Experts teach you how to buy and use air purifiers?

Winter is a season with frequent smog weather, and the health hazards caused by smog have become the focus of attention. At the same time, most people spend more than 90% of their time indoors in winter, and the impact of indoor air quality on human health can not be ignored.

Facing the dual indoor and outdoor air pollution, more and more families choose to use air purifiers. For a wide variety of air purifiers on the market, teach you how to choose and use them correctly.

1、 Preparation before purchase

When choosing an air purifier, families should first consider the following three issues: the first is the target pollutants, the second is the place where the purifier is used in the family, and the third is whether there are sensitive personnel in the family.

Step 1: specify the target pollutants to be purified. Indoor air pollutants are divided into outdoor sources and indoor sources. Outdoor sources refer to outdoor air entering the room through air conditioning and ventilation system, natural ventilation, enclosure gap penetration and personnel carrying. Indoor sources include exhaled air discharged from the human body, cooking oil fume, indoor building decoration materials, indoor fungi, dust mites Electromagnetic or static electricity generated by household appliances. For different pollutants, the purification principle of air purifier is different. Therefore, it is necessary to clarify the purification of pollen, dust and PM2 5. Particulate pollutants such as smoke? Or formaldehyde, benzene, volatile organic compounds and other chemical pollutants? Or biological pollutants such as bacteria, viruses, molds and dust mites?

Step 2: identify the main places where the air purifier is used in the family. The purification effect of air purifier is closely related to room area, power of purifier, purification efficiency and other parameters. In addition to the above indicators, noise should also be considered. If it is placed in a large area such as the living room, the purifier with high purification capacity can be selected, and the noise is not taken as the main parameter; If it is placed in the bedroom, the noise should not be too high.

Step 3: we should pay attention to whether there are infants, asthma patients and other sensitive people at home. If yes, it is recommended to buy a pure physical filter air purifier that does not produce ozone.

2、 Purification principle of common air purifiers

Purification principle is an important factor that should be considered when purchasing air purifiers. At present, commonly used purification technologies include the following categories:

  • 1. Physical adsorption: represented by filtration technologies such as porous and large surface area materials such as activated carbon and high efficiency filter (HEPA), the combination of adsorbent and adsorbent depends on van der Waals force to purify the air. It is the safest and most efficient filtration method at present. Since all adsorbents have a certain adsorption capacity and weak binding force, desorption will occur when the adsorbent reaches the saturated state, releasing formaldehyde or particles, resulting in secondary pollution. Therefore, it should be replaced regularly during use.
  • 2. Photocatalysis technology: represented by photocatalyst and cold catalyst technology, it can decompose harmful gases while purifying. The working principle of this kind of purifier is to coat the catalyst on the carrier and irradiate the catalyst with a specific wavelength of ultraviolet light source. Turn on the fan to make the air pass through the carrier at a certain flow rate, and the catalyst reacts with formaldehyde in the air under the irradiation of ultraviolet light, so as to achieve the purpose of purification. There are many kinds of materials for photocatalysis, such as nano-TiO2, MnO2, etc., and the main product is CO2. The principle of photocatalysis has the characteristics of no secondary pollution, which is in line with the concept of green environmental protection in the new era. The efficiency of purifying formaldehyde is related to many factors, such as the initial concentration of pollutants, indoor temperature and humidity. The blockage of the microporous surface of the catalyst will greatly reduce its purification efficiency.
  • 3. Ion technology: represented by negative ion and silver ion technology, it can sterilize and effectively purify the air. Negative ions are the general name of negatively charged ions in the air. They are colorless, tasteless and have strong adsorption characteristics. They can adsorb particulate matter in the air nearby. The negative oxygen ion air purifier generates a strong electric field to diffuse to the air and actively capture pollutants in the air, such as formaldehyde, benzene, toluene, ammonia and other substances, so as to condense and settle them, so as to purify the air. However, strong electric field and discharge process are easy to produce ozone, which is harmful to human body.
  • 4. Electrostatic dust collection: it mainly adopts the way of electronic dust collection, uses static electricity to charge particles in the air, and then catches charged particles through the dust collection device, so as to achieve the purpose of purification. It has high dust removal efficiency and can capture 0.01 ~ 0.1um particles. The disadvantage is that the high-voltage power supply is required, the dust collection capacity of the dust collection device is small, and the purification effect is not very ideal. Generally, the dust collection device needs to be cleaned once every 1 ~ 2 weeks. It will produce ozone and bring secondary pollution.
  • 5. Biological enzyme purification: Based on the principle of biological decomposition, biological enzyme is a protein with catalytic function, which decomposes the formaldehyde pollutants in decoration materials into water and carbon dioxide, and removes the formaldehyde pollutants at the source without secondary pollution. Enzyme catalysis has the characteristics of high efficiency, specificity and mild action conditions, and can continue to work by using the reproductive ability of microorganisms. There are also some deficiencies in the removal of formaldehyde by biological enzymes, such as the need for appropriate temperature and humidity. If the temperature is too high or too low, the enzyme activity will be reduced or even completely inactivated.
  • When purchasing, physical filtration and adsorption technology should be the first choice, and air purifiers with various purification technologies should be selected as far as possible. Air purifiers that produce ozone should be avoided as far as possible.

