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Reasonable determination of filter efficiency at all levels

Reasonable determination of filter efficiency at all levels
In general, the last filter determines the degree of air purification. The upper levels of filters only protect the lower wind end filters to extend their service life or to protect the air-conditioning system to ensure its normal operation. In the air conditioning design, the efficiency of the last filter should first be determined according to the user's cleanliness requirements, and then the protection filter should be selected. If this filter also needs to be protected, add a filter to its upper wind end. In this way, the filters that play a protective role are collectively referred to as "pre-filters." In addition, the efficiency of the filters at all levels should be reasonably matched: if the efficiency specifications of the adjacent two-level filters are too different, the previous level will not play a role in the post-protection level; If there is not much difference between the two levels, the burden on the latter level is too small.
When using the "G ~ F ~ H ~ U" efficiency specification classification, it is convenient to estimate the efficiency of the required filters at all levels. In G2 to H12, a primary filter is set every 2 to 4 files. For example: G4 → F7 → H10, where the end H10(sub-efficient) filter determines the level of cleanliness of the air, F7 protects H10, and G4 protects F7.
Clean room end high efficiency(HEPA) filter must be protected by a filter with an efficient specification of no less than F8; High-efficiency(ULPA) filters can be used before F9 to H11 filters. The central air conditioning itself should be protected by a filter with an efficient specification not less than F5.
In the absence of sand and low pollution areas, there can be no pre-filter before the F7 filter; In the city's central air-conditioning system, G3-F6 is a common primary filter. In specific engineering applications, what efficiency level pre-filters are used to protect the latter filter, which requires a combination of factors such as the use environment, spare parts costs, operating energy consumption, and maintenance costs.
Examples of the application of efficiency filters at all levels:
1) A certain 100 cleanliness room, set F5 → F8 → H10 → H13 filter, end H13 filter used for 8 years;
2) Only F5 filters are protected in front of a clean room high-efficiency filter, and users must replace high-efficiency filters every year;
3) The filter in a new wind purification system in a heavily polluted city is set to G3 → H10, and the H10 filter is scrapped after half a month of system operation;
4) A car spray paint line, the filter set to G3 → F6 → F5. Among them, the end F5 is a filter material covered with roofs, and it only acts as an equalizer of process requirements; F6 determines the level of purification of the air supply.

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Add: Chengdu Gaoxin West District Science and Technology Park

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