This project aims to quantitatively investigate
people’s re-inhalation of their own exhaled air and inhalation of air exhaled
from nearby people. Full-scale experiments will be conducted in a climate
chamber ventilated with mixing air distribution. The methods of measuring
concentrations of inhaled and exhaled air of a breathing thermal manikin will
be systematically evaluated and the best method will be recommended. Two
breathing thermal manikins will be used to simulate two seated persons. One of
the manikin will exhale tracer gas N2O and another CO2.
The N2O and CO2 concentrations inhaled by both manikins
will be measured using INNOVA gas monitor and Fast Gas Meter. The influence of
several important influential parameters will be examined, which include
distance between manikins, positioning of body, positioning of head, breathing
mode, supply flow rate, indoor air temperature, desk fan and desk slot.
This project will first establish a method that can
accurately measure concentrations of inhaled and exhaled air of a breathing
manikin and second reveal the fractions of one’s own exhaled air and air
exhaled from nearby people in one’s inhaled air under different conditions. It will
provide fundamental information for indoor ventilation design and for
formulating intervention measures to ensure an acceptable inhaled air quality.
Knowledge in fluid mechanics and heat and mass transfer