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中文简体The lower the wind speed, the better the use of Air purifier filters. The diffusion effect (Brownian motion) of small particle size dust is obvious. When the wind speed is low, the airflow stays in the filter material for a longer time, and the dust has more opportunities to hit obstacles, so the filtration efficiency is high. Experience shows that for high-efficiency filters, if the wind speed is reduced by half, the dust transmission rate will be reduced by an order of magnitude (the efficiency value will be increased by 9), and if the wind speed is doubled, the transmission rate will be increased by an order of magnitude (the efficiency value will be reduced by 9).
Similar to the effect of diffusion, when the filter material is electrostatically charged (electret material), the longer the dust stays in the filter material, the greater the possibility of being adsorbed by the material. Changing the wind speed will significantly change the filtration efficiency of the bag electrostatic material. If you know the material is electrostatically charged, the air conditioning system should be designed to minimize the amount of air passing through each filter.
For large particles of dust mainly based on inertial mechanism, according to the traditional theory, when the wind speed decreases, the probability of dust and fiber collision will decrease, and the filtration efficiency will decrease accordingly. But in practice, this effect is not obvious, because the wind speed is small, the rebound force of the fiber to the dust is also small, and the dust is more likely to be stuck.
The higher the wind speed, the greater the resistance. If the service life of the filter is based on the final resistance and the wind speed is high, the service life of the air filter will be short. It is difficult for general users to actually observe the influence of wind speed on filtration efficiency, but it is much easier to observe the influence of wind speed on resistance.
For high-efficiency filters, the speed of airflow passing through the filter material is generally 0.01~0.04m/s. In this range, the resistance of the filter is proportional to the filtered air volume. For the general ventilation filter in the air conditioning box, the speed of the airflow passing through the filter material is in the range of 0.13~1.0m/s, the resistance and the air volume are no longer a linear relationship, but an upward arc, the air volume increases by 30%, and the resistance It may increase by 50%. If filter resistance is a very important parameter for you, you will have to ask the filter supplier for a resistance curve.
Function: antibacterial, mites removal, odor removal, photocatalyst, cold catalyst
Application scenarios: Offices, shopping malls, schools, public places
HEPA stands for High Efficiency Particulate Air. It is a standard defined and developed by the U.S. Department of Energy during the 1940s as part of their efforts to contain the spread of particles and contamination resulting from nuclear testing. This standard has since moved into the consumer market and has become commonplace for air purifiers.
To meet the HEPA standard, the filter must remove 99.97% or more of all particles which are 0.3 microns (micrometers) in diameter. In other words, for every 10,000 particles that are 0.3 microns in diameter, only three of them pass through.
The HEPA standard traps very small particles,many of which are invisible to the human eye and harmful to your health. To provide perspective for size, human hair is approximately 80-100 microns in diameter.
