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无尘洁净室装修的种类很多,那么电子净化工程中洁净室的原理是什么呢?下面就由山东净之源净化工程公司为大家介绍几点。
乱流洁净室的原理和特性
⑴定义
乱流洁净室是:气流以不均匀的速度呈不平行流动,伴有回流或涡流的洁净室。
⑵原理
乱流洁净室靠送风气流不断稀释室内空气,把室内污染逐渐排出,达到平衡。要想保证稀释作用很好实现,重要一点是室内气流扩散得赶快越均匀越好。
换气次数的作用是保证有足够进行稀释的干净气流。
换气次数的多少应根据计算和经验确定。
②气流组织
气流组织的作用是保证能均匀地送风和回风,充分发挥干净气流的稀释作用。因此要求单个风口有足够的扩散作用,全室回风布置均匀,数量多一些好,要尽量减少涡流和气流回旋。
③自净时间
自净时间是洁净室从污染状态回复到稳定状态的能力的体现,越短越好。也可以指定为从某污染状态降低到某洁净状态的时间。
乱流洁净室的自净时间一般不超过30min。
单向流洁净室靠送风气流“活塞”般的挤压作用,迅速把室内污染排出。
要保证活塞作用的实现,重要一点是高效过滤器必须满布。当然,过滤器是有边框的,顶棚也有边框,不可能....地满布过滤器。
正常情况下满布比达到80%。垂直单向流满布比不应小于60%,水平单向流应小于40%,否则就是局部单向流了。