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How to do "ventilation" as a new coronavirus countermeasure?


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How to do "ventilation" as a new coronavirus countermeasure?

"Ventilation" is important as a measure against the new type of coronavirus, but "How to actually ventilate?" Is not widely known, and the Architectural Institute of Japan and the Society of Air Conditioning and Sanitary Engineers view Is shown.

Emergency Chairman's Talk on "Ventilation" in Control of New Coronavirus Infections
(PDF file)https://www.aij.or.jp/jpn/databox/2020/200323.pdf

The Ministry of Health, Labor and Welfare announced on March 9, 2020 as a measure against the new coronavirus “(PDF file)New Coronavirus Infection Control MeasuresExamples of situations where the risk of clusters (groups) occurring in daily life are high are “ enclosed spaces with poor ventilation, '' “ densely crowded places, '' and “ close scenes with close conversations and utterances. '' Was

The government stated that ventilation should be enforced: "In a windowed environment, open two-way windows at the same time to encourage ventilation. However, there is still no established evidence of how much ventilation is sufficient. Is not there. " However, it did not show specific ventilation methods in various situations, such as an environment without windows, and was inquired. Therefore, the Architectural Institute of Japan and the Society of Air Conditioning and Sanitary Engineers show "how to ventilate" as follows.

1: Ventilation rate

The word "ventilation twice / hour" is often misunderstood as "opening the window twice an hour", but the number of ventilations is the volume of outside air entering the room (hours) per hour. (Rice) divided bySpeed ​​of air exchangeIs an index that represents The number of ventilations is determined by the size of the inlet and outlet when the air is exchanged, and the size of the room itself. As the number of ventilations increases, the dirty indoor air can be diluted with outside air and replaced more quickly. It is said that more detailed explanations will be provided in the future regarding the ventilation rate.

2: Natural ventilation and mechanical ventilation

Ventilation can be broadly divided into "natural ventilation" in which windows are opened and "mechanical ventilation" using fans. In buildings and vehicles with windows, it is effective to open the windows actively to take in outside air, but in automobiles, etc., it is also effective to set the mode to take in outside air instead of "inside air circulation mode". At this time, it is important to check that the intake and exhaust ports are not blocked.

3: Ventilation in a room without windows

In office buildings, air-conditioning equipment that can ventilate rooms without windows maintains the indoor environment. Introducing outside air will lower the cooling and heating efficiency, but it is possible to take measures such as increasing the amount of outside air intake as long as it does not hinder operations.

Ordinary household air conditioners and packaged air conditioners only circulate air and do not provide ventilation. The air conditioner is turned on, so it is not a problem. It is recommended that you open the window or operate the ventilation system in rooms that only have air conditioner.

4: Air purifier

For general air purifiers, the amount of air passing through is small compared to the amount of ventilation, so it is unknown whether the whole room is sufficiently effective against new coronavirus. Due to the range of air purifiers, it is recommended that regular ventilation be used instead of relying solely on the air purifier.

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