A NUMERICAL AND EXPERIMENTAL STUDY OF THE EFFECT OF USING PERSONAL VENTILATION SYSTEMS ON INDOOR AIR QUALITY IN OFFICE ROOMS

In this study, indoor air quality and thermal comfort were investigated for two persons sitting inside an office room of dimensions (3 x 2.5 x 2.5m). The office room is equipped with personal ventilation systems positioned 50 cm from the person's face. These systems are characterized by the ability to change the rates of airflow (ATD). Experimental studies and results were conducted on a thermal manikin that simulates the human body in a sitting position, and the results are compared with CFD analysis using the k-epsilon and the RNG turbulent models. The experimental study focused on measuring the speed and temperature of the air in different areas inside the room, as well as measuring it around the thermal manikin and in the breathing zone. In the numerical analysis, the thermal comfort and the indoor air quality and the detailed airflow around the occupants Were evaluated using CFD analysis. It has been found that the use of personal ventilation systems increases thermal comfort and indoor air quality. It was found that by maintaining the temperature of the supply air from the personal ventilation system and increasing the speed of the air supply, this leads to a decrease in the temperature of the breathing air, an increase in the quality of the inhaled air, as well as a lowering of the person's temperature.