Breathing zone and exhaled air re-inhalation rate under transient conditions assessed with a computer-simulated person

Kazuki Kuga, Pawel Wargocki, Kazuhide Ito

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The breathing zone of an individual indoors is usually defined as a finite region steadily formed in front of a face. Assuming the steady formation of the breathing zone, we propose a procedure for quantitatively identifying a breathing zone formed in front of a human face in the transient condition. This assumption is reasonable considering that the ventilation time scale of human respiration is sufficiently short compared to the ventilation time scale of a room. We used steady-state computational fluid dynamics (CFD) and a computationally simulated person (CSP). We present the probabilistic size of the breathing zone for various postures and breathing conditions. By analyzing unsteady inhalation and exhalation airflow characteristics via a CSP with a respiratory system, we also estimated the direct re-inhalation rate of the exhaled air. The results can be used for developing methods to control the long-term and low-contaminant concentration exposures.

Original languageEnglish
Article numbere13003
JournalIndoor Air
Volume32
Issue number2
DOIs
Publication statusPublished - Feb 2022

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Building and Construction
  • Public Health, Environmental and Occupational Health

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