Efficiency of different ventilation concepts in classrooms

The productivity of occupants in classroomsdepends strongly on the indoor air quality andthe thermal comfort. Three ventilation conceptswith different arrangements of supplyand exhaust openings are presented as solutionsin this study. The different ventilationconcepts which are mixing- and displacementventilation are evaluated by different criteriain particular by their ventilation efficiency. Atypical classrooin with occupants which aredefined as dummies is used as a virtual room.The investigations are realised with full-scalenumerical modelling under ComputationalFluid Dynamics (CFD) method and validatedexperimentally.The results demonstrate on the one side thatthe comparison of experimental and simulationresults show rather good accordance; onthe other side that both concepts satisfy thedemands of thermal comfort and indoor airquality in the occupied zone of the room. Withthe same air change rate the ventilation systemprovides better ventilation efficiency.