恒温恒湿洁净称量室：风速对过滤器的影响
- 发布人：
- 发布日期：2017-06-05 11:47:37
在绝大多数情况下，风速越低，过滤器的运用作用越好。
In most cases, the lower the wind velocity, the better the use of the filter.
小粒径粉尘的分散作用(布朗运动)显着，风速低了，气流在过滤资料中停留的时刻就长一些，粉尘就有更多的时机碰击障碍物，因而过滤功率就高。经历标明，关于高效过滤器，风速削减一半，粉尘的透过率会下降近一个数量级(功率数值添加一个9)，风速添加一倍，透过率会添加一个数量级(功率下降一个 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).
与分散的作用类似，当过滤资料带静电时(驻极体资料)，粉尘在滤材中停留的时刻越长，被资料吸附的可能性就越大。改动风速，带静电资料的过滤功率会显着改动。假如你知道资料上有静电，进行空调体系设计时就应该尽可能地削减经过每只过滤器的风量。
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.
关于以惯性机理为主的大颗粒粉尘，根据传统理论，风速下降后，粉尘与纤维碰撞的概率会削减，过滤功率会随之下降。但在实践中这种影响并不显着，由于风速小了，纤维对粉尘的反弹力也小了，粉尘更简单被粘住。
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.
风速高，阻力就大。假如过滤器的运用寿命以终阻力为根据，风速高，过滤器的运用寿命就短。通常用户很难实践调查到风速对过滤功率的影响，但调查风速对阻力的影响要简单得多。
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.
关于高效过滤器，气流穿过滤材的速度通常在0.01～0.04m/s，在这个范围内，过滤器的阻力与过滤风量呈正比关系。例如，一只484× 484×220mm的高效过滤器，在额外风量1000m3/h下的初阻力为250Pa，假如运用中的实践风量是 500m3/h，它的初阻力可降为125Pa。关于空调箱中的通常通风用过滤器，气流穿过滤材的速度在0.13～1.0m/s范围内，阻力与风量不再是线性关系，而是一条上扬的弧线，风量添加30%，阻力可能会添加50%，若过滤器阻力对你来说是个非常重要的参数，你就要向过滤器供货商索要阻力曲线.
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.
暴露仓,动物气体染毒,pm2.5毒理研究,恒温恒湿洁净称量室 http://www.jukangkj.com/ 等全球先进应用设备请选择巨康科技！
