In the past few years, the function of the air conditioning filter element was only to filter impurities and dust, protect the evaporator, and absorb peculiar smell by hand. Interestingly, at that time, most car owners thought that prolonging the cycle of replacing the air conditioning filter element and air filter could reduce the cost of using a car. One sentence they often heard in 4S stores or repair shops was that you help me blow with an air gun, and I’ll replace it next time. However, with more and more new materials applied to the automotive field, more and more attention has been paid to the interior environment.

It is important to note that HEPA filter element is only effective for the filtration of small particles, as we often mentioned PM2.5. But this kind of filter element has no obvious effect on odor and harmful gas. So you need to mix with other filter materials.

 

 

Non woven fabric

Non woven fabrics are widely used in our daily life, such as masks, diapers, home furnishings and clothing. However, when it is used as the filter layer of air conditioning filter element, it can only filter dust, gravel, catkins, etc. more than 5 μ The results show that PM has no obvious effect on harmful gas and odor. The price of non-woven fabric filter is relatively cheap, but in the face of the complex environment, it is not recommended to use.

 

Bamboo fiber

Bamboo fiber is a natural fiber made from cellulose extracted from bamboo, which is mostly used in clothing, Mats and other household products. As the main filter layer of filter element is not very popular, the market penetration rate of bamboo fiber air conditioning filter element is not high. In terms of internal structure, its filtering principle and effect are similar to those of non-woven fabrics. However, due to the unique bamboo fiber has antibacterial, anti mite, anti odor, anti insect functions, the use of bamboo fiber as air conditioning filter for odor treatment is slightly better than non-woven.

 

 

Activated carbon

Activated carbon filter is the most common air conditioning filter in the market. No matter in the original factory or aftermarket, active carbon filter occupies a large proportion. In the process of conversion of organic materials into activated carbon, there will be internal voids, which are the filter layer of adsorbed gas. When activated carbon should be used in the filter element of air conditioner, it can absorb harmful gases in the car, but the process is relatively long.

 

 

Cold catalyst

As a derivative of photocatalyst, cold catalyst is a new type of air purification material. Note that the word “purification” is used here. When formaldehyde, toluene and TVOC in the air are above 5 ℃ and 40% humidity, the cold catalyst can effectively promote them to react with oxygen in the air and complete the purification. As the cold catalyst is a kind of catalytic oxidant, it does not react directly with the above harmful gases, so its effect is more lasting.

At the present stage, HEPA filter paper is mostly used in the cold catalyst filter element. In fact, this kind of matching is very suitable for both north and South car owners. Whether it is dealing with PM2.5 or harmful gases, the performance of the cold catalyst filter element will not be too bad. However, due to the modeling problem of the cold catalyst, the ventilation will be affected.

 

 

 

Nanocrystalline

Nanocrystalline is also a newly emerging air purification material, but it is not widely used in air conditioning filter. At present, only a few new air conditioning filter elements on the network are used. The reason is nothing more than the cost. Nanocrystalline is made of natural non-metallic minerals. Its internal pores are several times of that of activated carbon, and it is nanoscale. It is very effective for adsorbing harmful gas molecules in nanoscale.

The results show that the nanoparticle can be desorbed above 45 ℃, which is the reverse process of adsorption. So that the material can be reused. Of course, the activated carbon mentioned above can also be desorbed under certain conditions, but the conditions are more stringent. The nano crystal filter element only needs to be exposed to the sun.

Hymanp

I believe this name will be very strange to you. It is a new face in the field of household purifier and air conditioning filter element. In fact, heimanpu can be directly understood as a kind of composite modified ceramic particles, whose shape is similar to the nano crystal mentioned above, and the filtration principle is to produce oxidation catalytic reaction with harmful gases in the air, so as to achieve the role of air purification.

In short, the choice of air conditioning filter, when to replace air conditioning filter must be based on the local environment.