Experimental Research on the Efficiency of Air Filter
The efficiency of the air filter is different, and the detection method is also different. Therefore, when choosing an air filter, it is necessary to consider its efficiency and also to understand its test method and test dust. my country is the first country in the world to use the atmospheric dust grouping counting method to test the efficiency of filters, and in 1990 promulgated the 'General Ventilation Air Filter Performance Test Method' (GB 12218-1990). For high-efficiency air filters, various countries' tests Dust and test methods are quite different. For example, the 'High-efficiency air filter performance test method, permeability and resistance' promulgated by my country (GB/T 6165-1985) regards the oil mist method and the sodium flame method as the legal performance test methods at the same time, and Germany adopts the paraffin oil mist method ( DIN24185), the United Kingdom adopts the sodium flame method (BS3928-1969), and the United States adopts the DOP (dioctyl phthalate) method. Various countries have proposed air filter standards based on the selection of standard test methods, such as the British BS5295 standard with DOP as the test dust, EUROVENT4/9 formulated by the European Air Treatment Equipment Manufacturers Association, and various air filter standards at home and abroad. See Table 3-3 for comparison with efficiency. Table 3-3 Comparison of various air filter standards and efficiencies at home and abroad. China’s standard European standards EUROVENT4/9 ASHRAE standard measurement method efficiency (%) ASHRAE standard colorimetric method efficiency (%) American DOP method (0.3—efficiency (%) European standard EN 779—1993 German standard DIN24185 coarse-efficiency air filter EU1 <65 G1 A coarse-efficiency air filter EU2 65-80 G2 B1 coarse-efficiency air filter EU3 80-90 G3 B2 medium-efficiency air filter EU4 >90 G4 B2 medium efficiency air filter EU5 40-60 F5 C1 high medium efficiency air filter EU6 60-80 20-25 F6 C1/C2rt effective air filter EU7 80-90 55-60 F7 C2 China standard European business standard EUROVENT4/9 ASHRAE standard measurement method efficiency (%) ASHRAE standard colorimetric method efficiency (%) American DOP method (0.3nm) efficiency (%) European standard EN 779-1993 German standard DIN24185 high efficiency air filter EU8 90-59 65-70 F8 C3 high-efficiency air filter EU9 3u003d95 75-80 F9 sub-high-efficiency air filter EU10 >85 H10 Q sub-high-efficiency air filter EU11 >98 H11 R high-efficiency air filter k EU12 >99.9 H12 R/S high-efficiency air filter A EU13 >99.97 H13 S high efficiency air filter B EU14 >99.997 H14 S/T high efficiency air filter C EU15 >99.997 U15 T high efficiency air filter D EU16 >99.99997 U16 C high efficiency air filter D EU17 >99.999997 U17 VDomestic Commonly used testing methods for air filters include: (1) The quality method is used to test the efficiency of coarse and medium-efficiency air filters. Test principle: The filter is installed in the standard test wind tunnel, and the upper wind continuously generates dust. The quality of dust passing through the filter is measured at intervals, and the filter efficiency calculated by the dust quality of the filter at this stage is obtained. The relevant standards that use this method are China's 'General Ventilation Air Filter Performance Test Method' (GB 12218-1990 ), American ANSI/ASHRAE52.1-1992 and European EN779-1993. (2) The colorimetric method is used for the efficiency detection of medium-efficiency air filters. Test principle: sampling before and after the filter, dusty air through the filter paper will pollute The filter paper is irradiated under the light source, and then the light transmittance of the filter paper before and after the filter is measured with a photoelectric tube colorimeter (photodensitometer); under the same conditions of the composition, size and distribution of the dust, the optical density and dust accumulation are used Proportional relationship , Calculate the filtration efficiency. (3) The particle counter method is used in the detection test of high-efficiency air filters in clean rooms, and is widely used in clean air-conditioning projects. Test principle: Pass the dust-containing air flow through the strong light illumination area at a small flow rate. When the dust particles in the tested air pass through in turn, each dust particle will generate a light scattering to form a light pulse signal, according to the light pulse signal amplitude The size of the particle is proportional to the size of the particle surface. The particle number and brightness are measured by the photomultiplier tube to determine its filtration efficiency. For coarse-efficiency air filters, the quality can be judged based on the filtration efficiency of the particle size range of ^5/zm; for general medium-efficiency air filters, the filter efficiency of the particle size range available to judge whether it is good or bad; for high- and medium-efficiency air The filter efficiency of the particle size range that can be used by the filter judges its performance; as for the filter efficiency of the particle size range that can be used for the sub-high efficiency and high efficiency air filter, it is judged whether its performance is good or bad. (4) DOP (Dioctyl Phthalate) method is used for efficiency testing of high efficiency air filters. Test principle: The test dust source is 0.3/im monodisperse phase DOP droplets are heated into vapor, condensed into tiny droplets under certain conditions, after removing the excessively large and small droplets, the particles of about 0.3/mi are left behind, fog DOP enters the air duct, and then measures the turbidity of the gas sample before and after the filter to determine the filter efficiency of 0.3/xm dust. The DOP method has a history of more than 50 years. This method was once the most commonly used method for measuring high-efficiency air filters in the world.
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