Exposure to Metabolic CO2 in a Room with Mixing Air Distribution

Tereza Snaselova, Mariya Bivolarova, Detelin G. Markov, Arsen Melikov

    Research output: Contribution to conferencePaperResearchpeer-review


    In the current practice CO2 is used as an indicator of exposure to indoor pollutants. Complete mixing of room air is assumed with mixing air distribution. Under this assumption, the representative CO2 concentration used to assess the indoor air quality and/or to control the ventilation system is measured in the exhaust air or on the walls. However, factors like air flow interaction or pollution source strength and distribution in the space affect the CO2 concentration field in a room. Consequently, this has an impact on occupants’ exposure to pollution. In this study, the impact of heat load distribution, number and location of diffusers, and distribution of occupants on the CO2 exposure was studied experimentally. The experiments were conducted in a climate chamber. Seven persons and a breathing thermal manikin were the source of metabolic CO2 in the room. The CO2 concentration in the air inhaled by the manikin was measured. The results showed that the excess CO2 concentration in the inhaled air was up to 48% higher than in the exhaust. Hence, the CO2 concentration measured in the exhaust air or at the walls might not be the correct representative for the realistic occupants’ exposure assessment.
    Original languageEnglish
    Publication date2021
    Number of pages4
    Publication statusPublished - 2021
    Event15th ROOMVENT Conference - Online
    Duration: 15 Feb 202117 Feb 2021
    Conference number: 15


    Conference15th ROOMVENT Conference


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