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What factors are related to the resistance of folding combined air filters?
What factors are related to the resistance of folding combined air filters?The resistance of folding combined air filters is related to the following factors:Filter Properties Material: Different materials have different pore structures and surface characteristics, which will affect the resistance of air through. For example, glass fiber filters usually have slightly higher resistance than synthetic fiber filters because the fiber diameter of glass fiber is finer, the pores are smaller, and the obstruction of airflow is greater. Thickness: The thicker the filter material, the longer the path that the air needs to pass through, and the greater the resistance. However, increasing the thickness of the filter material can improve the filtration efficiency, so a balance needs to be struck between filtration efficiency and resistance. Mesh number: The mesh number of the filter material reflects the size and density of its pores. The higher the mesh number, the smaller the pores, the more filter points per unit area, and the more effective the interception of small particles, but at the same time the resistance of air passing will also increase. Folded structure Folding depth: When the folding depth is larger, the effective area of the filter material increases, the airflow rate is relatively reduced, and the resistance is reduced. However, if the folding depth is too large, it may cause the flow path of air in the filter to be too complicated, and locally produce eddy currents, but increase the resistance. Folding spacing: too small folding spacing will narrow the air passage and speed up the air flow rate, thereby increasing the resistance; The folding spacing is too large, although the airflow resistance is small, it will reduce the effective area of the filter material and reduce the filtration efficiency, and it is generally necessary to choose the appropriate folding spacing according to the actual application needs. Airflow The greater the airflow, the more air the filter needs to deal with per unit time, and the flow rate of air in the filter material will also accelerate, resulting in increased resistance. The relationship between the two is usually non-linear, and when the airflow exceeds the filter's designed rated flow, the resistance will increase sharply. Particle loading With the increase of the use time of the filter, the filter material will gradually accumulate impurities such as dust and particles, which will block the pores of the filter material and narrow the channel through which the air passes, resulting in increased resistance. When the resistance reaches a certain level, the filter needs to be replaced or cleaned and maintained. Environmental factor Temperature: Temperature changes affect the density and viscosity of the air, which in turn affects the resistance of the filter. Generally speaking, the temperature increases, the air viscosity increases, and the resistance increases slightly; As the temperature decreases, the density of the air increases, and so does the resistance. Humidity: In a high humidity environment, the water vapor in the air may condense on the surface of the filter material, making the filter material damp, on the one hand, it will increase the weight of the filter material, on the other hand, it may make the pores of the filter material smaller, resulting in increased resistance. In addition, the humid environment makes also easy to breed bacteria and mold, which further affects filtration performance and resistance. |
