Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation

Yoshihara, Jun; Yamanaka, Toshio; Kobayashi, Tomohiro; Yamasawa, Haruna; Kobayashi, Noriaki; Nagata, Hisako; Okamoto, Shigeru

doi:https://doi.org/10.1016/j.buildenv.2026.114360

Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation

Yoshihara, Jun; Yamanaka, Toshio; Kobayashi, Tomohiro et al.

Building and Environment, 2026, 294, 114360

アクセス数:24件（2026-05-25 02:56 集計）

固定URL: https://hdl.handle.net/11094/104608

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タイトル	Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation
著者	ORCID 0009-0005-8013-8038 0009-0005-8013-8038 Scopus Author ID 58483146000 58483146000 著者名 Yoshihara, Jun
	NRID 1000080182575 1000080182575 ORCID 0000-0002-7660-1609 0000-0002-7660-1609 researchmap permalink read0014081 read0014081 Scopus Author ID 7402162289 7402162289 著者名 Yamanaka, Toshio
	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 1000080982305 1000080982305 ORCID 0000-0002-1262-8781 0000-0002-1262-8781 researchmap permalink yamasaswa_haruna yamasaswa_haruna Scopus Author ID 57221740075 57221740075 著者名 Yamasawa, Haruna
	NRID 1000060880656 1000060880656 researchmap permalink kobayashi-noriaki kobayashi-noriaki 著者名 Kobayashi, Noriaki
	著者名 Nagata, Hisako
	著者名 Okamoto, Shigeru
キーワード等	Air-permeable carpet
	Airflow-induced particle resuspension
	Circular ceiling diffuser (Anemostat diffuser)
	Floor-supply displacement ventilation (FSDV)
	Infection control
内容	Yoshihara J., Yamanaka T., Kobayashi T., et al. Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation. Building and Environment 294, 114360 (2026); https://doi.org/10.1016/j.buildenv.2026.114360.
抄録	Application of floor-supply displacement ventilation (FSDV) in medical facilities remains limited due to concerns about particle resuspension, including infectious droplets and dust from shoes. However, research data on this phenomenon under FSDV airflow are scarce. This study aimed to quantitatively evaluate particle resuspension under FSDV conditions and compare it with a circular ceiling diffuser (CCD) system. Experiments were conducted in a cleanroom chamber. For FSDV, the floor supply velocity (vf = 0.040, 0.030, and 0.010 m/s) and relative humidity (20%, 50%, and 80%) were varied. For CCD, the airflow rate (850, 750, and 250 m³/h) was varied at 50% relative humidity. Particle concentrations were measured using particle counters to calculate resuspension rates. Microscopic observations of carpet fibers above perforations were also performed to assess microscale resuspension behavior. Both supply velocity and humidity significantly affected resuspension under FSDV. The resuspension rate ranged from 10⁻⁷–10⁻⁴ h⁻¹ (vf = 0.040 m/s, 50 ACH) and 10⁻⁸–10⁻⁵ h⁻¹ (vf = 0.010 m/s, 12 ACH), showing that higher velocity and lower humidity enhanced resuspension. The resuspension rate increased with particle size, and large agglomerates (>10 μm) observed microscopically were more likely to detach due to greater exposed surface area to upward airflow. Under CCD, rates ranged from 10⁻⁵–10⁻³ h⁻¹ for 0.3–3 μm particles but were near zero for ≥10 μm. Airflow-induced resuspension under FSDV was smaller than that reported for walking-induced resuspension, even under high air exchange rates. This indicates that FSDV does not inherently increase resuspension risk under the tested conditions.
出版者	Elsevier Ltd
収録物名	Building and Environment
巻(号)	294
ページ	114360
刊行年月	2026-02-22
言語	英語
ハンドルURL	https://hdl.handle.net/11094/104608
PISSN	03601323
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.buildenv.2026.114360
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
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Building and Environment. 2026, 294, p. 114360
DC.title	Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation
DC.creator	Yoshihara, Jun
	Yamanaka, Toshio
	Kobayashi, Tomohiro
	Yamasawa, Haruna
	Kobayashi, Noriaki
	Nagata, Hisako
	Okamoto, Shigeru
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2026-02-22
DC.identifier	https://doi.org/10.1016/j.buildenv.2026.114360
DC.subject	Air-permeable carpet
	Airflow-induced particle resuspension
	Circular ceiling diffuser (Anemostat diffuser)
	Floor-supply displacement ventilation (FSDV)
	Infection control
DC.description	Yoshihara J., Yamanaka T., Kobayashi T., et al. Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation. Building and Environment 294, 114360 (2026); https://doi.org/10.1016/j.buildenv.2026.114360.
DCTERMS.abstract	Application of floor-supply displacement ventilation (FSDV) in medical facilities remains limited due to concerns about particle resuspension, including infectious droplets and dust from shoes. However, research data on this phenomenon under FSDV airflow are scarce. This study aimed to quantitatively evaluate particle resuspension under FSDV conditions and compare it with a circular ceiling diffuser (CCD) system. Experiments were conducted in a cleanroom chamber. For FSDV, the floor supply velocity (vf = 0.040, 0.030, and 0.010 m/s) and relative humidity (20%, 50%, and 80%) were varied. For CCD, the airflow rate (850, 750, and 250 m³/h) was varied at 50% relative humidity. Particle concentrations were measured using particle counters to calculate resuspension rates. Microscopic observations of carpet fibers above perforations were also performed to assess microscale resuspension behavior. Both supply velocity and humidity significantly affected resuspension under FSDV. The resuspension rate ranged from 10⁻⁷–10⁻⁴ h⁻¹ (vf = 0.040 m/s, 50 ACH) and 10⁻⁸–10⁻⁵ h⁻¹ (vf = 0.010 m/s, 12 ACH), showing that higher velocity and lower humidity enhanced resuspension. The resuspension rate increased with particle size, and large agglomerates (>10 μm) observed microscopically were more likely to detach due to greater exposed surface area to upward airflow. Under CCD, rates ranged from 10⁻⁵–10⁻³ h⁻¹ for 0.3–3 μm particles but were near zero for ≥10 μm. Airflow-induced resuspension under FSDV was smaller than that reported for walking-induced resuspension, even under high air exchange rates. This indicates that FSDV does not inherently increase resuspension risk under the tested conditions.
DC.rights	This article is licensed under a Creative Commons Attribution 4.0 International License.
DC.format	104608
citation_title	Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation
citation_author	Yoshihara, Jun
	Yamanaka, Toshio
	Kobayashi, Tomohiro
	Yamasawa, Haruna
	Kobayashi, Noriaki
	Nagata, Hisako
	Okamoto, Shigeru
citation_publisher	Elsevier Ltd
citation_language	英語
citation_date	2026-02-22
citation_journal_title	Building and Environment
citation_volume	294
citation_firstpage	114360
citation_doi	https://doi.org/10.1016/j.buildenv.2026.114360
citation_public_url	https://hdl.handle.net/11094/104608

Experimental study on airflow-induced particle resuspension from carpet under floor-supply displacement ventilation

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