weight method and DOP test method
The air filter test weight method is mainly used to calculate the weight of accumulated filtered dust source: the test dust source is standard dust with large particle size and high concentration. The filter is installed in the standard experimental wind tunnel, and the upwind end continuously generates dust. At regular intervals, calculate the weight of dust passing through the filter or the amount of dust collected on the filter, so as to obtain the filtration efficiency of the filter calculated by the weight of dust at this stage. When the agreed final resistance value is reached or the efficiency is significantly reduced, the test shall be terminated. At this time, the weight of the filter containing the test dust becomes the "dust capacity". The final weighing efficiency is the weighted average value of the efficiency in each test stage based on the amount of dust. The "agreement" here refers to the agreement between the customer and the experimenter, or the experimenter's own regulations. Therefore, the weight efficiency value will be different under
different conditions were agreed upon to terminate the test.
The weight method is mainly used to measure the low efficiency filter, such as the initial effect filter, the medium effect filter, generally used in the central air conditioning system pre-filtration. DOP method is a high efficiency filter, and the filtration efficiency measured by different methods may differ greatly. The following table can be used to compare the basic principle, efficiency level, cross-section wind speed, use range and use effect of the weight method and DOP method.
| Weighting Method | DOP Method | |
| Rationale | The weight method is mainly used to measure the low efficiency filter, such as the initial effect filter, the medium effect filter, generally used in the central air conditioning system pre-filtration. DOP method is a high efficiency filter, and the filtration efficiency measured by different methods may differ greatly. The following table can be used to compare the basic principle, efficiency level, cross-section wind speed, use range and use effect of the weight method and DOP methodThe weight method is mainly used to measure the low efficiency filter, such as the initial effect filter, the medium effect filter, generally used in the central air conditioning system pre-filtration. DOP method is a high efficiency filter, and the filtration efficiency measured by different methods may differ greatly. The following table can be used to compare the basic principle, efficiency level, cross-section wind speed, use range and use effect of the weight method and DOP method | Reduce the test dust to 0.3 μ M the DOP droplets of monodisperse phase are heated into steam, which condenses into small droplets under specific conditions, leaving 0.3% after removing too large or too small droplets μ The particles of about M and the foggy DOP enter the air duct, and then measure the turbidity of the gas sample before and after the filter, so as to judge the filter pair of 0.3 μ M dust filtration efficiency, in the early days, people thought that the filter was 0.3 μ M dust is the most difficult to filter, so it is specified to use 0.3 μ M dust measurement high efficiency filter. |
| Efficient Grade | It belongs to medium efficiency filter, which can only reach G4 grade ≥ 90%, which is equivalent to the primary plate filter of air conditioning unit | It belongs to high-efficiency filter, which is much higher than primary plate filter and intermediate bag filter |
| Efficient Grade | 8-10m/s, or even higher. The higher the wind speed, the worse the filtration effect, and the outlet speed of the fan is only 10m/s, so it is difficult to meet the hotel emission standard | 2.5m/s, which is equivalent to the cross-sectional wind speed of the cold coil of the air conditioning box, so it can effectively carry out electrostatic adsorption and deodorization. |
| Scope of use | Weighing method is used to measure low efficiency filters, generally used for prefilters of central air conditioners, and less used in places requiring high filtration such as kitchens | Widely used, Air Conditioner, Industrial, Kitchen room |
| Usage Effect | Low efficiency, filtration equipment is easily blocked, frequiently wash , usage in kitchen, obviously virtual misty, surroundings contamination | Stable efficiency, can achieve visual smoke-free, low emission |
