Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation

Yoshihara, Jun; Yamanaka, Toshio; Choi, Narae; Kobayashi, Tomohiro; Kobayashi, Noriaki; Fujiwara, Aoi

doi:https://doi.org/10.1016/j.buildenv.2024.111911

Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation

Yoshihara, Jun; Yamanaka, Toshio; Choi, Narae et al.

Building and Environment, 2024, 265, 111911

アクセス数:50件（2025-05-14 00:55 集計）

固定URL: https://hdl.handle.net/11094/98322

閲覧可能ファイル

ファイル	フォーマット	利用条件	サイズ	閲覧回数	利用開始日	説明	information
BuildEnviron_265_111911	pdf	なし	13.4 MB	31	2024.10.24

Creative Commons : 表示

論文情報

ファイル出力 EndNote Basic出力 Mendeley出力

タイトル	Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation
著者	著者名 Yoshihara, Jun
	NRID 1000080182575 1000080182575 researchmap permalink read0014081 read0014081 著者名 Yamanaka, Toshio
	NRID 1000010826481 1000010826481 著者名 Choi, Narae
	NRID 1000090580952 1000090580952 ORCID 0000-0003-4956-1274 0000-0003-4956-1274 researchmap permalink tkoba_0151426 tkoba_0151426 Scopus Author ID 55724294200 55724294200 著者名 Kobayashi, Tomohiro
	NRID 1000060880656 1000060880656 researchmap permalink kobayashi-noriaki kobayashi-noriaki 著者名 Kobayashi, Noriaki
	著者名 Fujiwara, Aoi
キーワード等	Airborne transmission
	Consulting (examination) room
	Floor-supply displacement ventilation (FSDV)
	Local exhaust ventilation (LEV)
	SARS-CoV-2
	Wells-Riley model
内容	Yoshihara J., Yamanaka T., Choi N., et al. Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation. Building and Environment 265, 111911 (2024); https://doi.org/10.1016/j.buildenv.2024.111911.
抄録	This study proposes using a local exhaust ventilation system (LEV) to prevent airborne infections, especially for short-range conversations. We compared the performance of a hood in three different underfloor air distribution systems (UFAD): floor-supply displacement ventilation (FSDV), horizontal flow-type floor diffuser (HFD), and swirling flow-type floor diffuser (SFD). Two situations were considered: Case A, a consulting room, and Case B, a restaurant or meeting room. The difference in infection risk assessment between using CO2 and artificial saliva particles as tracers of exhaled breath was also discussed. Results indicate that the distribution of exhaled air and infection risk for doctors decreased in the order FSDV < HFD < SFD. Although the effect of introducing hoods was confirmed to a certain degree for the three ventilation methods in Case A, the effect of the hoods on the quanta concentration of the facing person was small in Case B. Comparing airborne infection risks between gas and particles, particle-based airborne infection was smaller in the FSDV due to the more significant impact of particle adhesion and falling. As a limitation, the ventilation rate in the experiment was 1000 m3/h (50 ACH). Therefore, the air supply method had a more significant impact on the results than the hood method. A practical implication of this experiment is that even under high ventilation volumes (50 ACH), the FSDV can reduce the horizontal distribution of the patient's exhaled air and prevent airborne infection. These results should be adapted to smaller spaces such as examination rooms and meeting rooms.
出版者	Elsevier Ltd
収録物名	Building and Environment
巻(号)	265
ページ	111911
刊行年月	2024-11-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/98322
PISSN	03601323
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.buildenv.2024.111911
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution 4.0 International License.
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCTERMS.bibliographicCitation	Building and Environment. 2024, 265, p. 111911
DC.title	Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation
DC.creator	Yoshihara, Jun
	Yamanaka, Toshio
	Choi, Narae
	Kobayashi, Tomohiro
	Kobayashi, Noriaki
	Fujiwara, Aoi
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2024-11-01
DC.identifier	https://doi.org/10.1016/j.buildenv.2024.111911
DC.subject	Airborne transmission
	Consulting (examination) room
	Floor-supply displacement ventilation (FSDV)
	Local exhaust ventilation (LEV)
	SARS-CoV-2
	Wells-Riley model
DC.description	Yoshihara J., Yamanaka T., Choi N., et al. Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation. Building and Environment 265, 111911 (2024); https://doi.org/10.1016/j.buildenv.2024.111911.
DCTERMS.abstract	This study proposes using a local exhaust ventilation system (LEV) to prevent airborne infections, especially for short-range conversations. We compared the performance of a hood in three different underfloor air distribution systems (UFAD): floor-supply displacement ventilation (FSDV), horizontal flow-type floor diffuser (HFD), and swirling flow-type floor diffuser (SFD). Two situations were considered: Case A, a consulting room, and Case B, a restaurant or meeting room. The difference in infection risk assessment between using CO2 and artificial saliva particles as tracers of exhaled breath was also discussed. Results indicate that the distribution of exhaled air and infection risk for doctors decreased in the order FSDV < HFD < SFD. Although the effect of introducing hoods was confirmed to a certain degree for the three ventilation methods in Case A, the effect of the hoods on the quanta concentration of the facing person was small in Case B. Comparing airborne infection risks between gas and particles, particle-based airborne infection was smaller in the FSDV due to the more significant impact of particle adhesion and falling. As a limitation, the ventilation rate in the experiment was 1000 m3/h (50 ACH). Therefore, the air supply method had a more significant impact on the results than the hood method. A practical implication of this experiment is that even under high ventilation volumes (50 ACH), the FSDV can reduce the horizontal distribution of the patient's exhaled air and prevent airborne infection. These results should be adapted to smaller spaces such as examination rooms and meeting rooms.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	98322
citation_title	Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation
citation_author	Yoshihara, Jun
	Yamanaka, Toshio
	Choi, Narae
	Kobayashi, Tomohiro
	Kobayashi, Noriaki
	Fujiwara, Aoi
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2024-11-01
citation_journal_title	Building and Environment
citation_volume	265
citation_firstpage	111911
citation_doi	https://doi.org/10.1016/j.buildenv.2024.111911
citation_public_url	https://hdl.handle.net/11094/98322

Infection-prevention performance of local exhaust ventilation under three different underfloor air distribution systems during a face-to-face conversation

閲覧可能ファイル

論文情報

論文詳細を表示