初效过滤器：空气过滤器对气流构成阻力.空气过滤器积灰,阻力添加,当阻力增大到某一阻力值时,空气过滤器报废.新空气过滤器的阻力称"初阻力";对应空气过滤器报废的阻力值称"终阻力".
Air filters form resistance to air flow. Air filters accumulate dust and add resistance. When resistance increases to a certain resistance value, air filters are discarded. The resistance of new air filters is called "initial resistance". The resistance value corresponding to the abandonment of air filters is called "final resistance".
在设计时,常需求一个有代表性的阻力值,以核算系统的风量,这一阻力被称为"设计阻力"是取初阻力与终阻力的平均值.
In design, a representative resistance value is often required to calculate the air volume of the system. This resistance is called "design resistance" which takes the average of initial resistance and final resistance.
终阻力的选择直接关系到空气过滤器的使用寿命、风量.通常情况下,终阻力的选取是工程设计师的事.有经验的工程师能够依据现场状况改动原设计的终阻力值.有的设计师会遗忘通知用户他所选定的终阻力值;有时用户会改换其它型号空气过滤器或其它供给商,这时,工程师不得不自己确定终阻力值.
The selection of final resistance is directly related to the service life and air volume of air filters. Usually, the selection of final resistance is the work of engineers. Experienced engineers can change the final resistance value of the original design according to the site conditions. Some designers will forget to inform users of the final resistance value they have chosen; sometimes users will change other values. At this point, the engineer has to determine the final resistance value for the model air filter or other supplier.
终阻力是初阻力的2到4倍,G3(初效过滤器)的终阻力 100~200PA、G4 在150~250 PA、F5~F6(中效) 250~300PA、F7~F8(高中效) 300~400PA、 F9~H11(亚高效) 400~450、高效与甚高效 400~600PA;
The final resistance is 2 to 4 times of the initial resistance. The final resistance of G3 (primary filter) is 100-200 PA, G4 is 150-250 PA, F5-F6 (intermediate efficiency) 250-300 PA, F7-F8 (high efficiency) 300-400 PA, F9-H11 (sub-high efficiency) 400-450, high efficiency and very high efficiency 400-600 PA.
空气过滤器越脏,阻力越大.过高的终阻力值并不意味着空气过滤器的运用寿命明显提高,但它会使空调系统风量锐减.因而,没有必要将终阻力值定得过高.
The dirtier the air filter is, the bigger the resistance is. Excessive final resistance does not mean that the service life of the air filter is significantly improved, but it will drastically reduce the air volume of the air conditioning system. Therefore, it is not necessary to set the final resistance too high.
低效率空气过滤器常运用直径≥10mm的粗纤维滤料.因为纤维间孔径大,过大的阻力有可能会空气过滤器上的积灰吹散,此时,阻力不再增高,但过滤效率降为零.因而,要严肃限制G4以下空气过滤器的终阻力值.阻力监测每个过滤段都应装置阻力监测装置.终阻力要靠仪表来判定,不能仅凭操作者的感觉.
Low efficiency air filters often use coarse fibre filters with diameters greater than or equal to 10 mm. Because of the large aperture between fibers, excessive resistance may blow away the ash deposited on the air filters. At this time, the resistance will not increase, but the filtration efficiency will drop to zero. Therefore, the final resistance value of air filters below G4 should be strictly limited. Resistance monitoring should be installed in each filter section. Set up resistance monitoring device. The final resistance depends on the instrument, not only on the operator's feeling.
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