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Written by: Yuan Shu
2020-05-03 13:08
Last update date: 2020-05-03 13:08The new coronary pneumonia epidemic lasted for several months, and medical staff may be in the frontline. The ventilation system experts of the Department of Architecture and Technology of the City University of Hong Kong have developed a layered ventilation system, which can provide medical staff working in isolation wards with fresh and clean air, which can help reduce the risk of infection with new coronaviruses.
New vents allow medical staff to breathe in fresh air
At present, the mixed ventilation mode commonly used in isolation wards places the air outlet and exhaust vents in the ceiling position, so that the fresh air has not been blown to the people in the room before the "old" air has been mixed. Professor Lin Zhang, Director of the Department of Architectural Science and Technology, has been studying ventilation systems since the outbreak of SARS in 2003. The layered ventilation system he developed places the air outlet and the air outlet in different positions, the air outlet can be placed in the middle of the wall, and the air outlet is placed near the ground, so that the fresh air will not mix with the "old" air .
The newly developed layered ventilation is to set the air outlet in the middle of the wall, and the installation height depends on the use of the room. For example, the ward can be set 1.5 meters above the ground, that is, the average height of the head from the ground when a person stands Allow medical personnel to take full advantage of the height difference between their breathing area and bed patients nearly a meter, inhale fresh air.
Experiments and simulations verify the feasibility of the new ventilation system
The research team used experiments and computational fluid dynamics simulations to verify the feasibility of the layered ventilation strategy applied to the isolation ward ventilation system. The team used different wind and exhaust methods to study the concentration and distribution of indoor droplets after a minute of coughing in the ward, and found that using a layered ventilation system (Figure 2a), the indoor droplet concentration was low, the distribution was relatively uniform, and there was no high concentration The area appears and the effect is ideal. However, with the mixed ventilation system (Figure 2b), the droplet concentration is relatively high, and some walking spaces in the ward are contaminated. The medical staff who stay or pass in this area are at a higher risk of infection.
Lin pointed out that medical personnel are the most frontline personnel for anti-epidemic. In addition to protective equipment, layered ventilation can deliver fresh air and effectively dilute pathogens, which can strengthen the protection of medical personnel and further reduce risks.
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