Distribution characteristics of respiratory aerosols in enclosed environments

Naiping Gao, Jianlei Niu, Lidia Morawska

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

Dispersion characteristics of respiratory droplets in indoor environments are important in controlling transmission of airborne diseases indoors. This study investigates the spatial concentration distribution and temporal evolution of exhaled and sneezed/coughed droplets within the range of 1.0-10.0μm in an office room with three air distribution methods, specifically mixing ventilation (MV), displacement ventilation (DV), and under-floor air distribution (UFAD). The simulation results indicate that exhaled droplets with diameters up to 10.0μm from normal respiration process are uniformly distributed in MV. However, they become trapped in the breathing height by thermal stratifications in DV and UFAD, resulting in a high droplet concentration and an increased exposure risk to other occupants. Sneezed/coughed droplets are more slowly diluted in DV/UFAD than in MV. Low air speed in the breathing zone in DV/UFAD can lead to prolonged human exposure to droplets in the breathing zone.
Original languageEnglish
Title of host publicationProceedings - 6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009
Pages811-818
Number of pages8
Volume2
Publication statusPublished - 1 Dec 2009
Event6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009 - Nanjing, China
Duration: 6 Nov 20099 Nov 2009

Conference

Conference6th International Symposium on Heating, Ventilating and Air Conditioning, ISHVAC 2009
CountryChina
CityNanjing
Period6/11/099/11/09

Keywords

  • Airborne disease
  • Displacement ventilation
  • Respiratory droplets
  • Transmission
  • UFAD

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Geography, Planning and Development

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