3、 Selection of air purifier

A truly effective air purifier should achieve "three high and one low", that is, high clean air volume, high cumulative purification capacity, high energy efficiency value and low noise.

High clean air volume (Cadr): clean air volume is a parameter of the purification capacity of the purifier for target pollutants (particulate matter or gaseous pollutants). The greater this value is, the stronger the purification capacity of the purifier per unit time and the better the purification efficiency. The applicable area of the purifier can be estimated by the clean air volume of particulate matter: S = (0.07 ~ 0.12) Q, where s represents the applicable area (unit: m2) and Q represents the clean air volume of particulate matter (unit: m3 / h). For example, the clean air volume marked on an air purifier is 400m3 / h, and the applicable area is about 28 ~ 48㎡.

High cumulative purification volume (CCM): the cumulative purification volume refers to the total mass of target pollutants accumulated for purification treatment when the clean air volume of the air purifier attenuates to 50% of the initial value. The higher this parameter is, the higher the purification capacity is

HEPA air purifier, HEPA filter screen
With the rapid development of the city, haze has also become an "urban disease". Everyone must know about the harm of haze to human body, and controlling haze is also a long-term project. In order to protect their health, most friends choose active defense, such as wearing anti haze masks when going out and using air purifiers at home. As the preferred anti haze product for thousands of families, the air purifier is favored by everyone for its efficient purification effect, but the air purifier is by no means a product that doesn't care when the switch is turned on. If you want to use it well for a long time, you have to know HEPA filter screen.
What is HEPA filter? HEPA (high efficiency particulate air filter), which means high efficiency air filter in Chinese, is a filter screen that meets the HEPA standard. For 0.1 micron and 0.3 micron, the effective rate reaches 99.7%. The characteristic of HEPA screen is that air can pass through, but small particles cannot pass through. It's PM2 5 killer can also capture molds, bacteria and viruses. It can be used in areas with poor air environment to maximize the protection of users' respiratory health.
It can remove particles with a diameter of less than 0.3 microns (1 / 200 of the hair diameter) with a removal efficiency of more than 99.97%. It is the most effective filter medium for pollutants such as smoke, dust and bacteria. If there are relatives who smoke at home, it is necessary to choose HEPA filter air purifier in order to protect the next generation from the harm of second-hand smoke.
HEPA can be divided into five materials: PP filter paper, glass fiber, composite PP pet filter paper, melt blown polyester non-woven fabric and melt blown glass fiber. Although the materials are different, they all have one thing in common: large wind resistance, large dust capacity and high filtration accuracy. In addition, there are three HEPA high-efficiency filters. One is super HEPA high-efficiency filter, which can purify 99.9995%. One is the antibacterial high-efficiency air filter without partition, which has antibacterial effect and prevents bacteria from entering the clean workshop. The other is the sub HEPA high-efficiency filter screen, which is cheap and used in the purification space with low requirements before. For our commonly used air purifiers, there are many filters with the latter two. After all, you get what you pay for.
In order to filter the air purifier efficiently for a long time, you must be able to maintain the HEPA filter screen. If there is no specific indication, it cannot be washed, but under the current situation of serious indoor air pollution in China, the longest service life of HEPA filter screen is generally only 3 months or less, which means that HEPA filter screen needs to be replaced frequently. Although the replacement cost of HEPA filter screen is high, and its service life can be extended to a certain extent by cleaning with a vacuum cleaner, if the generally white HEPA filter screen surface has tended to black, it is recommended to replace it as soon as possible in order to ensure air filtration effect and health. Moreover, the HEPA filter screen has been produced on a large scale, and the cost and price are constantly declining. It is still very convenient to replace the filter screen.
