on Indoor Air Quality, Ventilation & Energy Conservation in Buildings (IAQVEC2023)
|Number of page(s)||5|
|Section||Ventilation and Airflow in Buildings|
|Published online||16 June 2023|
Experimental Investigation on the velocity profile of supply flow in impinging jet ventilation system
1 JSPS Research Fellow PD, Faculty of Environmental Science, Kyushu University, Fukuoka, Japan.
2 Division of Global Architecture, Graduate School of Engineering, Osaka University, Osaka, Japan.
3 Faculty of Engineering and Sustainable Development, University of Gävle, Gävle, Sweden.
* Corresponding author: email@example.com
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 over 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 seeding tracer. 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.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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