The weather is getting hotter and hotter, so pay attention to these aspects when blowing air conditioners during the epidemic period!

With the May Day heat wave, the climate in most parts of the country has gradually turned hot, and midsummer has been staged in many places in recent days.

During the epidemic, whether the air conditioner can be turned on in the office and at home has become a topic of concern to everyone.

What kind of air conditioner may have spread risk?

What are the precautions when using air conditioning?

A few days ago, the reporter interviewed disease control experts and property engineers respectively, and popularized a series of problems in the use of air conditioners.

Prevent the use of air conditioners from causing

Aerosol propagation in a closed environment

Deng Haiyan, chief physician of the Department of Respiratory Medicine of Shenzhen Second People's Hospital, said in an interview that COVID-19 is an infectious disease, and its prevention and control principles are the same as those of ordinary infectious diseases. The prevention and control of infectious diseases mainly includes three aspects: controlling the source of infection, cutting off the route of transmission and protecting the susceptible population.

The transmission routes in COVID-19 mainly include droplet transmission and contact transmission. In a relatively closed environment, long-term exposure may lead to aerosol transmission and fecal transmission.

From the perspective of personal protection, she said, it is necessary to cut off the route of transmission, including avoiding crowds, keeping a proper social distance, wearing masks when going out, washing hands frequently, rubbing eyes, ears, nose and mouth without hands, and opening windows frequently in the office and at home for ventilation.

From the point of view of protecting susceptible people, because people are generally susceptible, citizens need to strengthen their physical fitness, exercise properly, increase protein's intake, keep food diversified, and avoid nutritional deficiency, malnutrition and obesity. Treat its original basic diseases, so that the functions of important organs are in the normal range. Maintain emotional stability, be happy, ensure sleep and enhance immunity.

Deng Haiyan said that with the arrival of summer, the main problem of air conditioning prevention and control in COVID-19 is the virus transmission of aerosol in a closed environment. There is no problem with the normal use of household air conditioners, but it is necessary to ensure regular indoor ventilation, proper temperature and cleaning and disinfection of air conditioners. The use of public places, if the office staff is fixed, the principle of use is similar to that at home.

She also reminded the public that if they don't know much about the safe use of household air conditioners or office air conditioners, it is recommended to consult the property, air conditioner manufacturers or relevant management parties before turning on the air conditioners.

Different air conditioning types should take corresponding measures.

She Yong, chief engineer of Vanke Property and dtz Joint Venture Company, analyzed the central air conditioning of some buildings in Shenzhen as an example, and put forward some suggestions for use. He said that before turning on the central air conditioner in public places, we must first find out the types of air conditioners and take corresponding measures.

According to reports, the use of central air conditioning is generally divided into three categories:

If it is an all-air system, the staff should close the return air valve and run in a brand-new air mode.

If the air conditioning system is fan-coil plus fresh air system, the staff should stop the pipe opener and turn on the new fan to ensure that the fresh air is taken directly from the outdoor without pollution. It is forbidden to take air from engine room, corridor and ceiling. At the same time, the staff should ensure the normal operation of the exhaust system. For rooms with large depth, measures should be taken to ensure ventilation in the internal area.

If the air conditioning ventilation system is a fan-coil system without fresh air, similar to household split air conditioning, there is no fresh air sent into the room, and the air blown out of the air conditioning outlet comes from indoor air. However, the air of this air conditioner circulates in this room and can be used, but it can't replace opening the window for ventilation every day. Open the window whether the air conditioner is on or not.

Regarding whether the office can turn on the air conditioner, She Yong said that the central air conditioners used in the office are mostly fan-coil air conditioners and multi-online air conditioners. Fan coil units and multi-connected units are essentially the same as ordinary split air conditioners, and each room has an indoor unit (unit). Therefore, the air in this room is ventilated and will not cause cross-contamination between rooms. Turning on the air conditioner will not increase the number of viruses in the room.

At the same time, open the fresh air system to dilute the virus that may appear in the room. He said, so you can turn on the air conditioner. In addition, try to open doors and windows to ensure indoor air circulation. Using intermittent window opening, it is recommended to ventilate at least 2-3 times a day for at least 30 minutes each time.

The use of central air conditioning ventilation system is limited to fresh air operation, or air purification and disinfection devices can ensure effective operation, or can ensure independent ventilation in each room. The central air conditioning ventilation system can continue to operate, and the fresh air volume should be increased during operation to increase the indoor air exchange times. Do a good job of cleaning and disinfecting the tuyere and filter screen.

"During the epidemic, we ensured the safety of users by changing the air conditioning boot mode and increasing the disinfection frequency of equipment. I also stopped using the circulating machine in the office building and tried to use outdoor air.

At the same time, we change the cleaning frequency of the main engine room to once a week, including the cleaning of the filter screen and surface cooler of the new fan. After the cleaning work is completed, we will also use low-concentration 84 disinfectant, or use neutral or weakly alkaline disinfectant for disinfection and sterilization. "

He told reporters that there are many people in public places and the traffic is large. In addition to strengthening the cleaning and disinfection of central air-conditioning equipment, we should also pay attention to taking comprehensive management measures, such as wearing masks, keeping a distance from people and registering personnel information. "Once suspected and confirmed cases in COVID-19 are found, the air conditioning and ventilation system should be stopped immediately."