How does the air purifier purify the air? Be alert to secondary pollution when using
When the smog weather occurs, the air purifier becomes the new favorite of the family. Air purifiers can adsorb, decompose or convert various air pollutants, including PM2.5, dust, pollen and more.
How does a cheap and best air purifier remove particulate matter from the air? There are currently three main methods: mechanical filter type, electrostatic electret filter type and high voltage electrostatic dust collection.
The mechanical filter is a physical interception, which uses a filter to filter out particles in the air. In order to improve the purification efficiency, the filter structure needs to be very dense, and the impact force of the airflow on the filter screen is relatively large, so the filter has a short life.
The electrostatic electret filter is a dielectric material made of a polypropylene film, which can store space charges for a long time and utilize the electrostatic force of the charge to trap dust particles. The air is filtered by the electrostatic electret material, and the dust removal wind resistance is low, and the high capturing efficiency can be achieved with low energy consumption.
High-voltage electrostatic dust collection uses a high-voltage electrostatic field to ionize the gas so that the dust particles in the air are electrically adsorbed to the electrodes. This method of dust collection has a small wind resistance and a high efficiency for collecting dust from smaller particles. However, the effect of capturing larger particles and fibers is poor, and it is easy to discharge. The cleaning takes time and effort, and ozone is easily generated to form secondary pollution.
In addition to the above three-particle removal technologies, newer air purifiers currently have negative ion and plasma methods. The two methods of removing dust particles are similar to high-voltage electrostatic dust collection. All of the particles in the air are charged and coalesced to form larger particles. However, the particles are not actually removed, but they are attached to the surface, which is likely to cause dust to rise again.
General household air purifiers are mainly filtered type and electrostatic type. The main difference between the two is that the filter type is equipped with a HEPA (High-Efficiency Air Filter) filter that needs to be replaced, but the electrostatic type does not. The electrostatic air purifier needs to clean the electrostatic dust collecting parts frequently. The filter air purifier is the most common type of product on the market, and its magic weapon is safe and efficient.
The most harmful to the human body in the air is dust less than 2.5 microns because it penetrates cells and enters the bloodstream. Electrostatic air purifiers filter dust, smoke, and bacteria that are smaller than cells. Using a high-voltage electrostatic field of about 6000 volts, it can instantly kill bacteria and viruses attached to dust and prevent diseases such as colds and infectious diseases.
The core of the filter air purifier is the filter, and each purifier has several layers of different functional filters. The filter is dirty and the water cannot be washed and must be replaced. When the filter material is saturated, it becomes a “source of pollution” and secondary pollution occurs. Therefore, even in the case of good air quality, the filter can not be used for more than half a year.
Some merchants claim that air purifiers can remove formaldehyde. Is this true? The evaluation results of the National Indoor Interior-Environment and Environmental Product Quality Supervision and Inspection Center show that the existing air purifiers are basically ineffective. As a consumer, you must have a pair of eye-catching eyes, don’t be fooled by the publicity of the business.
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