: 261-265
Technical University of Kosice, Slovakia, Faculty of Civil Engineering, Institute of Architectural Engineering, Department of Building Facilities

The paper focuses on the natural ventilation research of space through windows. The various ventilation strategies were examined in relation to the number of open windows and ventilation geometry ergo air flow distribution. The numbers of chosen air flow distributions in space are 2. The first air distribution flow presents a simple ventilation distribution with one open window and the second is cross ventilation by 2 windows on opposite sides of the building envelope. The measurements were performed for the purpose of monitoring of carbon dioxide (CO2) concentration decreasing, which is on value level over 1200 ppm, to value level of 500 ppm up to 530ppm in relation to speed of decline, thus a time duration of ventilation. The level of CO2 concentration exceeding the value 1200 ppm represents values, which do not meet Code requirements of European standards STN EN 15251 and STN EN 13779. The considered CO2 concentrations of 500 ppm up to 530 ppm meet first category of European standards STN 15251 and also represent values at about 100 ppm above background outside CO2 concentration. The measurements were performed by using of Testo 435 instrument and took 4 days. The aim of the measurements was to determine the simple but effective strategy of ventilation for the operation of the apartment space and to achieve the Code values of CO2 concentration and thus for the purpose the indoor air quality improving.

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