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How to calculate the air volume of high efficiency air filte
How to calculate the air volume of high efficiency air filter
High-efficiency air filters are often used in many environments that require high air cleanliness. Different production workshops will have certain standard requirements for the filtered air volume. So, how to calculate the air volume of the high-efficiency filter?
The air volume of the high-efficiency air filter is generally determined according to the wind speed and size of the high-efficiency filter. Generally, the rated air speed of the high-efficiency air filter is between 0.3-0.6m/s, and the middle value can be 0.45; for example, the 1000 air volume we use is highly efficient. The filter size is 484x484x220 and it is converted. In fact, it can be calculated in this way. Calculated by the national standard 484x484x220 high-efficiency filter, the rated air volume is 1000m³/h, and the initial resistance is 200pa. The number of filter paper is 28 folds/10cm, and the effective area of the filter paper is calculated as 0.475x0.475x0.280x0.2x2=25.27 square meters, of which 0.475 is the effective length of the filter paper, 0.475 is the effective width of the filter paper, and 280 is the double-layered filter paper of one meter. 0.2 is the actual height of the filter paper. The cross-sectional wind speed of the filter paper: 1000/3600/25.27=0.011m/s, that is to say, when the cross-sectional wind speed through the filter paper is 0.011m/s, the initial resistance of the filter paper is 200pa.
Common sizes of HEPA filters and corresponding air volumes
High-efficiency filter with partition
1. The air volume of 610x610x150 is 850~1000m/h
2. The air volume of 484x484x220 is 1000m/h
3. The air volume of 305x610x292 is 850~1000m/h
High-efficiency filter without partition
1. The air volume of 305x305x69 is 250m/h
2. The air volume of 610x610x69 is 850~1000m/h
3. The air volume of 1170x570x69 is 100~1500m/h
The above is an introduction to the calculation method of the air volume of the high-efficiency filter. The air volume of the high-efficiency filter determines the upper limit of the air supply volume, and the air volume filtered by the high-efficiency filter needs to meet the minimum ventilation frequency of the room. We all know that the air volume is too large, the filter is easy to rupture and cause side leakage, and the air volume is too small to meet the production demand.
Therefore, the upper limit of the air volume of the high-efficiency filter is generally 20% of the rated air volume, which needs to be judged according to the actual use of the high-efficiency filter. When comparing the high-efficiency filter, the resistance will gradually increase after a period of time, and the wind speed will decrease. Use when the air volume rises by 10%-20%.
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