The smog for several days has enveloped Beijing, and the air pollution warning in Beijing has been upgraded from yellow to orange. It is also the first orange warning of heavy air pollution this year. It is also time to take out the artifact of the home office - the air purifier! However, we found that when faced with a variety of air purifiers of varying prices, even if you understand a lot of truth, still do not know how to choose a reliable purifier.
The new version of the "Air Purifier" national standard was officially released on September 15, 2015, and will be officially implemented on March 1 next year. The current air purifier industry chaos may end. Zhu Yanlai, the main drafter of the new edition of the National Standard for Air Purifiers and the deputy chief engineer of the China Household Electrical Appliances Research Institute, told us how to purchase an air purifier.
The first step: the filter or electrostatic adsorption?
There are tens of thousands of air purifier products. In fact, they can be divided into two categories: the filter type and the electrostatic type. The high-grade filter is usually called HEPA, and the purifier is filter. The combination of net and static electricity.
How filter mesh purification works
As a common physical purification technology, strain filter purification is a relatively mature technology for intercepting particulate matter in the air. Generally, it is a plastic or glass fiber interlaced by a special process to form a network structure, and by using physical effects such as direct interception, inertial collision, diffusion adsorption, etc., various sizes of particles are respectively trapped on the surface of the filter or adsorbed inside. To achieve the purpose of purifying the air.
How electrostatic precipitator air purifier works
Electrostatic precipitator technology is another mature particle purification technology. Its principle is to generate a high-voltage electrostatic field in a specially designed inlet and outlet air duct, so that the particles in the passing air are charged and charged by oppositely charged electrodes. Collect it to achieve a cleansing effect.
After understanding the two basic technical principles, we also know that indoor pollutants are generally divided into three categories: particulate matter, gaseous pollutants and microorganisms. According to national standards, particulate matter is further divided into PM10 (inhalable particulate matter) and PM2.5 (fine particulate matter); typical gaseous pollutants are formaldehyde, toluene, ozone, volatile gaseous pollutants, etc.; and microbes refer to human health. Influential bacteria. Various levels of particulate filter and electrostatic adsorption technology have certain removal effects on these indoor pollutants.
It should be noted that the purification principles of some purifiers, such as static electricity, negative ions, ultraviolet photocatalysis, plasma and other technologies, will release ozone more or less. If there are sensitive people such as infants and asthma patients in the home, it is recommended not to produce ozone. Pure physical adsorption machine. In the national standard, the ozone release of the air purifier is mandatory. When purchasing, the purifier conforming to the ozone release standard should be selected. "GB4706.45-2008 Special requirements for safe air purifiers for household and similar electrical appliances" stipulates that the ozone concentration Baidu ratio should not exceed 5 × 10-6, which is very low. However, ozone is also one of the natural atmospheric components, and the safe concentration below is harmless to the human body.
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