Numerical study on the carbon dioxide distribution in a naturally ventilated space

Carbon dioxide concentration is often taken as an indicator of indoor air quality, especially in spaces where human beings are the main contaminant source. Therefore this CFD analysis focuses on the CO2 dis-tribution in a sports hall, representing large and high enclosures. A buoyancy driven natural ventilation sys-tem prevails in the absence of wind, so that a pol-lutant stratification can be expected corresponding to displacement ventilation. The results of a parametric study reveal that the most influencing factors on the vertical carbon dioxide concentration profiles in the space, in addition to the ventilation flow rate, are the thermal properties of the surrounding surfaces.