Impact of room airflow interaction on metabolic CO2 exposure

Athanasia Keli*, Arsen K. Melikov, Mariya P. Bivolarova, Panu Mustakallio

*Corresponding author for this work

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CFD simulations were performed to investigate occupants’ exposure to metabolic CO2 in a room with mechanical ventilation. A meeting room occupied by six adult people performing sedentary activity was simulated. Five of the six occupants were simulated to exhale air with realistic CO2 content, while one occupant was inhaling, i.e. the exposed occupant. Both exhalation and inhalation were simulated with constant flow rates. Two air distribution patterns were considered, mixing and displacement air distribution, each was combined with chilled ceiling, as summer conditions were simulated. For both air distribution patterns, the influence of solar gain of 200 W, which was simulated as heated vertical surface (window), and the distance between the occupants facing each other were studied. The simulation results revealed the importance of buoyancy flows generated by heated vertical surfaces for the pollution distribution. It was found out that compared to the case without solar heat gain, the presence of solar gain increased the inhaled CO2 level by 26.9 % in the case of displacement ventilation, while it reduced the exposure by 4.5 % when the outdoor air was distributed by mixing ventilation. The distance between the occupants facing each other did not affect considerably the exposure.
Original languageEnglish
Article number02005
JournalE3S Web of Conferences
Number of pages8
Publication statusPublished - 2019
EventClima 2019: 13th REHVA World Congress - Bucharest, Romania
Duration: 26 May 201929 May 2019
Conference number: 13


ConferenceClima 2019: 13th REHVA World Congress

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