| Title |
Experimental Assessment of Local Ventilation for Controlling Respiratory Droplet Spread |
| Authors |
박병용(Park, Beungyong) ; 장승민(Jang, Seungmin) ; 조진균(Cho, Jinkyun) |
| DOI |
https://doi.org/10.5659/JAIK.2023.39.11.151 |
| Keywords |
Common Care Room; Virus Transmission; Health Care Work Infection. Local Exhaust Air Flow System; Ventilation Effectiveness; Tracer Gas Method |
| Abstract |
This study aims to establish criteria for designing medical local ventilation purifiers, enhancing safety for healthcare workers treating
suspected, high-risk infectious patients by preventing the spread of airborne infectious bacteria. To achieve this, there were cases and
technological trends investigated of local ventilation purifiers used in medical settings both domestically and internationally. Experiments that
simulated real medical treatment scenarios for healthcare workers were conducted using an industrial hooded local exhaust device. These
experiments assessed the device's ability to remove particles and trace gases. According to the SPS-KACA002-132 standard, in strong wind
operation mode, the device achieved a particle removal capacity of 55.2 % for (0.3±0.1) um-sized particles and 54 % for (0.5±0.1)um-sized
particles. The airflow velocity of the hooded local exhaust system varied with the installation angle, with the highest central air velocity
(0.71 m/s) observed at a 45° installation angle, corresponding to the range of (0.5 ~ 1.0) m/s based on the second stage of ASHRAE
industrial exhaust hoods (a total of 4 stages). The trace gas removal performance was optimal at the 45° installation angle. It's worth noting
that the performance of the local ventilation purification device was evaluated using the spatial unit evaluation method. However, this method
has limitations as it primarily considers local effects. In future studies, additional factors such as noise and vibration should be considered. |