Technical research on outdoor air handling units under epidemic situation

In recent years, the output of outdoor air units in China has a burst growth trend and the number of using the outdoor air handling units in houses and schools has greatly increased. The COVID-19 epidemic has accelerated the development of this product. In order to meet the situation, China has issued more than 50 standards, norms and documents about outdoor air handling units and outdoor air systems. But they are independent each other. The outdoor air handling unit can only dilute the pollutants in the building through ventilation, but can not inactivate viruses, kill bacteria, and remove gaseous pollutants and indoor particulate matter. The same parameters are not uniform in different standards, which is not conducive to the implementation of standards. The appellation of the “anti-epidemic outdoor air handling unit” is not standardized and should not be used as bidding equipment. It is suggested to determine the outdoor air rate index of various buildings as soon as possible, including the outdoor air rate index to control the risk of respiratory infection in indoor rooms. It is considered that the successful development of vacuum-based membrane dehumidifier has expanded the application of outdoor air handling units.