STUDY ON THE DISTRIBUTION OF CARBON DIOXIDE FROM BREATHES IN DENSELY POPULATED INDOOR SPACES

초록

The carbon dioxide (CO2) concentration of densely populated indoor spaces often exceeds the recommended level of 1,000 ppm. Because high concentration of CO2 causes dizziness, headache, and the lack of concentration, it is important to keep low CO2 of classroom and library is important. The averaged CO2 concentration in these indoor spaces have been frequently reported, but the distribution of CO2 in indoor space has been hardly reported. In this study, CO2 concentrations of 10 different points in one indoor space were monitored to see how CO2 exhaled from breathes of people moves in the space. 5 CO2 sensors were placed at the bottom and the others were placed at the ceiling of the room to investigate the effect of height. The results showed that CO2 concentration was higher at the ceiling than at the bottom due to the movement of warm breathing air to the ceiling. CO2 near the ceiling moves toward wall, and the air was cooled down to move to the bottom due to the heavier molecular weight of CO2 than the air. This study will be used for the modeling of CO2 movement in indoor spaces to elucidate the diffusion route of CO2.