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Characteristics of Air Filters
Release Date:
2021-03-23
I believe many of us are aware that Chinese air purification filters serve to filter pollutants from the air and purify the ambient air. But did you know they have other functions as well? Let me share some information on this topic with you. You probably already know, too. Through an analysis of the production specifications for air filters and other related cleaning equipment, radiant energy is expressed in terms of radiant output, radiant intensity, and radiant exposure. Radiant output refers to the amount of energy emitted per unit time, while radiant intensity—corresponding to the brightness of a fluorescent light—is the radiant output per unit area. Radiant exposure, on the other hand, is the product of radiant intensity and irradiation time.
I believe many of us are aware that Chinese air-purification filters can filter pollutants from the air and purify the ambient air. But did you know they have other functions as well? Let me share some information on this topic with you. You probably already know, too.
By analyzing the production descriptors of air filtration media and other related cleaning equipment, radiant energy is expressed in terms of radiant output, radiant intensity, and radiant exposure. Radiant output refers to the amount of energy emitted per unit time, while radiant intensity, analogous to the luminous intensity of a fluorescent lamp, is the radiant output per unit area. For air purification filters, radiant exposure is the product of radiant intensity and irradiation time.
The radiation output of an air filtration system depends on environmental factors such as temperature, humidity, and air velocity; even at low ambient temperatures, the output remains low. Increasing humidity also reduces the sterilization efficacy, although UV lamps in air filters are typically specified based on a relative humidity of 60%. As indoor humidity rises, sterilization effectiveness declines, necessitating a corresponding increase in exposure time. For instance, at 70%, 80%, and 90% relative humidity, achieving the same level of sterilization requires increasing the irradiance to 50%, 80%, and 90%, respectively. Air velocity likewise affects the effective output. Moreover, the sterilizing efficacy of UV lamps varies with microbial species, requiring adjustments to the UV exposure dose for each specific pathogen. For example, the required exposure dose for bactericidal microorganisms is 40 to 50 times higher than that for other types of microorganisms.
The intensity of ultraviolet radiation decreases as the irradiation distance increases. For example, test data from a 30 W UV lamp manufactured by a certain factory show that at an irradiation distance of 1 m, the radiation intensity is 72 µW/cm²; at 2 m, it drops to 19.5 µW/cm²; and at 3 m, it further decreases to 8 µW/cm². Therefore, in order to ensure uniform sterilization with UV light, the impact of the installation height on radiation intensity must not be overlooked.
The bactericidal efficacy of ultraviolet lamps decreases as their service life increases; after 100 hours of operation, the output drops to an additional level. The point at which the lamp’s output falls to 70% or less of its initial value is defined as its average rated lifespan, and it should not be expected that a UV lamp will operate beyond this average lifespan. Replacement is therefore necessary; typically, domestically produced UV lamps have an average lifespan of 2,000 hours.
Finally, it should be noted that the bactericidal efficacy of ultraviolet radiation is determined by the radiation dose, which is typically calculated as the product of radiation intensity and exposure time. Therefore, to enhance the disinfecting effect, either the radiation intensity must be increased or the exposure time must be extended.
The above is an overview of the features of air purification filters. We hope it proves helpful to you.
Keywords:
Filter mesh, filtration, photocatalytic filter mesh
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