Experimental study on the influence of supply terminal shape on temperature, contaminant distributions and flow characteristics in impinging jet ventilation

Lee, Sungeun; Kobayashi, Tomohiro; Yamasawa, Haruna et al.

Building and Environment, 2026, 293, 114329

Number of Access:26（2026-05-25 02:48 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/104602

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Title
Experimental study on the influence of supply terminal shape on temperature, contaminant distributions and flow characteristics in impinging jet ventilation
Creator
CreatorName
Lee, Sungeun
NRID
1000090580952 1000090580952
ORCID
0000-0003-4956-1274 0000-0003-4956-1274
researchmap permalink
tkoba_0151426 tkoba_0151426
Scopus Author ID
55724294200 55724294200
CreatorName
Kobayashi, Tomohiro
NRID
1000080982305 1000080982305
ORCID
0000-0002-1262-8781 0000-0002-1262-8781
researchmap permalink
yamasaswa_haruna yamasaswa_haruna
Scopus Author ID
57221740075 57221740075
CreatorName
Yamasawa, Haruna
CreatorName
Kida, Kentaro
Subject
Impinging jet ventilation (IJV)
Indoor environment
Jet characteristics
Supply terminal shape
Ventilation effectiveness
Description
Lee S., Kobayashi T., Yamasawa H., et al. Experimental study on the influence of supply terminal shape on temperature, contaminant distributions and flow characteristics in impinging jet ventilation. Building and Environment 293, 114329 (2026); https://doi.org/10.1016/j.buildenv.2026.114329.
Abstract
Impinging jet ventilation (IJV) systems provide higher ventilation effectiveness in the occupied zone compared to traditional mixing ventilation systems. However, IJV system design requires careful consideration of parameters influencing the indoor environment, among which the supply terminal shape could be one of the important parameters. This study aims to investigate the impact of the IJV supply terminal shape on the indoor environment and the impinging jet characteristics. Full-scale experiments were conducted using three different slit-type supply terminals, measuring indoor temperature, CO₂ concentration assuming contaminants, and impinging jet velocity distribution. The experimental results indicated that under the low airflow rate conditions, the supply terminal shape had little impact on the indoor environment, whereas under the high airflow rate conditions, the heat and contaminant removal effectiveness showed a decreasing tendency with increasing the aspect ratio of the supply terminal. The stratification height of CO₂ concentration rose as the airflow rate increased as is well-known, and it was not affected by terminal shape at low supply flow rate conditions. However, when supply airflow rate is large, it was located lower as the aspect ratio of the terminal became higher. Analysis of impinging jet characteristics indicated that a lower aspect ratio of the supply terminal produced more diffusive airflows than the higher aspect ratio terminal. Also, the velocity of the airflow reaching a heating element was higher at the higher aspect ratio conditions. These variations in jet characteristics could affect the indoor environment by changing air distribution patterns and plume flow rate.
Publisher
Elsevier Ltd
Source Title
Building and Environment
Volume (Issue)
293
Page
114329
Date of Issued
2026-02-10
Language
English
Handle URL
https://hdl.handle.net/11094/104602
PISSN
03601323
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.buildenv.2026.114329
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article