| Title |
Evaluation of CO2 Sensor Placement in a Modular School Classroom using CFD Analysis of CO2 Concentration and Age of Air |
| Authors |
박정안(Park, Jeongan) ; 오인수(Oh, Insoo) ; 박병용(Park, Beungyong) ; 오원석(Oh, Wonseok) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.4.285 |
| Keywords |
Indoor air quality; CO2 sensor; Ventilation; Computational Fluid Dynamics; Modular school building |
| Abstract |
This study evaluates the representativeness of indoor CO2 sensor locations in modular school classrooms using numerical simulations. Spatial
distributions of indoor CO2 concentration and age of air were analyzed under different occupancy and ventilation conditions. The results
indicate that localized areas of high CO2 concentration form depending on ventilation rate and occupancy, demonstrating spatial non-uniformity
in indoor CO2 distribution. To identify a sensor location that best represents the indoor average CO2 concentration, normalized CO2
concentration was used to quantitatively assess location-dependent representativeness. The analysis shows that the CO2 concentration at exhaust
area two most consistently reflects the indoor average across all cases. In addition, the age of air distribution near this location remains
relatively low, indicating continuous air exchange without significant local stagnation. These findings suggest that combining CO2
concentration and age of air provides a more reliable basis for evaluating ventilation performance and selecting indoor CO2 sensor locations.
The results offer practical guidance for sensor placement and ventilation assessment in modular classrooms with repetitive spatial layouts. |