Abstract
Purpose: The COVID-19 virus has spread rapidly around the world. Recently, many cases of group infection have been reported due to the operation of indoor air conditioners (AC). That is because the use of AC promotes the spread of droplets by increasing the indoor airflow velocity. Therefore, this study aims to analyze the droplet diffusion according to the airflow velocity of the AC. Method: Particle generation experiments were conducted in the laboratory. The following two cases were compared. Case 1: Conventional AC, Case 2: Low velocity AC (<0.15m/s) Result: The experimental result showed that the maximum concentration of PM10 was about 30% lower in Case 2 than in Case 1 during droplet dispersion. In the case of droplets with a large particle size (>5μm), which are highly likely to spread the virus, the maximum concentration of Case 2 was 67% lower than that of Case1. In the comparison of the loss rate, Case 2 showed a higher reduction rate of about 22% to 29% than that of Case 1. As a result, it was confirmed that wind velocity has a large influence on indoor droplet dispersion. Therefore, In summer, when air conditioners are frequently used, it is more effective to use a low velocity AC to prevent the spread of corona virus.
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