In such rooms, tests are carried out for various biological (Weryszko-Chmielewska et al. In rooms occupied by numbers of people, the quality of the air is extremely important. The level of carbon dioxide in conference rooms has a significant effect on the comfort of the working conditions (Tham 2016). Small conference rooms often have only stack ventilation, which produces a small, constant flow of air in the room.
This is a minimum hygienic requirement recommended by standards (ASHRAE 2006 EN 13779: 20). The permissible concentration of carbon dioxide in closed rooms is 1000 ppm. Conference rooms belong to this category. 2019 Zender-Świercz 2017, 2018).Ĭarbon dioxide is the most powerful predictor in the case of rooms occupied by large numbers of persons (Szczurek et al. Some scientists view the IAQ index as an indicator of the concentration of CO 2 (Khazaei et al. The selected substances are acetaldehyde, acrolein, α-pinene, benzene, carbon dioxide, formaldehyde, naphthalene, nitrogen dioxide, PM10, PM2.5, radon, styrene, toluene, trichloroethylene, TVOC and mould (Salis et al. It is proposed that the model can be applied in the regulation of mechanical ventilation in rooms based on the concentration of carbon dioxide.Ĭontamination of the air within rooms may originate both from the ambient external air penetrating into the interior and directly from internal sources.Ĭontaminants regarded as harmful to health have been identified and selected in the form of a list of contaminants to be taken into account in determining the IAQ index, defined by Salis et al. The model may be applied for the design of systems of automatic regulation in ventilation installations and for analysis of carbon dioxide concentrations in closed rooms used by people. In this work, a simplified comprehensive formula was developed to predict the concentration of carbon dioxide in rooms. The increase in carbon dioxide concentration in rooms of this type is dependent primarily on the volume of the room, the number of people occupying it and the air change rate. In all cases, a linear increase in the level of carbon dioxide was recorded during sessions. The air supply was regulated by unsealing or opening of the windows.
CARBON DIOXIDE FORMULA WINDOWS
Tests were performed with and without prior airing of the room by opening windows before sessions. The experiments were carried out in a conference room in the building of the Faculty of Civil and Environmental Engineering at Białystok University of Technology in Poland.
Based on an experimental study, a simplified model is constructed for the concentration of carbon dioxide in conference rooms with stack ventilation.
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