The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation

Chen Zhang; Peter V. Nielsen; Amalie Støvring Flou; Emanda Raudeberg; Jonas Spanggaard; Marie Eske Østergaard Jensen; Villiam Jensen; Martin Frandsen

doi:10.1007/978-981-97-8317-5_2

The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation

Chen Zhang^*, Peter V. Nielsen, Amalie Støvring Flou, Emanda Raudeberg, Jonas Spanggaard, Marie Eske Østergaard Jensen, Villiam Jensen, Martin Frandsen

^*Kontaktforfatter

Publikation: Bidrag til bog/antologi/rapport/konference proceeding › Konferenceartikel i proceeding › Forskning › peer review

Abstract

Ventilation is an important measure in reducing cross-infection risk in the indoor environment. A novel ventilation concept, stratum ventilation, sup-plies fresh air directly to occupants' breathing levels and creates a horizontal air-flow layer, which has potential to provide high ventilation effectiveness com-pared with traditional air distribution system. However, the effectiveness of such system is very sensitive to the operation conditions. This study examines how occupants' relative orientations and positions to inlet diffusers affect thermal comfort and cross-infection risks with stratum ventilation. Full-scale experiments in a test room involved life-size breathing thermal manikins representing source and target individuals. Results showed high draft risk at breathing zones was a drawback of such system. Cross-infection risks were sensitive to relative posi-tions and orientations, with the worst scenario involving face-to-face occupants positioned in front of the inlet diffuser. The inlet air jet accelerated airborne trans-mission and maintained high concentrations in the close proximity.

Originalsprog	Engelsk
Titel	Multiphysics and Multiscale Building Physics : Proceedings of the 9th International Building Physics Conference (IBPC 2024) Volume 4: Indoor Air Quality (IAQ), Lighting and Acoustics
Redaktører	Umberto Berardi
Forlag	Springer
Publikationsdato	2024
Sider	10–15
ISBN (Trykt)	978-981-97-8316-8, 978-981-97-8319-9
ISBN (Elektronisk)	978-981-97-8317-5
DOI	https://doi.org/10.1007/978-981-97-8317-5_2
Status	Udgivet - 2024
Begivenhed	The 9th conference of the International Association of Building Physics - Toronto Metropolitan University, Toronto, Canada Varighed: 25 jul. 2024 → 27 jul. 2024 https://www.ibpc2024.org/

Konference

Konference	The 9th conference of the International Association of Building Physics
Lokation	Toronto Metropolitan University
Land/Område	Canada
By	Toronto
Periode	25/07/2024 → 27/07/2024
Internetadresse	https://www.ibpc2024.org/

Navn	Lecture Notes in Civil Engineering
Vol/bind	LNCE 555
ISSN	2366-2557

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10.1007/978-981-97-8317-5_2

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Citationsformater

Zhang, C., Nielsen, P. V., Flou, A. S., Raudeberg, E., Spanggaard, J., Østergaard Jensen, M. E., Jensen, V., & Frandsen, M. (2024). The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation. I U. Berardi (red.), Multiphysics and Multiscale Building Physics: Proceedings of the 9th International Building Physics Conference (IBPC 2024) Volume 4: Indoor Air Quality (IAQ), Lighting and Acoustics (s. 10–15). Springer. https://doi.org/10.1007/978-981-97-8317-5_2

Zhang, Chen ; Nielsen, Peter V. ; Flou, Amalie Støvring et al. / The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation. Multiphysics and Multiscale Building Physics: Proceedings of the 9th International Building Physics Conference (IBPC 2024) Volume 4: Indoor Air Quality (IAQ), Lighting and Acoustics. red. / Umberto Berardi. Springer, 2024. s. 10–15 (Lecture Notes in Civil Engineering, Bind LNCE 555).

@inproceedings{2641c7024afe4310bc6fac228e5f9c47,

title = "The effect of occupants{\textquoteright} relative positions on thermal comfort and cross-infection risk with stratum ventilation",

abstract = "Ventilation is an important measure in reducing cross-infection risk in the indoor environment. A novel ventilation concept, stratum ventilation, sup-plies fresh air directly to occupants' breathing levels and creates a horizontal air-flow layer, which has potential to provide high ventilation effectiveness com-pared with traditional air distribution system. However, the effectiveness of such system is very sensitive to the operation conditions. This study examines how occupants' relative orientations and positions to inlet diffusers affect thermal comfort and cross-infection risks with stratum ventilation. Full-scale experiments in a test room involved life-size breathing thermal manikins representing source and target individuals. Results showed high draft risk at breathing zones was a drawback of such system. Cross-infection risks were sensitive to relative posi-tions and orientations, with the worst scenario involving face-to-face occupants positioned in front of the inlet diffuser. The inlet air jet accelerated airborne trans-mission and maintained high concentrations in the close proximity.",

keywords = "Airborne transmission, Stratum ventilation, Cross-infection, Ther-mal comfort, Air distribution",

author = "Chen Zhang and Nielsen, {Peter V.} and Flou, {Amalie St{\o}vring} and Emanda Raudeberg and Jonas Spanggaard and {{\O}stergaard Jensen}, {Marie Eske} and Villiam Jensen and Martin Frandsen",

