What is the difference between air purifier and fresh air system
Nowadays, air purifiers and fresh air systems have become one of the items purchased by many families. When people consider purchasing air purifiers or fresh air systems, they hope that they can purify indoor air. Indoor air pollutants are mainly suspended particulate matter such as PM2.5, volatile organic pollutants, and microorganisms such as bacteria.
At present, the mainstream filtration technology of air purifiers on the market is mechanical and electrostatic. The mechanical type belongs to passive adsorption filtration. The indoor air is drawn into the air purifier through an exhaust fan, and then the particulate matter and volatile organic matter are filtered through the filter inside the machine. The electrostatic type uses a high-voltage electrostatic field to form a corona. The collision of free electrons and particles attaches to the dust particles, so that the particles are charged and are absorbed by the filter under the force of the electric field.
Common filters mainly include HEPA filters and activated carbon filters. The HEPA filter is made of multi-component glass fiber, which can efficiently capture particles in the air and effectively filter out inhalable particles above 0.3 microns, smoke, bacteria, etc. . The activated carbon filter uses the unique pore structure of activated carbon and the characteristics of a wide range of pore sizes to absorb organic pollutants in the air.
In addition, some air purifiers use silver ion purification, negative ion purification, water washing air, photocatalyst and other technologies, making the air purifier market flourish.
How does the fresh air system work? The fresh air system is an independent air treatment system composed of a supply air system and an exhaust air system. Its basic principle and function is to introduce outdoor air while exhausting indoor air. The effect of ventilation. The fresh air system is equipped with an electrostatic dust collection box or a filter, and it will have the air purification function. In addition, the fresh air system is equipped with a heat exchanger to have a heat exchange function.
It is not difficult for a careful friend to find that the function of an air purifier is to clean the existing air in the room, while the fresh air system realizes indoor and outdoor air circulation through exhaust and air supply ducts, and at the same time purifies the incoming air to achieve total heat exchange. Regardless of whether it is a fresh air system or an air purifier, the use of a filter to purify the air requires regular replacement of the filter. If it is not replaced in time, there will be a risk of secondary pollution.
Therefore, if only starting from the principle of air purification, the air purifier and the fresh air system are the same. Whether it is HEPA filter, activated carbon filter, electrostatic dust collection, silver ion purification, and negative ion purification, they are all realized based on the following principles. : First, use the principle of inertial collision adsorption. After the direction of airflow changes, the pollutant particles will move in a straight line under the influence of inertia, and then be adsorbed by the filter material; second, diffusion adsorption, which is carried out by Brownian motion A kind of adsorption, where particles reach the fiber surface from the airflow, and are directly adsorbed by the fiber under the influence of electrostatic factors, which has a relatively good effect on filtering the gas; third, direct adsorption, which adsorbs and intercepts the substances larger than the filter medium in the particles. The smaller the pore size, the higher the adsorption efficiency and the ideal particle removal rate.
Since the fresh air system and the air purifier use the same air purification technology, can the two completely replace each other?
Air purifiers purify the existing air in the room, causing people to feel bored when they turn on the air purifier for a long time. At this time, opening windows for ventilation will allow outdoor air pollutants to enter the room unobstructed, which is obviously not feasible. The fresh air system can realize indoor and outdoor air circulation without opening the window, thereby reducing the feeling of boredom. Although some fresh air systems have the function of purifying air, in the case of extremely serious air pollution, the filtering capacity of the fresh air system is insufficient, and the air entering the room is still not clean enough. If the filter capacity of the fresh air system is strengthened, the amount of air sent into the room may be reduced. There will be a pressure difference between indoor and outdoor, and outdoor polluted air will enter the room through the gaps between doors and windows.
Although the fresh air system and the air purifier use the same technology to purify the air, the core functions of the two are not the same. In addition, whether it is possible to introduce outdoor air to achieve ventilation is the main difference between the two, which makes the fresh air system and the air purifier unable to completely replace each other. Only when the two complement each other, can the indoor air be cleaned to the maximum and people can Breathe freely.
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