恒溫恒濕潔凈稱量室：風(fēng)速對(duì)過(guò)濾器的影響
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- 發(fā)布日期：2017-06-05 11:47:37
在絕大多數(shù)情況下，風(fēng)速越低，過(guò)濾器的運(yùn)用作用越好。
In most cases, the lower the wind velocity, the better the use of the filter.
小粒徑粉塵的分散作用(布朗運(yùn)動(dòng))顯著，風(fēng)速低了，氣流在過(guò)濾資料中停留的時(shí)刻就長(zhǎng)一些，粉塵就有更多的時(shí)機(jī)碰擊障礙物，因而過(guò)濾功率就高。經(jīng)歷標(biāo)明，關(guān)于高效過(guò)濾器，風(fēng)速削減一半，粉塵的透過(guò)率會(huì)下降近一個(gè)數(shù)量級(jí)(功率數(shù)值添加一個(gè)9)，風(fēng)速添加一倍，透過(guò)率會(huì)添加一個(gè)數(shù)量級(jí)(功率下降一個(gè) 9)。
The dispersion of small size dust (Brown) significantly, low wind speed, air flow in the filter data to stay time is longer, the dust will have the opportunity to hit more obstacles, thus high power filter. Experience shows that, on the high efficiency filter, wind speed cut in half, dust through rate will decline by nearly an order of magnitude (the power value add a 9), the wind speed doubled, the transmittance will add a magnitude (a power reduction of 9).
與分散的作用類似，當(dāng)過(guò)濾資料帶靜電時(shí)(駐極體資料)，粉塵在濾材中停留的時(shí)刻越長(zhǎng)，被資料吸附的可能性就越大。改動(dòng)風(fēng)速，帶靜電資料的過(guò)濾功率會(huì)顯著改動(dòng)。假如你知道資料上有靜電，進(jìn)行空調(diào)體系設(shè)計(jì)時(shí)就應(yīng)該盡可能地削減經(jīng)過(guò)每只過(guò)濾器的風(fēng)量。
Similar to the role of dispersion, when the filter data is electrostatic (electret material), the longer the dust stays in the filter material, the greater the probability of adsorption by the data. If the wind speed is changed, the filtration power with electrostatic data will be significantly changed. If you know that there is static electricity in the data, you should cut down the air flow through each filter as much as possible when designing the air conditioning system.
關(guān)于以慣性機(jī)理為主的大顆粒粉塵，根據(jù)傳統(tǒng)理論，風(fēng)速下降后，粉塵與纖維碰撞的概率會(huì)削減，過(guò)濾功率會(huì)隨之下降。但在實(shí)踐中這種影響并不顯著，由于風(fēng)速小了，纖維對(duì)粉塵的反彈力也小了，粉塵更簡(jiǎn)單被粘住。
According to the traditional theory, the probability of collision between dust and fiber will be reduced and the power of filtration will decrease when the wind speed drops. But in practice, this effect is not significant, because the wind speed is small, the fiber's resilience to dust is also small, and the dust is simpler to be stuck.
風(fēng)速高，阻力就大。假如過(guò)濾器的運(yùn)用壽命以終阻力為根據(jù)，風(fēng)速高，過(guò)濾器的運(yùn)用壽命就短。通常用戶很難實(shí)踐調(diào)查到風(fēng)速對(duì)過(guò)濾功率的影響，但調(diào)查風(fēng)速對(duì)阻力的影響要簡(jiǎn)單得多。
The wind speed is high and the resistance is great. If the service life of the filter is based on final resistance and the wind speed is high, the service life of the filter will be short. Generally, it is difficult for users to investigate the effect of wind speed on filtering power, but it is much simpler to investigate the effect of wind speed on resistance.
關(guān)于高效過(guò)濾器，氣流穿過(guò)濾材的速度通常在0.01～0.04m/s，在這個(gè)范圍內(nèi)，過(guò)濾器的阻力與過(guò)濾風(fēng)量呈正比關(guān)系。例如，一只484× 484×220mm的高效過(guò)濾器，在額外風(fēng)量1000m3/h下的初阻力為250Pa，假如運(yùn)用中的實(shí)踐風(fēng)量是 500m3/h，它的初阻力可降為125Pa。關(guān)于空調(diào)箱中的通常通風(fēng)用過(guò)濾器，氣流穿過(guò)濾材的速度在0.13～1.0m/s范圍內(nèi)，阻力與風(fēng)量不再是線性關(guān)系，而是一條上揚(yáng)的弧線，風(fēng)量添加30%，阻力可能會(huì)添加50%，若過(guò)濾器阻力對(duì)你來(lái)說(shuō)是個(gè)非常重要的參數(shù)，你就要向過(guò)濾器供貨商索要阻力曲線.
With regard to HEPA filters, the velocity of the airflow through the filter medium is usually between 0.01 and 0.04m/s. In this range, the resistance of the filter is proportional to the filtered air flow. For example, a 484 * 484 * 220mm HEPA filter with an initial resistance of 250Pa at an additional air volume of 1000m3/h, and if the applied air volume is 500m3/h, its initial resistance can be reduced to 125Pa. About the air conditioning box usually ventilation airflow through the filter, filter speed in the range of 0.13 ~ 1.0m/s, resistance and air flow is not linear, but a rising curve, air resistance may add 30%, add 50%, if the filter resistance to you is a very important parameter, you have to the supplier for filter resistance curve.
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