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Industrial air filter filtration efficiency measurement method
Industrial air filter filtration efficiency measurement methodIndustrial air filters are used in a wide range of applications, such as primary filtration for air conditioning and ventilation systems clean room return air filtration pre-filtration for local high-efficiency filtration devices. It is mainly used as the primary filtration of multi-stage filtration systems.The air conditioning primary filter is mainly used for filtering dust particles of 5μm and above, the filtering efficiency is measured by the weighting method, the filtering materials are non-woven fabric, nylon mesh, aluminum wave mesh, stainless steel mesh, etc., the non-woven fabric filter media outlet air surface is treated with a light finishing to prevent the non-woven fibers from breaking and flying apart causing secondary pollution. Next, we will talk about the method of measuring the filtration efficiency of the primary filter - weighting method, weighting method is generally used to measure the low-efficiency filter as a pre-filter in the central air conditioning system, i.e. the primary filter. The relevant standards for the gravimetric test. American Standard: ANSI/ASHRAE 52.1 - 1992 British Standard EN 779 - 1993 Chinese standard: GB 12218 - 1989 The test dust source is generally a large particle size and high concentration of standard dust. The dust is mainly selected, geographically defined floating dust, mixed with a specified amount of fine carbon black and short fibers. The dust used varies from country to country. Chinese standards have provided for the use of village dust of the Loess Plateau, most countries provide for the use of the United States of America Arizona desert zone "route dust (ArizonaRoad Dust), Japanese standards provide for the use of the Japanese origin of the "Kanto Asian sticky Shi". The filtration efficiency of an industrial air filter is the ratio of the amount of dust captured to the original dust content of the air, if it reaches around 80% it reaches G3 efficiency. The test method is to install the filter in a standard test wind tunnel with intermittent dust generation at the upwind end. At regular intervals, the weight of the dust passing through the filter (the amount of dust collected on the filter) is measured to obtain the filter efficiency by the weight of dust at that stage. The final weighted efficiency is a weighted average of the efficiency of each test stage according to the amount of dust generated. At the end of the test, the weight of the test dust contained in the filter is called the "dust capacity". The conditions for termination of the weighted test are the final resistance value agreed upon with the customer, the final resistance value specified by the tester himself, or when there is a significant drop in efficiency. The final resistance value is different. The weighting efficiency value is different. It is important to note that the gravimetric test is destructive and cannot be used for the daily performance testing of the manufacturer. |
