INDOOR CLIMATE IN ROOMS WITH COOLED CEILING SYSTEMS

By using thermal dynamic simulation and CFD (computational fluid dynam ics) techniques, thermal comfort and indoor contaminant distributions are analysed for a room with: (1) a conventional displacement ventilat ion system, (2) a cooled ceiling with displacement ventilation system, and (3) a cooled ceiling with ceiling air supply system. The numerica l simulation results indicate that a cooled ceiling reduces the vertic al temperature gradients while still maintaining the ventilation effec tiveness much higher than one at a load of nearly 50 W/m2 floor area. By comparison, maximum cooling capacities of the three systems are dis cussed, specifically in respect to their thermal comfort performances.