with corona Is air conditioning prohibited at school? "Ventilation" is important

with corona Is air conditioning prohibited at school? Ventilation is important 21:22 on June 9th

"It seems that air conditioning is prohibited in schools for the time being to prevent corona infections." As the
heat became severe, this tweet came out.
Is there something like that? I interviewed and confirmed.
I also examined the effective ventilation method that is important for using the air conditioner and is also a countermeasure for the new corona.
(Momoko Ariyoshi/Shinsuke Ayuai/Yuki Takuma)

“It looks like it’s prohibited for the time being”

As the days continue to heat up, Twitter is talking about how to use air conditioners at schools that are restarting in various places.
This time around, some people are saying that they cannot turn on the air conditioner to prevent new coronavirus infection.

"In order to prevent corona infection, it seems that air conditioning is prohibited at school for the time being."
"I can not turn on air conditioning for ventilation this year, I am afraid this summer because the school has declared it ..."

Although it is a countermeasure against infection, is it true that the air conditioner is not used in the severe heat? I asked the board of education of the local government that the person who made such a tweet seems to live.

Don't ask "Don't use"

First, the Kumamoto City Board of Education.
"I don't ask each school to use the air conditioner to prevent infections," he replied. "When I operate the air conditioner, I also notify them to ventilate as much as possible," he said.
In addition, I also asked the Aichi Prefectural Board of Education to say, "I ask you to ventilate the air conditioner when you use it."
As far as I heard from the two boards of education, there seems to be no ban on the use of air conditioners.

Ministry of Education, Culture, Sports, Science and Technology “Ventilation is necessary”

So I checked with the Ministry of Education, Culture, Sports, Science and Technology.
Then, they answered that they did not restrict the use of air conditioners in school classrooms on the premise of "proper ventilation".

According to the Ministry of Education, Culture, Sports, Science and Technology's May 22 statement, "The Hygiene Management Manual for New Coronavirus Infection in Schools-"New School Lifestyle"-" states, "Ventilation is necessary even when using air conditioners." Ventilation should be carried out at all times as much as possible due to the climate, and when it is difficult (at least once every 30 minutes, for a few minutes, fully open the window) and open the windows in two directions at the same time." Even the concrete ventilation method when using the air conditioner was shown.
It is important to use the air conditioner properly to prevent heat stroke.

Research results showing the importance of ventilation

On the other hand, as the fight against the new coronavirus continues, a study showing the importance of ventilation when using an air conditioner has been published.
It was announced by the US CDC = Disease Control Center. The report was conducted by the health authorities in Guangzhou, China, which investigated the transmission routes of three families, 10 in total, who were confirmed to have been infected between January and February.

All 10 were eating at the same restaurant on January 24th, and the three families were dining at different tables. There is no window at that place. The three sets of tables are lined up in a row as seen from the air conditioner outlet.

Sitting in the center were five people who had no symptoms at the time and subsequently developed.
According to the report, the flight of the person at the table in the center was carried down the lee of the air conditioner, and the family at the next table was infected.

In addition, the airflow bounces off the walls.

Therefore, he concluded that this time the infection was thought to have spread to the family on the windward table.
There are no windows and the tables are separated by 1 meter.
From the research results, it can be said that the flight of the air from the air conditioner spread the infection.
In order to prevent the spread of the virus, the report calls for adequate "ventilation" with the tables spaced apart.

“Effective ventilation”

Ventilation can be expected to remove or dilute pollutants such as viruses.
We asked Daikin Industries, a major air conditioning equipment company, about the efficient method.
Before that, the first thing you should know is that "most air conditioners just circulate the indoor air and cannot ventilate". There seems to be a misunderstanding that it is taking in the outside air, but in reality it circulates the indoor air to create cold air.

Daikin Industries is calling for proper ventilation even when using air conditioners, and an effective method is introduced on its website.
First, use ventilation equipment properly such as a ventilation port and a 24-hour ventilation system. And what is important is the frequency of ventilation.

More subdivided together

Ventilation performed by opening the window is about 10 minutes per hour as a guide, and it seems that it is more effective to divide it into 2 times and 5 minutes each time rather than 10 minutes once.

Open diagonally

When opening the window, it is efficient to open the two locations on the diagonal so that the air passage can be created.

The wind is small and big

If the wind is difficult to enter, reduce the size of the wind entrance to force the entry. Basically, the entrance is small and the exit is large.

But what if you have only one window or a room without windows?
It means that you can ventilate by opening the door or using a fan or a ventilation fan.

If you don't have a window, use a fan or something like that.
At schools, we encourage people to ventilate as often as they do at home.

Tips for suppressing electricity bills

In addition, the person in charge of "Daikin Industries" taught me two tips for ventilating while suppressing the power consumption of the air conditioner.

(1) The air conditioner consumes the most power when the power is turned on, so open the window while operating. At that time, it is advisable to raise the set temperature of the air conditioner a little.

(2) When you come home or work in the office, you can save power consumption by opening the closed windows and ventilating before turning on the air conditioner.

The air conditioner is effective to prevent heat stroke as the heat gets severe.
Ventilation is now important to prevent both heat stroke and infection.