Views: 6 Author: Site Editor Publish Time: 2020-05-09 Origin: Site
Filter element is the core filter part of air purifier, its quality directly determines the effect of purification.
At present, xiaomi provides three air purifier filter elements, economic version, except formaldehyde enhanced version, anti-bacterial version, performance difference between different filter elements will be very big?Which one is worth choosing?
First of all, what are the important components of the filter element of an air purifier?It is mainly composed of primary filter, HEPA filter and activated carbon substrate filter.HEPA filters purify particulate matter through interception, gravity, airflow and chemical reactions.Activated carbon substrate filter screen through adsorption and chemical reaction to purify gaseous pollutants (such as formaldehyde, toluene, odor, etc.).
There is a value that can be used to measure the life of filter element. The cumulative purification quantity CCM represents the capacity of filter net to purify pollutants accumulatively.The new national standard USES 4 grades to judge the service life of HEPA filter screen and activated carbon filter screen respectively. The higher the grade, the longer the use time of the filter screen.The official claim of xiaomi filter element is that the particulate matter CCM is P4 level, but no specific value has been marked, so it is impossible to truly distinguish the three filter elements, so we still need to compare their HEPA filter screen size and activated carbon filling quantity.
一、Comparison of dust capacity of HEPA filter (particulate matter CCM)
There are two main factors affecting the CCM of particulate matter. The first is the size of the filter screen. The larger the extended area of the filter screen is, the higher the dust capacity of the filter screen can be.The second is the filter level (material), the high level of HEPA filter tends to have a higher dust capacity.
Area comparison of three filter elements HEPA net
Millet filter element HEPA net grade is H11, the remaining difference is only the area.It is not difficult to calculate the area of the filter screen, with a ruler to measure the height (width) of the filter paper, and the thickness of the filter paper, and then count how many fold the filter paper, you can multiply out the area
The thickness of HEPA net of three filter elements
Conclusion: the economic version of the filter element, the antibacterial version of the filter element filter screen expanded area is larger (slightly larger), the same nature of the larger HEPA filter screen area, the higher the dust capacity, the longer the service life.
二、Comparison of filling amount of activated carbon (formaldehyde CCM)
Current mainstream air purifiers remove formaldehyde/benzene/peculiar smell by activated carbon adsorption, and the cumulative purification amount of formaldehyde is proportional to the quality of activated carbon and the filling amount of activated carbon.
There are two main types of activated carbon used in the market: traditional activated carbon and modified activated carbon, among which the traditional activated carbon has a small adsorption capacity and is easy to saturate.The adsorption capacity of modified activated carbon is large, and the catalytic decomposition material is attached to the surface, which can prolong the adsorption life of activated carbon and improve the secondary pollution of activated carbon adsorption.
The width and density of three filter elements activated carbon mesh
Millet three filter elements are high iodine value modified activated carbon, adsorption is good, but the amount of activated carbon filling is inconsistent.The weight of the three activated carbon filter elements has not been officially announced. We disassembled the activated carbon filter mesh of the three filter elements and weighed the net weight of the activated carbon mesh.
Net weight of activated carbon net
Conclusion: it is not difficult to find by weighing that there are more active carbon layers in addition to formaldehyde filter element, which are heavier and have longer service life.
From the actual measurement, it can be known that the economic version and the antibacterial version have a large amount of dust, and the removal of formaldehyde filter element activated carbon more adsorption for a longer time.In addition, the antibacterial version of the filter element on the HEPA screen added a layer of antibacterial material coating, said to be more than 99% antibacterial rate, effectively block bacteria, mold and dust mites.