初效過(guò)濾器：空氣過(guò)濾器對(duì)氣流構(gòu)成阻力.空氣過(guò)濾器積灰,阻力添加,當(dāng)阻力增大到某一阻力值時(shí),空氣過(guò)濾器報(bào)廢.新空氣過(guò)濾器的阻力稱"初阻力";對(duì)應(yīng)空氣過(guò)濾器報(bào)廢的阻力值稱"終阻力".
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".
在設(shè)計(jì)時(shí),常需求一個(gè)有代表性的阻力值,以核算系統(tǒng)的風(fēng)量,這一阻力被稱為"設(shè)計(jì)阻力"是取初阻力與終阻力的平均值.
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.
終阻力的選擇直接關(guān)系到空氣過(guò)濾器的使用壽命、風(fēng)量.通常情況下,終阻力的選取是工程設(shè)計(jì)師的事.有經(jīng)驗(yàn)的工程師能夠依據(jù)現(xiàn)場(chǎng)狀況改動(dòng)原設(shè)計(jì)的終阻力值.有的設(shè)計(jì)師會(huì)遺忘通知用戶他所選定的終阻力值;有時(shí)用戶會(huì)改換其它型號(hào)空氣過(guò)濾器或其它供給商,這時(shí),工程師不得不自己確定終阻力值.
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.
終阻力是初阻力的2到4倍,G3(初效過(guò)濾器)的終阻力 100~200PA、G4 在150~250 PA、F5~F6(中效) 250~300PA、F7~F8(高中效) 300~400PA、 F9~H11(亞高效) 400~450、高效與甚高效 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.
空氣過(guò)濾器越臟,阻力越大.過(guò)高的終阻力值并不意味著空氣過(guò)濾器的運(yùn)用壽命明顯提高,但它會(huì)使空調(diào)系統(tǒng)風(fēng)量銳減.因而,沒(méi)有必要將終阻力值定得過(guò)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.
低效率空氣過(guò)濾器常運(yùn)用直徑≥10mm的粗纖維濾料.因?yàn)槔w維間孔徑大,過(guò)大的阻力有可能會(huì)空氣過(guò)濾器上的積灰吹散,此時(shí),阻力不再增高,但過(guò)濾效率降為零.因而,要嚴(yán)肅限制G4以下空氣過(guò)濾器的終阻力值.阻力監(jiān)測(cè)每個(gè)過(guò)濾段都應(yīng)裝置阻力監(jiān)測(cè)裝置.終阻力要靠?jī)x表來(lái)判定,不能僅憑操作者的感覺(jué).
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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