year = "2024",

doi = "10.1007/978-981-97-8317-5_2",

language = "English",

isbn = "978-981-97-8316-8",

series = "Lecture Notes in Civil Engineering",

publisher = "Springer",

pages = "10–15",

editor = "Umberto Berardi",

booktitle = "Multiphysics and Multiscale Building Physics",

address = "Germany",

note = "The 9th conference of the International Association of Building Physics ; Conference date: 25-07-2024 Through 27-07-2024",

url = "https://www.ibpc2024.org/",

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Zhang, C , Nielsen, PV, Flou, AS, Raudeberg, E, Spanggaard, J, Østergaard Jensen, ME, Jensen, V & Frandsen, M 2024, The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation. i U Berardi (red.), Multiphysics and Multiscale Building Physics: Proceedings of the 9th International Building Physics Conference (IBPC 2024) Volume 4: Indoor Air Quality (IAQ), Lighting and Acoustics. Springer, Lecture Notes in Civil Engineering, bind LNCE 555, s. 10–15, The 9th conference of the International Association of Building Physics, Toronto, Canada, 25/07/2024. https://doi.org/10.1007/978-981-97-8317-5_2

The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation. / Zhang, Chen ; Nielsen, Peter V.; Flou, Amalie Støvring et al.
Multiphysics and Multiscale Building Physics: Proceedings of the 9th International Building Physics Conference (IBPC 2024) Volume 4: Indoor Air Quality (IAQ), Lighting and Acoustics. red. / Umberto Berardi. Springer, 2024. s. 10–15 (Lecture Notes in Civil Engineering, Bind LNCE 555).

Publikation: Bidrag til bog/antologi/rapport/konference proceeding › Konferenceartikel i proceeding › Forskning › peer review

TY - GEN

T1 - The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation

AU - Zhang, Chen

AU - Nielsen, Peter V.

AU - Flou, Amalie Støvring

AU - Raudeberg, Emanda

AU - Spanggaard, Jonas

AU - Østergaard Jensen, Marie Eske

AU - Jensen, Villiam

AU - Frandsen, Martin

PY - 2024

Y1 - 2024

N2 - Ventilation is an important measure in reducing cross-infection risk in the indoor environment. A novel ventilation concept, stratum ventilation, sup-plies fresh air directly to occupants' breathing levels and creates a horizontal air-flow layer, which has potential to provide high ventilation effectiveness com-pared with traditional air distribution system. However, the effectiveness of such system is very sensitive to the operation conditions. This study examines how occupants' relative orientations and positions to inlet diffusers affect thermal comfort and cross-infection risks with stratum ventilation. Full-scale experiments in a test room involved life-size breathing thermal manikins representing source and target individuals. Results showed high draft risk at breathing zones was a drawback of such system. Cross-infection risks were sensitive to relative posi-tions and orientations, with the worst scenario involving face-to-face occupants positioned in front of the inlet diffuser. The inlet air jet accelerated airborne trans-mission and maintained high concentrations in the close proximity.

AB - Ventilation is an important measure in reducing cross-infection risk in the indoor environment. A novel ventilation concept, stratum ventilation, sup-plies fresh air directly to occupants' breathing levels and creates a horizontal air-flow layer, which has potential to provide high ventilation effectiveness com-pared with traditional air distribution system. However, the effectiveness of such system is very sensitive to the operation conditions. This study examines how occupants' relative orientations and positions to inlet diffusers affect thermal comfort and cross-infection risks with stratum ventilation. Full-scale experiments in a test room involved life-size breathing thermal manikins representing source and target individuals. Results showed high draft risk at breathing zones was a drawback of such system. Cross-infection risks were sensitive to relative posi-tions and orientations, with the worst scenario involving face-to-face occupants positioned in front of the inlet diffuser. The inlet air jet accelerated airborne trans-mission and maintained high concentrations in the close proximity.

KW - Airborne transmission

KW - Stratum ventilation

KW - Cross-infection

KW - Ther-mal comfort

KW - Air distribution

U2 - 10.1007/978-981-97-8317-5_2

DO - 10.1007/978-981-97-8317-5_2

M3 - Article in proceeding

SN - 978-981-97-8316-8

SN - 978-981-97-8319-9

T3 - Lecture Notes in Civil Engineering

SP - 10

EP - 15

BT - Multiphysics and Multiscale Building Physics

A2 - Berardi, Umberto

PB - Springer

T2 - The 9th conference of the International Association of Building Physics

Y2 - 25 July 2024 through 27 July 2024

ER -

Zhang C , Nielsen PV, Flou AS, Raudeberg E, Spanggaard J, Østergaard Jensen ME et al. The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation. I Berardi U, red., Multiphysics and Multiscale Building Physics: Proceedings of the 9th International Building Physics Conference (IBPC 2024) Volume 4: Indoor Air Quality (IAQ), Lighting and Acoustics. Springer. 2024. s. 10–15. (Lecture Notes in Civil Engineering, Bind LNCE 555). doi: 10.1007/978-981-97-8317-5_2

The effect of occupants’ relative positions on thermal comfort and cross-infection risk with stratum ventilation

Abstract

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