Resistance change of high efficiency filter
Release time:
2020-11-22
high efficiency filterIt is the core equipment of air conditioning purification system. The high efficiency filter creates a step force in the air. With the increase of the amount of dust in the high efficiency filter, the filtering resistance will increase. When there are too many filter workshops and the obstruction force is too large, the air flow through the filter will be reduced, or the filter will be partially penetrated.
Thus, in this case, when the resistance of the high efficiency filter increases to a certain fixed value, the catcher will rotate around the window sill. Proper service life shall be ensured when using restrictors. When the filter is damaged by immersion, the service life of the filter is usually determined by its resistance. The service life of the filter not only depends on its advantages and disadvantages, such as the structural design of the filter material, the initial force, etc. will be affected.
And first of all, depending on the concentration of air in the air, the actual air volume used, the setting of the final force, etc., the following definitions must be understood, first of all, the rated initial exhaust force: at the rated air volume, the initial settlement force provided by the filter sample, the filter characteristic curve or the through-flow inspection report. Design and obstruction force: under the system design air volume, the filtration obstruction force is provided by the air conditioning system designer to carry out the remote initial cooling force to ensure the start of the system.
If there is no pressure measuring instrument, the group force under the instrument air volume can only be used as the initial obstruction force (the actual air volume cannot be completely equal to the design air volume); In the process, check the situation that the filter obstruction force exceeds the initial obstruction force regularly (each source channel should be equipped with force monitoring device) to decide when to replace the filter coating.
Generally speaking,high efficiency filterThe replacement cycle is about one week. Whether more than half of the fresh air inlets pass through the source network and exceed the rated initial resistance by about 60Pa, or the step force exceeds the rated initial resistance by about 80pa within 1-2 months of 2 times of design or operation, or the initial resistance of the intermediate overflow device exceeds the rated initial resistance by about 100Pa for 24 months under 2 × design or operation, or the secondary high overflow device is equal to 2, or design or conduct an initial resistance of 3 times the next highest value of the low group for more than 1 year.
The pre-tightening force of the high filter has exceeded the rated initial resistance force of about 160po, or more than 3 years is equal to 2 times of the designed or carried out initial resistance force. The results show that the low-yield straight-through device generally uses raw silk, and the fiber is exposed to the air with a large blocking force, and the filtering blocking force will not increase, but the filter beam is almost zero. Therefore, the coarse cross-section should be strictly controlled, which is better than the comprehensive resistance of the source filter!
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