E3S Web Conf.
Volume 111, 2019CLIMA 2019 Congress
|Number of page(s)||5|
|Section||Advanced HVAC&R&S Technology|
|Published online||13 August 2019|
Airborne transmission during short-term events under stratum ventilation
1 International Center for Indoor Environment and Energy, Department of Civil Engineering, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
2 Department of Architecture, Waseda University, 168-8555, Shinjuku-ku Okubo, Japan
* Corresponding author: email@example.com
Past studies on airborne spread of expiratory droplet nuclei between occupants were focused on long-term exposure under steady-state conditions. However, exposure during short-term events can be widely found in practice, e.g. medical examination or short meeting. Airborne transmission during short-term events under stratum ventilation was examined experimentally in this study. Two breathing thermal manikins were employed to simulate a standing infected person and a standing exposed person. The manikins were placed face-to-face and face-to-back to reproduce the exposure conditions with the highest and the lowest risk, respectively. Tracer gas was dosed into the air exhaled by the “infected” manikin to simulate the droplet nuclei. A newly developed average exposure index was used to evaluate the exposure risk. The time-averaged exposure index increases over time, but the increasing rate depends strongly on the duration of exposure time, e.g., the exposure index increases much faster during the first 5 minutes than during the period after 5 minutes. The exposure index during short-term events does not always decrease with the increase of separation distance. These findings imply that the control measures formulated based on steady-state conditions are not necessarily effective to short-term events.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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