Abstract
By simulating the conditions of bed-ridden patients in a biological clean room, the conditions of the airflows that are assumed to occur around patients when horizontal commutation aseptic laminar flow units are operated at an airflow velocity of 0.3 m/s or 0.5 m/s can be investigated. If there are no patients in the room, the airflows have a higher capability to transfer and remove particles at a wind velocity of 0.5 m/s than that at 0.3 m/s. However, if patients are present in the room, the airflows have a lower air exchange rate at a wind velocity of 0.5 m/s than that at 0.3 m/s (p < 0.05). This was because wakes occurred at the downstream side of patients. Therefore, we conducted experiments whose results suggest that the fluctuation in ventilation conditions would be larger because an increase in the wind velocity increases the size of wakes.
