https://doi.org/10.6110/KJACR.2025.37.5.228
Insoo Oh ; Jeongan Park ; Wonseok Oh ; Jinkyun Cho ; Beungyong Park
This study examined the potential of using a ductless, fixed vane air supply type ventilation system as a solution to structural and cost limitations of duct-type systems in aging buildings. The performance of such ductless, fixed vane air supply type ventilation system was evaluated based on air delivery, indoor airflow distribution, and thermal comfort. Measurements showed a turbulence intensity of 4% at the diffuser outlet, with an average velocity of 2.69 m/s and a velocity standard deviation of 0.12 m/s, indicating a stable airflow. Airflow distribution results revealed velocities between 0.05 m/s and 0.3 m/s, providing a stable and imperceptible draft sensation for seated and standing occupants. The system maintained effective air delivery up to 8 m from the diffuser, achieving uniform air distribution throughout the space. Effective Draft Temperature (EDT) analysis confirmed that airflow and temperature variations...