High efficiency filter scrap this problem is an important problem faced by all users, because only the correct judgement of HEPA filter has been scrapped, in order to do the corresponding filter replacement program, after we collected a total of two cases can determine efficient filter scrap:
One is to do environmental testing, found the room of suspended particles is significantly higher, the exclusion of other causes, dismantling the diffuser plate efficient delivery outlet, the outlet on the surface is damaged, ash traces of black, can not use HEPA filters in this phenomenon, the replacement of the filter in time. If there is no obvious damage to the filter, use the air volume cover to cover the air supply outlet of the room, measure the air supply volume at each air outlet, and increase the air supply rate to replace the air supply.
Two, in the other air filter is no exception, the room air delivery volume is less than half of the standard air supply, indicating that the filter has been blocked, should be blocked HEPA filter replacement.
Efficient filter replacement:
Diffuser plate dismantling scrapped HEPA filter; fixed release HEPA filter, remove the filter, check the static pressure box, the fixed part and the panel has no corrosion and damage, corrosion and rust should be found, painting. According to the specifications and quantity. The new high efficiency filter, high efficiency filter check packaging should be complete, no damage, certificate of HEPA filters should be complete, the frame should be durable, filter without damage; removal of external packaging them in a clean and dry place, the inner packing should be kept intact before installation.
Replace part of HEPA filter clean area, with a static pressure box, clean cloth to clean the filter and then open the filter inner packing seal affixed to the inlet side of the filter, the filter into the smooth handling of static pressure box, a note gently, and record the specifications of HEPA filter type and the number and installation location. When fixing the filter, first check the filter in the middle of the static pressure box, the filter is equal to the distance from the static pressure box, and the fixing parts should be fixed diagonally to prevent the force from uneven or damage the filter. The fixing nut in the static pressure box should be tightened so that the connection between the HEPA filter and the static pressure box is sealed and sealed. Then open the air conditioning unit, ventilation the system, open the high efficiency filter packaging, according to the above steps for replacement.
After installing the HEPA filter, run the system and check for air leakage. When the air leakage is found, do the following: fastening fasteners or replacement seals and re installed, efficient filter itself leakage, then need to replace the new high efficiency filter. Next, install the high efficiency filter panel. When it is installed, install it in the direction marked by the original mark. Minimize the gap between the panel and the ceiling to prevent dust accumulation. After the installation of high efficiency filter, environmental testing should be carried out again and verified, which will provide the most reliable basis for next time to determine the scrap of HEPA filter.
2: efficient filter surface speed, dust content and life of the introduction
Surface speed and filter speed: the capacity of HEPA filter to deal with air flow is usually expressed by surface velocity, and sometimes expressed by filter speed. The two of them are the same for flat filter. Surface velocity refers to the velocity of airflow passing through the filter section, usually expressed as m/s. The filtration rate is defined by the velocity filter area. Due to the high efficiency filter requirements are different, the filter is arranged inside the filter area is also different, sometimes greater than the filter off area and dozens of times. Therefore, the filter speed is smaller than the surface velocity, and is usually expressed in m/min or cm/s. The size of the filter is directly related to the performance of the filter. The high filtration rate will reduce the purification efficiency and increase the resistance; therefore, in order to reduce resistance, the efficiency of the filter is usually very small, and the filter material area is very large.
The quantity of dust dust holding capacity and service life of the air filter is to filter the initial resistance change to end resistance can hold and retain the rated dust quantity, the amount of dust in every 2 meters on the transition area (kg) said. For high efficiency filter, dust holding capacity compared with the general industrial dust collector (such as bag filter) is more important, because the amount of dust collector at rated, often through cleaning the dust adhered to the dust filter on the falling into the ash bucket, decreased resistance, restore to the original state. But for air filters, otherwise, the filter to the rated dust content, you need to take down, cleaning, regeneration (such as foam, filter), and sometimes replace the filter media. Therefore, the size of the dust content determines the life of the filter. The longer the dust holding capacity, the longer the life of the filter, so the dust content is an important performance index to indicate the life of the air filter. The amount of dust and high efficiency filter Du materials relevant, is the ideal material structure transition gradient type structure is the best filter structure is composed of loose transition to intensive, this structure can get large amount of dust, and can achieve the highest efficiency.