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Factors affecting the life of flat air filters
Factors affecting the life of flat air filtersThe service life of a flat air filter is not fixed but is affected by a variety of factors. Understanding these factors helps us to better estimate the use time of filters and take appropriate measures to extend their life.(1) Filter materials Filter material is one of the key factors that determine the performance and life of flat air filters. Different filter materials have different characteristics, which have a significant impact on the service life of the filter. At present, the common plate-type air filter filter materials are glass fiber, synthetic fiber (such as polyester fiber), non-woven fabrics, and so on. Glass fiber filter paper has the advantages of fine fiber diameter, high filtration efficiency, high-temperature resistance, etc., and is often used in places with high filtration accuracy requirements, such as electronic chip manufacturing workshops and precision instrument production plants. Its dust capacity is relatively strong, in the normal use environment, and can effectively intercept many small particles, to ensure a long service life. However, the texture of the glass fiber material is relatively brittle, during the installation and use of the process, if the impact of a larger external force, is prone to damage, once the filter paper is damaged, the filter effect will be greatly reduced, the life will be shortened. Synthetic fibers (such as polyester fibers) are widely used in some general ventilation and air conditioning systems that are more sensitive to cost and have not particularly high filtration requirements, such as ventilation systems in ordinary office buildings, shopping malls, and other places, because of their low cost and good flexibility. Polyester fiber materials have moderate dust capacity, but their corrosion resistance is relatively weak. If there are chemical corrosive gases in the use environment, the polyester fiber filter material may gradually be eroded, resulting in a decrease in strength, which in turn affects the service life of the filter. Non-woven materials have the advantages of low price and convenient processing and are often used in the initial effect of flat plate air filters, mainly filtering larger particles of dust. However, the fiber structure of non-woven fabrics is relatively loose, the dust capacity is limited, and in an environment with higher dust concentration, it will soon reach the dust tolerance limit, requiring frequent replacement, and its service life is usually short. (2) Use environment The air quality, dust concentration, humidity, and other factors of the use environment play a crucial role in the life of the flat air filter. Air quality is a direct factor affecting the filter life. In areas with poor air quality, such as areas with serious industrial pollution and near urban streets with heavy traffic, a large amount of dust, particulate matter, chemical pollutants, and other impurities are suspended in the air. These impurities will quickly adhere to the filter material, resulting in a rapid increase in the resistance of the filter, and the dust capacity will reach saturation in advance, thus greatly shortening the service life of the filter. For example, on a factory floor near a cement plant, where the air is filled with a large amount of cement dust, a flat air filter may need to be replaced in just a few weeks due to excessive dust accumulation; In remote mountainous areas with good air quality, the same type of filter may be used for months or even longer. Dust concentration is also a key factor. When the dust concentration in the environment is high, the amount of dust that needs to be filtered per unit time of the filter increases significantly, which will undoubtedly accelerate the loss of the filter. For example, in construction sites, mines, and other places, the air is flying with a large number of dust, residue, and other particles, the filter needs to withstand huge filtration pressure, and its life will be significantly shortened. In contrast, in some relatively clean indoor environments, such as dust-free laboratories with strict air purification treatment, the dust concentration is very low, and the service life of the filter will be extended accordingly. The influence of humidity on the life of a flat air filter can not be ignored. In a high-humidity environment, the water vapor in the air is easy to condense on the filter surface, making the filter material damp. On the one hand, the filter material may be deformed after moisture, affecting its structural stability, and then reducing the filtration efficiency; On the other hand, the high humidity environment is conducive to the breeding and reproduction of microorganisms, such as mold, bacteria, etc. These microorganisms grow and reproduce on the filter material, which will not only block the pores of the filter material but also corrode the filter material, leading to the early failure of the filter. On the contrary, in an overly dry environment, the filter material may become fragile due to the loss of water and be easy to break, which will also affect the service life of the filter. (3) Frequency of use and air volume The use frequency and air volume are important factors that affect the loss rate of the flat air filter. The higher the frequency of use, the longer the filter will work, the more chances it will come into contact with dust impurities in the air, and the faster the natural loss. For example, in some large data centers that run 24 hours a day, to ensure the normal heat dissipation of the server and the cleanliness of the operating environment, the air filter needs to continue to work, and this high frequency of use makes the life of the filter much shorter than that of intermittent use. In some seasonal use places, such as the filter in the air conditioning system used only in the summer, the frequency of use is lower, and the life will be relatively long in the same use environment. The air volume also has a significant effect on the life of the filter. When the air volume is too large, the air passes through the filter quickly in a short time, which will have a large impact on the filter material and accelerate the wear of the filter material. At the same time, the large air volume will make more dust particles impact the filter material in a short time, resulting in the dust capacity of the filter reaching saturation faster, and the resistance rising rapidly. For example, in the case that the design of the ventilation system is unreasonable and the actual operating air volume far exceeds the rated air volume of the filter, the filter may be blocked in a short time and have to be replaced in advance. On the contrary, in the case of appropriate air volume, the filter can work stably, and effectively filter impurities in the air, and its service life can be guaranteed. Generally speaking, the service life of the filter is roughly inversely proportional to the air volume, that is, the greater the air volume, the shorter the service life. |
