恒溫恒濕潔凈稱量室：風速對過濾器的影響
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- 發布日期：2017-06-05 11:47:37
在絕大多數情況下，風速越低，過濾器的運用作用越好。
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(布朗運動)顯著，風速低了，氣流在過濾資料中停留的時刻就長一些，粉塵就有更多的時機碰擊障礙物，因而過濾功率就高。經歷標明，關于高效過濾器，風速削減一半，粉塵的透過率會下降近一個數量級(功率數值添加一個9)，風速添加一倍，透過率會添加一個數量級(功率下降一個 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，當過濾資料帶靜電時(駐極體資料)，粉塵在濾材中停留的時刻越長，被資料吸附的可能性就越大。改動風速，帶靜電資料的過濾功率會顯著改動。假如你知道資料上有靜電，進行空調體系設計時就應該盡可能地削減經過每只過濾器的風量。
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.
關于以慣性機理為主的大顆粒粉塵，根據傳統理論，風速下降后，粉塵與纖維碰撞的概率會削減，過濾功率會隨之下降。但在實踐中這種影響并不顯著，由于風速小了，纖維對粉塵的反彈力也小了，粉塵更簡單被粘住。
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.
風速高，阻力就大。假如過濾器的運用壽命以終阻力為根據，風速高，過濾器的運用壽命就短。通常用戶很難實踐調查到風速對過濾功率的影響，但調查風速對阻力的影響要簡單得多。
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.
關于高效過濾器，氣流穿過濾材的速度通常在0.01～0.04m/s，在這個范圍內，過濾器的阻力與過濾風量呈正比關系。例如，一只484× 484×220mm的高效過濾器，在額外風量1000m3/h下的初阻力為250Pa，假如運用中的實踐風量是 500m3/h，它的初阻力可降為125Pa。關于空調箱中的通常通風用過濾器，氣流穿過濾材的速度在0.13～1.0m/s范圍內，阻力與風量不再是線性關系，而是一條上揚的弧線，風量添加30%，阻力可能會添加50%，若過濾器阻力對你來說是個非常重要的參數，你就要向過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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