Occupants¿ response to individual control of the airflow rate, the direction of the airflow and the positioning of a Personalized Ventilation System (PVS) was studied. Thirty human subjects participated in 3 h 45 min experiments performed in an office set-up with installed mixing ventilation and the PVS. Six desks, each equipped with a PVS, were placed in the office. The PVS allowed each occupant to select his/her preferred position of the air terminal device (ATD), the direction of the air supplied and its flow rate (up to 15 L/s.person). The airflow rate from each PVS was measured and recorded for the whole duration of the experiment. The positioning of the ATD was registered as well. Subjects were exposed to four experimental conditions: PVS supplying outdoor air at: (1) 20°C; (2) 23°C; (3) PVS supplying re-circulated room air; and (4) mixing ventilation, without PVS. The room temperature was kept constant at 23°C and relative humidity at 30%. A total supply of 90 L/s outdoor air was maintained with PVS and mixing ventilation or only with mixing ventilation. Air quality in the low-polluting office space was decreased by a 20-year-old used carpet that was placed behind a screen, so that subjects could not see it. During exposures, subjects performed typical office work. Several times during the experiment they answered questions regarding air quality and SBS symptoms, thermal sensation, draught risk, and reported changes made in the PVS. Results showed that all participants actively made use of the facility provided to control the airflow rate and the position and direction of the ATD. The preferred airflow rate varied from 3 L/s to 15 L/s.person. It was observed that over time, participants tended to change the position of the ATD less frequently. Analysis of the positioning at the end of each experiment revealed that almost one third of the participants chose the same position, but typical for each individual, at least at two out of three experimental conditions with PVS.
|Publication status||Published - 2004|
|Event||Manuel Carlos Gameiro da Silva Roomvent2004 - Coimbra, Portogal|
Duration: 1 Jan 2004 → …
|Conference||Manuel Carlos Gameiro da Silva Roomvent2004|
|Period||01/01/2004 → …|