Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room

Li Liu, Peter Vilhelm Nielsen, Rasmus Lund Jensen, Chunwen Xu, Yuguo Li

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

Abstract

This study focuses on occupants’ exposure of aerosols exhaled by one susceptible in a full-scale test room. Three breathing thermal manikins are standing in the middle of room and both the process in the microenvironment and in the macroenvironment are considered. A diffusive ceiling has been installed to induce fresh air without generating sensible drafts in an occupied zone with fully mixing flow. The exposures of two target manikins to aerosols exhaled by one susceptible manikin were measured. Tracer gas N2O was used to simulate droplet nuclei. Comparisons on different mutual distances were conducted. It is found that the exposures of target manikins are not close to the results of previous two-manikin studies. During the measurements, dynamic exposures are measured, and fluctuation of targets’ exposures was observed during the experiment. It is found that instant high exposure exists even the average exposure is low. Two symmetrically located target manikins have different exposures of droplet nuclei exhaled by one susceptible manikin. CFD simulations were also conducted to predict the aerosols deposited on the targets’ body surfaces. 3 droplet nuclei were predicted to land on the left target manikin and 4 were found on the right, though 3 of 4 are on the back.
Original languageEnglish
Title of host publicationProceedings of Indoor Air 2014
Number of pages8
PublisherInternational Society of Indoor Air Quality and Climate
Publication date2014
Publication statusPublished - 2014
Event13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014: The 13th International Conference on Indoor Air Quality and Climate - Hong Kong, Hong Kong
Duration: 7 Jul 201412 Jul 2014

Conference

Conference13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014
CountryHong Kong
CityHong Kong
Period07/07/201412/07/2014

Fingerprint

full scale tests
rooms
aerosols
nuclei
draft
ceilings
breathing
charge flow devices
tracers

Keywords

  • Cross infection
  • Aerosol dispersion
  • Breathing and exposure

Cite this

Liu, L., Nielsen, P. V., Jensen, R. L., Xu, C., & Li, Y. (2014). Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room. In Proceedings of Indoor Air 2014 International Society of Indoor Air Quality and Climate.
Liu, Li ; Nielsen, Peter Vilhelm ; Jensen, Rasmus Lund ; Xu, Chunwen ; Li, Yuguo. / Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room. Proceedings of Indoor Air 2014. International Society of Indoor Air Quality and Climate, 2014.
@inproceedings{436e0b5ac2c0463a88070a258d659ac6,
title = "Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room",
abstract = "This study focuses on occupants’ exposure of aerosols exhaled by one susceptible in a full-scale test room. Three breathing thermal manikins are standing in the middle of room and both the process in the microenvironment and in the macroenvironment are considered. A diffusive ceiling has been installed to induce fresh air without generating sensible drafts in an occupied zone with fully mixing flow. The exposures of two target manikins to aerosols exhaled by one susceptible manikin were measured. Tracer gas N2O was used to simulate droplet nuclei. Comparisons on different mutual distances were conducted. It is found that the exposures of target manikins are not close to the results of previous two-manikin studies. During the measurements, dynamic exposures are measured, and fluctuation of targets’ exposures was observed during the experiment. It is found that instant high exposure exists even the average exposure is low. Two symmetrically located target manikins have different exposures of droplet nuclei exhaled by one susceptible manikin. CFD simulations were also conducted to predict the aerosols deposited on the targets’ body surfaces. 3 droplet nuclei were predicted to land on the left target manikin and 4 were found on the right, though 3 of 4 are on the back.",
keywords = "Cross infection, Aerosol dispersion, Breathing and exposure, Cross infection, Aerosol dispersion, Breathing and exposure",
author = "Li Liu and Nielsen, {Peter Vilhelm} and Jensen, {Rasmus Lund} and Chunwen Xu and Yuguo Li",
year = "2014",
language = "English",
booktitle = "Proceedings of Indoor Air 2014",
publisher = "International Society of Indoor Air Quality and Climate",

}

Liu, L, Nielsen, PV, Jensen, RL, Xu, C & Li, Y 2014, Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room. in Proceedings of Indoor Air 2014. International Society of Indoor Air Quality and Climate, 13th International Conference on Indoor Air Quality and Climate, Indoor Air 2014, Hong Kong, Hong Kong, 07/07/2014.

Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room. / Liu, Li; Nielsen, Peter Vilhelm; Jensen, Rasmus Lund; Xu, Chunwen; Li, Yuguo.

Proceedings of Indoor Air 2014. International Society of Indoor Air Quality and Climate, 2014.

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

TY - GEN

T1 - Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room

AU - Liu, Li

AU - Nielsen, Peter Vilhelm

AU - Jensen, Rasmus Lund

AU - Xu, Chunwen

AU - Li, Yuguo

PY - 2014

Y1 - 2014

N2 - This study focuses on occupants’ exposure of aerosols exhaled by one susceptible in a full-scale test room. Three breathing thermal manikins are standing in the middle of room and both the process in the microenvironment and in the macroenvironment are considered. A diffusive ceiling has been installed to induce fresh air without generating sensible drafts in an occupied zone with fully mixing flow. The exposures of two target manikins to aerosols exhaled by one susceptible manikin were measured. Tracer gas N2O was used to simulate droplet nuclei. Comparisons on different mutual distances were conducted. It is found that the exposures of target manikins are not close to the results of previous two-manikin studies. During the measurements, dynamic exposures are measured, and fluctuation of targets’ exposures was observed during the experiment. It is found that instant high exposure exists even the average exposure is low. Two symmetrically located target manikins have different exposures of droplet nuclei exhaled by one susceptible manikin. CFD simulations were also conducted to predict the aerosols deposited on the targets’ body surfaces. 3 droplet nuclei were predicted to land on the left target manikin and 4 were found on the right, though 3 of 4 are on the back.

AB - This study focuses on occupants’ exposure of aerosols exhaled by one susceptible in a full-scale test room. Three breathing thermal manikins are standing in the middle of room and both the process in the microenvironment and in the macroenvironment are considered. A diffusive ceiling has been installed to induce fresh air without generating sensible drafts in an occupied zone with fully mixing flow. The exposures of two target manikins to aerosols exhaled by one susceptible manikin were measured. Tracer gas N2O was used to simulate droplet nuclei. Comparisons on different mutual distances were conducted. It is found that the exposures of target manikins are not close to the results of previous two-manikin studies. During the measurements, dynamic exposures are measured, and fluctuation of targets’ exposures was observed during the experiment. It is found that instant high exposure exists even the average exposure is low. Two symmetrically located target manikins have different exposures of droplet nuclei exhaled by one susceptible manikin. CFD simulations were also conducted to predict the aerosols deposited on the targets’ body surfaces. 3 droplet nuclei were predicted to land on the left target manikin and 4 were found on the right, though 3 of 4 are on the back.

KW - Cross infection

KW - Aerosol dispersion

KW - Breathing and exposure

KW - Cross infection

KW - Aerosol dispersion

KW - Breathing and exposure

UR - http://www.isiaq.org/publications.php

M3 - Article in proceeding

BT - Proceedings of Indoor Air 2014

PB - International Society of Indoor Air Quality and Climate

ER -

Liu L, Nielsen PV, Jensen RL, Xu C, Li Y. Interpersonal Transport of Expiratory Aerosols among Three Manikins in a Full-Scale Test Room. In Proceedings of Indoor Air 2014. International Society of Indoor Air Quality and Climate. 2014