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The filter forms resistance to the air flow, the filter accumulates dust, and the resistance increases. When the resistance increases to a certain value, the filter is scrapped. The resistance of the new filter is called "initial resistance", and the resistance value corresponding to the filter scrap is called " "Final resistance", when designing, a representative resistance value is often required to calculate the design air volume of the system. This resistance is called "design resistance". The usual method is to take the average of the initial resistance and the final resistance.
The selection of the final resistance is directly related to the service life of the filter, the range of the system air volume, and the energy consumption of the system. Generally, the selection of the final resistance is the responsibility of the air-conditioning designer. Experienced engineers can change the final design of the original design according to the site conditions. The resistance value, some designers will forget to tell the user the final resistance value he has selected, and sometimes the user will change to another type of filter. At this time, the field engineer has to determine the final resistance value by himself. In most cases, the final resistance is the initial value. The resistance is 2-4 times. The dirtier the filter is, the faster the resistance increases. An excessively high final resistance value does not mean that the service life of the filter will be significantly prolonged, but it will reduce the air volume of the air conditioning system sharply, so it is not necessary. The final resistance value is set too high. Low-efficiency filters often use coarse fiber filters with a diameter of 10um or more. Due to the large fiber gap, excessive resistance may blow away the dust on the filter. At this time, the resistance is not Increased again, but the filtration efficiency dropped to zero. Therefore, the final resistance value of filters below G4 must be strictly limited.
Each filter section should be equipped with resistance monitoring device. The final resistance is determined by the instrument. It can not be based on the feeling of operation. The cheapest resistance monitoring device is U-tube differential pressure meter, inclined tube differential pressure meter and curved tube differential pressure. The design is more beautiful, the differential pressure gauge is higher and the price is higher. In addition, there is a differential pressure transmitter that changes the resistance into an electrical signal. In addition to the resistance monitoring device that can read, a final resistance alarm device should be added to save trouble. The method is to draw a red bar on the differential meter, and the safe way is to use a differential pressure switch.
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