How to choose the fresh air system wisdom tiger?

Everyone has heard of the harm of smog to the body. PM2.5 in smog will directly harm the respiratory system and cardiovascular system. The ESCAPE study covered 9 European countries, and the follow-up target was 310.3 million people. After an average of 12.8 years of follow-up, a report was issued, and the conclusion was that the risk of lung cancer increased by 18% for every 5 μ g/m3 increase in PM2.5.

For the sake of health, more and more people improve indoor air quality by cutting off pollution sources and buying purification equipment. However, for most office workers, nearly 1/3 or even half of the day is spent in the office. If the office closes the window to isolate the smog, I am afraid it will cause new health problems.

A study published in Perspective of Environmental Health found that when the concentration of carbon dioxide was 2500 ppm, people's decision-making ability decreased by 44% to 94%. In many crowded office areas, the concentration often reaches 1000 ppm, and sometimes even exceeds 3000 ppm.

Wisdom tiger's troubles

Haze often appears in autumn. I didn't expect a magical company like Zhihu to start worrying about smog pollution. Due to the large number of employees, the indoor CO2 concentration is rising. In order to better discover the world, explore unknown information and have a healthy and good office environment, Zhihu has found an air castle that provides air solutions for educational and commercial institutions such as tsinghua university primary school, Chinese Academy of Sciences Kindergarten and Nanjing University.

In this way, an "air battle" against smog and CO2 began.

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Why choose

Wall mounted fresh air purification system?

Air Fort's air solution for Zhihu is to install wall-mounted fresh air systems in all office areas. The fresh air system can be divided into two types according to the installation method: pipeline type and wall-mounted type. The reason why the wall-mounted type is selected is that the duct fresh air should be installed simultaneously with the house decoration.

Zhihu's office decoration passed, so he chose wall-mounted installation. As long as you open a hole in the wall or window and add an indoor unit similar to a wall-mounted air conditioner in the room, you don't have to fight.

The principle of the wall-mounted fresh air purification system is that outdoor fresh air is sucked into the fresh air blower through a pipe passing through a gap in a wall or a window, purified into clean air through multiple filters in the fresh air blower, and then the clean fresh air is input into the room. At this time, the indoor air pressure is slightly higher than the outdoor air, and the original indoor air will be pushed out of the room as a distributed outlet, thus replacing the original indoor air and realizing the micro-positive pressure circulation of the indoor air, thus continuously delivering pure fresh air to the room and removing it.

Having said so many theories, let's take a look at the "actual combat" of Castle in the air in Zhihu office, just to take this opportunity to show you what the mysterious Zhihu office looks like.

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Zhihu air combat

Actual combat scene

Investigation article

Investigation scheme design is an essential link before the installation of fresh air system, which is very important for the installation and effect of fresh air system, and directly determines the installation mode, quantity and location.

The surveyor of the Castle in the Air is designing the installation scheme for Zhihu.

The number of installations mainly depends on the building area and population, the building area (which determines the demand for fresh air) and the population (which determines the indoor carbon dioxide value).

This time, there are two office areas in Zhihu that need to install fresh air systems. A 500-square-meter, 4-meter-high room with about 70 people. According to the national standard, the average person needs 30 cubic meters of fresh air per hour, and the required total air volume is 2 100 cubic meters per hour. The other office area 1200m2, 3m high, has120 office workers, and needs 3600 cubic meters of fresh air per hour. Considering the ventilation times, office staff, site closure, installation conditions and other factors, we finally decided to install 19 fresh air system.

The choice of installation location needs to comprehensively consider the user's wishes, the usual activity area, the location selection of air outlet and air inlet, etc. In particular, determine whether the outdoor environment with openings meets the air intake conditions, such as the influence of outdoor air conditioning on openings and the influence of outdoor drainage pipes. , whether there is any other shelter on the outdoor wall, whether there is an exhaust port of the range hood, whether the indoor and outdoor wall sizes are consistent, and whether there is an outdoor pollution source. The most important thing is to stay as far away from the smoke outlet of the gas stove as possible. The distance between the air inlet and the smoke outlet should be greater than 1.5 meters, and the air inlet should be more than 3 meters above the smoke outlet, and it must be in an open environment.

Zhihu office fully meets the installation conditions, greatly reducing the difficulty of installation design.