In short, the key role of HEPA filter screen for air purifier is to effectively filter PM2 5 and other harmful gases can also capture molds, bacteria and viruses, filter second-hand smoke and harmful micro particles in the air, and protect users' respiratory health. It is an indispensable and important part of the air purifier. However, it can not be used in the kitchen, because oil fume will accelerate the loss of HEPA filter screen, and it can not be used in the environment with particularly strong cigarette smell and poor air circulation (such as mahjong Hall). Cigarettes will greatly shorten the service life of HEPA. If it is an ordinary family to prevent haze and purify the air, the HEPA filter screen can be properly maintained according to the above methods. Under normal circumstances, it can be used for several months without changing. It not only saves money, but also purifies the air and protects the respiratory health of the whole family. It is worth choosing for users who want to purify the respiratory environment.
New concept of health, vehicle air purifier

With the improvement of the quality of life, more and more friends pay attention to the health problems in the car.

We all know that the on-board air purifier can purify the air in the car. However, it is difficult to buy the on-board air purifier. There are many brands of on-board air purifiers on the market, with complex models and prices ranging from hundreds to thousands. How to choose?

How to choose a good on-board air purifier? In short, you can look at the parameters, the efficacy and the certification.

1. Cadr is the key performance parameter of on-board air purifier, which refers to the amount of clean air per unit time, which is divided into the Cadr value of particulate pollutants and the Cadr value of gaseous pollutants.

We are familiar with PM2 5. Dust and smoke belong to particulate pollutants, formaldehyde and benzene belong to gaseous pollutants. The larger the Cadr value, the stronger the purification ability in this field.

2. General air pollution is divided into PM2 5 as the representative of particulate pollutants and gaseous pollutants represented by formaldehyde. Whether an on-board air purifier is effective depends on whether it can effectively filter a variety of pollutants.

3. An excellent on-board air purifier generally needs to be tested and certified by a third-party organization, which also shows the quality of the product. At the same time, the product removes PM2 5. The purification ability of bacteria, viruses and nicotine has also passed the test of a third-party authority.

Ultraviolet air purifier

Ultraviolet air purifier is mainly used in families. It is a necessity for household disinfection and sterilization.

Function of ultraviolet air purifier

Adsorb PM2 in the air 5、PM0. 3 and other micro dust and various bacteria. In insufficient sunshine or haze days, Midea air purifier can automatically capture dust, bacteria and other particles in the air after air flow through air circulation, and completely adsorb the particles on the imported h13-hepa filter screen.

The unique UV lamp sterilization device of the air purifier can decompose and kill the bacteria blocked on the filter screen after the air flows, greatly reducing the secondary pollution caused by bacterial residue.

The UV device has a wavelength of 240 ~ 280 nm (about 254 has the strongest bactericidal power). The UV at this wavelength has a strong bactericidal effect.

Purification: release the purified air, kill the bacteria and harmful micro dust in the air, and release the air beneficial to the human body to achieve the purification effect.

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