Three steps to teach you to choose the right air purifier
The smoggy weather that has occurred frequently in recent years has driven the air purifier industry. Although the Chinese air purifier market has not developed for a long time, there have been several generations of products. From activated carbon adsorption to ozone sterilization, to the latest PHI, the technical principles are varied and the purification effects are different, so you will be confused when choosing a purifier. How do we choose the purifier that suits us? Xiaobian teaches you three steps today to let you choose the right air purifier for you.
The first step: understand indoor air pollution and tap your own needs.
First, we need to understand what we are buying for an air purifier. Is it just purifying PM2.5? In fact, in addition to PM2.5, there are other pollutants that threaten human health indoors, so let Xiaobian give you a popular science.
Indoor air pollution is mainly divided into three categories:
1. Chemical pollutants: mainly refers to volatile toxic gases, such as formaldehyde, benzene, TVOC and other decoration pollution that we are familiar with. People have a common misunderstanding of such pollutants: “The new decoration is very serious.” This problem does not exist in the seven-year-old house.” In fact, contaminated releases such as formaldehyde, benzene, and TVOC can last up to 3-15 years. Long-term exposure to such indoor air pollution sources, even low concentrations can cause chronic respiratory diseases, female menstrual disorders, pregnancy syndrome, causing neonatal physical decline, chromosomal abnormalities, and even nasopharyngeal cancer. The high concentration of pollution sources will cause toxicity to the nervous system, immune system, liver, etc., and even teratogenic and carcinogenic effects.
2, physical state particles: typically represents PM2.5 respirable particulate matter. The smaller the particle size of inhalable particles, the greater the harm to the human body. Respirable particles with a particle size of fewer than 10 microns can enter the human respiratory tract. Less than 2.5 microns can be deposited in the lungs, and harmful substances can enter the blood through the alveoli. Statistics from the European Union show that PM2.5 causes 386,000 deaths per year and reduces people’s life expectancy by 8.6 months. PM2.5 can also be a carrier of viruses and bacteria, contributing to the spread of respiratory infections.
3. Biological pollutants: mainly refers to active harmful microorganisms floating in indoor air such as bacteria, viruses, molds, and spores. Size range: 0.01 to 10 microns. Bacteria can cause various diseases, which can cause death in severe cases. For example, the mortality rate of Legionella pneumophila is 15%, and the mortality rate of E. coli in Germany is over 5%. The virus is the initiator of various epidemic diseases and is highly contagious through airborne transmission. The SARS mortality rate was 11%, and the A1 H1N1 mortality rate was 6.77%. Mold not only brings unpleasant odor, but is also a major cause of asthma and allergic diseases such as rhinitis, but it is ignored by most people.
Knowing these three pollutants, everyone should have found the one that they are most worried about. Like Xiaobian, a family of old people, pregnant women, and a small family, three types of pollutants are the focus of my concern.
Step 2: Understand the advantages and disadvantages of purification technology, choose the one that suits you best.
At present, the name of the air purifier technology on the market is varied. In fact, it is basically the following categories:
HEPA mesh filtration technology: effective for biological pollutants and physical particles. The fan is used to compress the air through the filter to trap contaminants such as particulate matter and microorganisms on the filter. It only acts as a trap and cannot be removed or inactivated at all. Long-term accumulation may become a larger source of pollution. It is a passive treatment method. If the air cannot pass through the equipment, the interception effect will not be achieved. In order to allow the air to pass through the filter in a large amount, it is often necessary to use a high-powered fan with a large noise to perform the suction treatment.
PHI active purification technology: very effective for chemical pollutants (volatile harmful gases), biological pollutants, physical particles. PHI purification technology produces a variety of air purification factors under the action and control of broad-spectrum ultraviolet light and various rare metal catalysts. It actively mixes with harmful pollutants in indoor air through air diffusion and air circulation to purify indoor air. It can kill more than 90% of bacteria, viruses, and molds in the air for a short time, and can quickly decompose chemical volatile gases and odors such as formaldehyde and benzene. At the same time, it can effectively eliminate inhalable particles in the air. It is truly green and noise-free. Especially under the premise of not affecting the human body and the environment, it can improve the self-purification ability of the air itself and remove air pollutants in a dynamic environment.
Activated carbon adsorption: It is effective for odor and chemical pollutants (volatile harmful gases). Using coal, shell, wood, petroleum residue and other materials with high carbon content as raw materials, after high-temperature activation treatment, microporous activated carbon powder is formed and then adhered to the filter network with a polymer binder. Activated carbon fiber mesh. It is easy to saturate, and the adsorbed pollutants will have the potential to re-evaporate into the air when the ambient temperature rises.
Electrostatic adsorption: It is effective for biological pollutants and physical particles. Let the air pass through the high-pressure ionization zone, so that the particles in the air carry a positive charge, and are adsorbed on the negatively charged dust collecting plate when passing through the dust collecting chamber. High-voltage disconnection is easy to produce carcinogens, and it is also a passive treatment method. If the dust collector is not cleaned in time, it may become a new source of pollution.
Photocatalyst: It is effective for biological pollutants and chemical pollutants (volatile harmful gases). Using the photocatalytic properties of special materials, the light energy is converted into strong oxidizing chemical energy, and the pollutants in the air are removed by the oxidation of the strongly oxidized particles. Due to the immature production process, the industrial-scale application has not been realized, and the material cost is high.
UV: Effective for biological contaminants. A tube group consisting of an ultraviolet Clamp generates ultraviolet light having a wavelength of 254 nm to illuminate the air. After receiving sufficient UV dose, the internal structure of the microbial DNA is destroyed, chemical bonds are broken and cannot be replicated, thereby killing the microorganisms. Direct irradiation is harmful to the environment and the human body, and cannot meet the timely sterilization protection in a human environment.
Negative ions: Effective for physical particles. The free electrons generated by the ionization of air molecules under the action of high pressure or strong rays are mostly obtained by oxygen to form negative ions. Negative ions can adsorb particles in the air to form larger particle clusters, and settle down when the air cannot hold the pellets, so as to purify the air. Due to the poor stability and short service life of the negative ion generator, the actual application effect is not ideal.
In addition to the PHI purification technology, there is no purification technology that can target all pollution sources at the same time. Therefore, most air purifiers on the market will use several technologies at the same time. Although this can barely target all pollution sources, it is bound to use high energy consumption. High noise, etc. as a price.
When we choose an air purifier, be sure to ask the salesperson that this machine uses the purification technology to determine if it can target the source of concern.
The third step: understand the potential cost, there is a clear account in mind
At present, the price of the machine on the market is very large. Except for the PHI technology, most air purifiers need to replace the consumables regularly, which leads us to periodically purchase new expenses to purchase consumables during the later period of use. According to the current average domestic decoration level and outdoor air, it is generally recommended to replace the consumables in two or three months (don’t listen to the salesperson saying that one year of replacement, it may be recommended for use in Switzerland.).
We assume that we are purchasing a purifier of about 5,000 yuan. The cost of replacing consumables every three months is 600 yuan, then the cost of the first year is 8,000 yuan, and the annual investment is 2,400 yuan (not considering the electricity bill). If you use 7 years, then our total investment in this machine is about 22,400 yuan.
For a purifier that uses PHI purification technology that does not require late input consumables, we need to know how long it can last. Take An Anjie air purifier as an example. It uses PHI purification technology for 25,000 hours. We can calculate it for 10 hours according to the time of 10 hours a day. In this case, the price of the machine of 17999 yuan seems to be acceptable.
When choosing an air purifier, we pass these three steps, Xiaobian believes that you can choose the one that suits you best.
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