ABSTRACT
The objective of this research is to evaluate the performance of natural ventilation systems in school buildings and to perform the experimental measurements in order to analyze possible ways for indoor air quality improvement respecting energy in the schools. Several types of air distribution were selected for presented experiment within the frame of conventional mixing ventilation system and existing natural ventilation system. The distribution systems were installed in naturally ventilated school building in identical classrooms. The carbon dioxide concentrations were studied under indoor climate parameters (temperature, relative humidity and air movement). Three different categories of indoor environment are specified for indoor ventilated spaces. The category I correspond to a high level of expectation and lead to a highest percentage of satisfied occupants in respect of indoor environment, category II a medium level of expectation and category III to a moderate level of expectation. The designer may also select different levels using the same principles related with specific thermal loss.
