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    如何合理确定各级空气过滤器?
    一般情况下,最末一级空气过滤器决定送风的洁净程度,上游各级空气过滤器起保护作用,它保护下风端空气过滤器以延长其使用寿命,或保护空调系统以确保其正常工作。
    设计时,应首先根据送风的洁净要求确定末级空气过滤器的效率,然后选择起保护作用的空气过滤器(预过滤器),如果这级空气过滤器亦需保护,再在它的上风端增设过滤器。应妥善匹配各级空气过滤器的效率,若相邻两级的效率相差太大,则前一级直不到保护后一级的作用。

    使用欧洲“G~F~H~U”效率规格分类时,可每隔2~4档设置一级过滤器。例如:G3→F5→F8→H12,其中,末端H12高效过滤器决定送风的洁净水平,F8保护H12,F5保护F8,G3保护F5。

    选择预空气过滤器时要将使用环境、备件费用、运行能耗、维护与供货等因素综合考虑后决定。特别地,洁净室末端高效(HEPA)空气过滤器前要有效率规格不低于F8中效过滤器来保护;甚高效(ULPA)空气过滤器前可选用F9中效过滤器~H11的空气过滤器。空调系统本身应有效率规格不低于F5中效过滤器来保护。在无风沙、低污染地区,F7中效过滤器前可不设预过滤器;在城市的空调系统中,目前常见的初效过滤器是G3~F6。

    确定空气过滤器效率的要点是:末级空气过滤器的性能要可靠,预过滤器的效率规格要合理,初效过滤器和预过滤器的维护要方便。

    推荐阅读初效空气过滤器??中效空气过滤器??高效空气过滤器

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