Changes of Carbon Dioxide Concentrations in Classrooms: Simplified Model and Experimental Verification

Abstract

Our paper presents a simplified model of carbon dioxide concentrations in classrooms equipped with stack ventilation systems, based on experimental research. The test was conducted in six classrooms in the building of the Faculty of Civil and Environmental Engineering of Białystok University of Technology in northeastern Poland. The research included both classrooms that were not mechanically ventilated and classrooms that were ventilated by opening the windows during breaks between classes. In all classrooms, a linear increase in the concentration of carbon dioxide during the classes was observed. The increase of the concentration of carbon dioxide in spaces of this type depends mostly on the volume of and the number of persons present in the space.

The concentration of carbon dioxide in conference rooms: a simplified model and experimental verification

“…A previous study (Teleszewski and Gładyszewska-Fiedoruk 2018) has shown that the rate of increase in carbon dioxide levels in a conference room with stack ventilation depends primarily on the number of persons in the room and on the room volume. In the present work, analysis was also made of the dependence of CO 2 concentration on the air change rate.…”

“…Internal environmental parameters were measured in accordance with recommendations given in the literature (Recknagel et al 2006). Measurements were taken with a Testo recorder and IAQ probe, with parameters as described in the publications (Teleszewski and Gładyszewska-Fiedoruk 2018;Krawczyk et al 2018). Probes were positioned at five measurement points situated 1.1 m above floor level, and this was assumed to be the height of a person's head during sessions in the conference room.…”

“…The measurement results were also used to verify the model of Griffiths and Eftekhari (2008) and to compare the two models. In the paper (Teleszewski and Gładyszewska-Fiedoruk 2018), a model was developed to give the carbon dioxide concentration in conference rooms with stack ventilation as a function of time, number of persons present and room volume. This model was accurate for an air change rate of 0.5 h −1 .…”

Examination of PM10 and PM2.5 Concentration in an Apartment in a Multifamily Building

“…High concentrations and long-term exposure to some pollutants cause diseases, and some of the substances, for example carbon dioxide, affect the comfort of work and use of the rooms. Due to this, air exchange rate should be provided to ensure the safety and health of people [5,6].…”

Analysis of indoor air quality in a naturally ventilated church

“…It is characterized as a group of various physical and chemical parameters that change over time within the space of a given room. It is an ecosystem in which elements interact with each other and, at the same time, react with the external environment, which allows for creating appropriate conditions for people [3][4][5][6].…”