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Criteria for the selection of air filter parameters
Criteria for the selection of air filter parametersCriteria for the selection of air filter parameters Air filter efficiency: refers to the weighted average filtration efficiency of an air filter from the time it is put into use to the time it is scrapped after using a certain amount of time;air filter rated use air volume: filters have different resistance under different use air volumes, generally in the selection of filters to be lower than the rated air volume air filter resistance: if it can filter out pollutants, it must produce resistance, and, a qualified filter with the use of The service life of air filter: the actual service life of a filter refers to the use time of the filter to reach a certain resistance under the premise of maintaining the rated efficiency; if a filter is not able to maintain a certain filtration efficiency in the use process, then there is nothing to talk about the service life. Air filter efficiency, the so-called filter classification efficiency, refers to a method of classifying air filter filtration efficiency under the premise of a certain testing method. Different filter testing methods will yield different filter efficiency for the same type of filter, and the classification level will also be different. The efficiency of a filter can only be known through testing. At present, coarse, medium, and high-efficiency filters are generally sealed in good condition, and the efficiency of the finished product is determined according to the efficiency of the filter material provided by the supplier. Sub-high efficiency and high efficiency must be tested the unit by unit, and qualified products can only be shipped. The rated air volume of air filters: The rated air volume is the maximum air volume when the filter reaches the design efficiency. For the selection of the filter, we would like to run it at less than the rated air volume so that its efficiency can be guaranteed to be stable. It should be noted that due to competition in the market, some manufacturers on the market reduce the amount of filter material used to reduce costs. As a result, the resistance of the filter increases, and the filtration efficiency decreases when the rated air volume is reached, which increases the burden on the air supply system and shortens the service life of the main filter. A qualified filter needs to reach the rated air volume with less resistance, so it is necessary to increase the area of the filter media to reach the designed rated air volume with a certain filter speed. Filter resistance, initial resistance: the lower the initial resistance the better for the same requirements: factors influencing the determination of the final resistance of the filter: mechanical strength of the filter; filter replacement cost; power consumption of the filter operating resistance, the permissible range of change in the air volume of the air-conditioning system; change in filtration efficiency. Filter life, the standard way of determining the filter life is to determine the final resistance of the filter by recording the pressure difference between the upper and lower air side of the filter to determine whether the filter is to be replaced. When deciding when to replace the primary and intermediate efficiency air filters in the absence of a differential pressure gauge, the following simple methods can be used to decide whether replacement is necessary: observe the colour of the filter media on the upper and lower air side of the filter, and prepare for replacement if the colour of the filter media on the air outlet side begins to turn black; touch the filter media on the air outlet side with your hand, and prepare for replacement if there is more dust on your hand; record the replacement of the air filter several times to summarise the best Replacement cycle; in the high efficiency filter has not reached the premise of the final resistance, there is a clean room and adjacent room pressure difference significantly decreased, it is possible that the middle efficiency filter resistance is too large, to prepare for replacement; clean room cleanliness can not reach the design requirements, or negative pressure, in the middle efficiency filter did not reach the replacement time, it is possible that the high efficiency filter resistance is too large, to prepare for replacement |
