Filtration efficiency of air filter: the first line of defense for fresh air

In modern life, air filter, as an indispensable component in various equipment and systems, bears the important responsibility of filtering impurities in the air and ensuring the normal operation of equipment. Its filtration efficiency is a key indicator to measure the performance of the filter element, which is directly related to the air quality and the stable operation of the equipment. This article will explore the filtration efficiency of air filter in depth, analyze its importance, influencing factors and improvement methods.

1. Definition and importance of filtration efficiency

Filtration efficiency refers to the percentage of particles of a certain size in the air that the air filter can remove. It directly reflects the purification ability of the filter element. In the fields of automobiles, industrial equipment, household appliances, etc., high-efficiency air filters can effectively remove harmful substances such as dust, pollen, bacteria, viruses, etc. in the air, ensure the normal operation of equipment, and provide people with a healthy and fresh air environment.

2. Factors affecting filtration efficiency

The filtration efficiency of air filters is affected by many factors, mainly including filter material, structure, particle diameter, particle type, filtration speed, etc.

Filter material and structure: Filters of different materials and structures have different filtration performance. For example, the HEPA filter uses a combination of a bacterial particle filter and an activated carbon layer to efficiently remove tiny particles and harmful substances from the air; while the activated carbon filter is good at removing odors and chemical pollutants with its strong adsorption capacity.
Particle diameter: Particle diameter is one of the key factors affecting filtration efficiency. Generally, as the particle diameter decreases, the filtration efficiency gradually decreases. In particular, for particles with a diameter of about 0.3 microns, the filtration efficiency of the air filter is the lowest, so special attention should be paid to the filtration effect within this particle size range.
Particle type: Different types of particles also have different effects on filtration efficiency. Experiments have shown that the efficiency of filtering solid particles is usually higher than that of filtering liquid particles. This may be related to the coagulation phenomenon of solid particles, the influence of charge, and the interaction between fibers.
Filtration speed: Filtration speed refers to the rate at which air passes through the filter element. As the filtration speed increases, the diffusion efficiency decreases, while the inertial efficiency and interception efficiency increase. Therefore, there is an optimal filtration speed that maximizes the overall efficiency.

3. Methods to improve filtration efficiency

In order to improve the filtration efficiency of air filter elements, the following measures can be taken:

Select high-quality filter elements: Selecting filter elements with excellent materials and reasonable structures is the basis for improving filtration efficiency. High-quality filter elements usually have higher filtration accuracy and longer service life.
Replace filter elements regularly: As the use time increases, the filter element will gradually become clogged and the filtration efficiency will decrease. Therefore, regular replacement of filter elements is the key to maintaining efficient filtration. It is generally recommended to replace the filter element according to the use of the equipment and the life cycle of the filter element.
Optimize the filtration system: The filtration efficiency of the air filter element can be improved by optimizing the design and layout of the filtration system. For example, increase the number and number of layers of filter elements, improve the air flow path, etc.
Strengthen maintenance: Regular maintenance of the air filter element, such as cleaning and drying, can extend the service life of the filter element while maintaining its efficient filtration performance.