The chilled ceiling is a popular hydronic radiant cooling solution used in different type of buildings. It has higher cooling efficiency than traditional total air systems and is easy to maintain [13]. Radiant ceiling cooling provides “cool head and warm feet” environment which is preferred to “warm head and cool feet” environment often created by total volume air systems. Nevertheless, the chilled ceiling requires installation of additional ventilation system to provide fresh air into spaces. Typically chilled ceiling is installed with mixing ventilation. However, it is suggested that displacement ventilation combined with chilled ceiling has increased cooling capacity and may provide environment with high air quality and acceptable thermal comfort conditions [14-18]. Loveday et al. [19] reported that the stratification flow, typical for displacement ventilation, can be disturbed because of chilled ceil.ing use. Air cooled under the ceiling creates downward convection flow, which increases the warm and contaminated upper region. Additionally chilled ceiling cools walls due to increased radiant heat exchange, which can increase downward convection flow near walls, causing transport of pollutants from the mixing contaminated region into the supply air and occupied zone [20]. Reduced chilled ceiling temperature increases the air velocity at height of 0.1 m and 1.1 m indicating mixing in the stratified zone, which can cause additional decrease of the air quality [19].