| Filtering common sense |
| Let the quantity of dust |
| 2008-10-27 15:30:32 |
| (has been browse 810 times) |
| Let the quantity of dust in the specific test conditions, the filters to accommodate specific weight of the artificial dust. The so-called "specific" refers to: a. standards for wind tunnel tests, as well as related test and measurement equipment; b. dust particles in the atmosphere than the standard artificial much dust; c. standards, or with clients to test the agreed method of calculation and test methods; d. commissioned to test and agreed to terminate the test. Only in the test conditions at the same time, in order to allow accordance with the quantity of dust to which only a rough estimate of the useful life of the filter will be longer than the other. "Let the quantity of dust" and the actual filter to accommodate the weight of dust there is no direct correlation, isolation, "Let the quantity of dust" of the user data does not make sense. For example, a trap trials capacity for the quantity of dust 600g, it may be scrapped to accommodate 2.5kg of dust in the atmosphere; other capacity for the quantity of dust 900g, to your hands, it could only 1.5kg Douzhu dust . Filter manufacturers and laboratories in the professional assessment of the general ventilation filter products, to filter dust made to carry out destructive testing, its main purpose is to assess the filter throughout the course of the trial, the average efficiency. Yung is the quantity of dust in this trial received a set of data in the data. If a laboratory had carried out a large number of filter dust-fat test, test can be used to allow a group of dust compared to the amount of data related to the filter. Let those foreigners is difficult to understand the real meaning of the quantity of dust. European and American standards for the majority of the termination of the trial on condition that: ① to meet resistance at the beginning of resistance to 2 hours or more times; ② instantaneous efficiency filtration efficiency of the highest value of less than 85% of the time. Most of the filters will not reduce the efficiency, it is just the fluffy fiber (≥ 10mm) made the following G3 and G4 a small number of filters may happen because the gap between the fibers too, could pocket dust. When the conditions for the termination of the "resistance in the early times of 2 or higher," to the problem. The higher the resistance, the filter of the more dust, the greater the amount of dust capacity. 2 times that of all the provisions are not fair, better than only the beginning of low-resistance divertor to lose. Therefore, the client and those who want to terminate the pilot test. If the termination of the pilot's condition is not clear, there is no data on the quantity of dust capacity of any significance. Europe Eurovent4 / 9 standards for the termination of the test for resistance 450Pa, the data is much higher than 2 times the resistance at the beginning. China does not require standards of "efficiency" filters for dust-fat test. When two people discuss the quantity of dust capacity, you have to know each other's country, then what is right. Europe and the United States standard Experimental artificial Ashrae dust is dust, the main ingredient for the Arizona desert dust in a particular place (Arizona Road Dust, and translation of the "road dust"), and mixed with the provisions of the proportion of fine carbon black and short fibers. Japan provides its own "road dust", its physical and chemical properties similar to dust and the United States. 80, the Beijing Architectural Design Institute of Metallurgical come up with Ai-Fang Liu of China's own "road dust", the main ingredients for a village of floating dust in Yan'an, China also has a number of related standards. 10 years or so, her group produced a total of less than 500 kg of artificial dust, most of them for dust removal device testing, only two filter manufacturing plant bought her 50 kg artificial dust, at best, can do 100 dust-fat test . In 1995, Liu retired old woman, then she set dust production equipment no longer turn-off. Allow users to a chilling inference: 20 years, all the filters made by the factory made 100 times less than dust test! This re-order derivative of a manufacturing plant, and the experts infer that the blush: They say "Let the quantity of dust," the data is mostly fabricated! |
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