高效滤网

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HEPA過濾器的功能描述

高效滤网英语:High-Efficiency Particulate Air,即高效率空氣微粒子過濾網,簡稱HEPA[1][2])是一种用于空气净化的器材。 符合HEPA標準的過濾器的用途很廣泛,從醫療設備、汽車、飛機及家居均可應用。 截经过滤网的空气中所含有的微小尘埃。濾網的標準由美國能源部設定,对粒径在0.3μm的粒子, 過濾效果約為DOP 99.97%以上。通常使用的高效滤网可达到99.99%的拦截效率,也有更高或相对低一些的品种,各国有相应的规格标准。高效濾網的過濾材質通常由无规则排布的化学纤维(例如:聚丙烯纤维丙纶聚酯纤维涤纶无纺布)或玻璃纤维制成,直徑約0.5到2.0微米,通过微观的絮状结构,主要是用來去除0.5µm以上之微粒。

同样被使用于空气净化的滤网,按过滤效率由低至高,命名为粗效滤网中效滤网亚高效滤网及比高效滤网還要高的超高效滤网

技术规格[编辑]

A portable HEPA filtration unit used to clean air after a fire, or during manufacturing processes.

根据美国能源部(DOE, United States Department of Energy)公布,且为大多数美国工业部门采纳的标准,HEPA滤网应当至少过滤99.97%的,直径不小于0.3微米(µm)的空气中的颗粒。 滤网的最小气流阻力,或者压降英语pressure drop,通常规格为在其标称流量下,为300帕斯卡

欧盟国家中,该技术规范通常也以欧洲标准化委员会英语European Norm以EN 1822:2009.呈现。其根据最易穿透粒径的过滤效果(MPPS),定义了HEPA滤网的几类等级:

HEPA等级 retention (total) retention (local)
E10 > 85% ---
E11 > 95% ---
E12 > 99.5% ---
H13 > 99.95% > 99.75%
H14 > 99.995% > 99.975%
U15 > 99.9995% > 99.9975%
U16 > 99.99995% > 99.99975%
U17 > 99.999995% > 99.9999%

Today, a HEPA filter rating is applicable to any highly efficient air filter that can attain the same filter efficiency performance standards as a minimum and is equivalent to the more recent NIOSH N100 rating for respirator filters. The United States Department of Energy (DOE) has specific requirements for HEPA filters in DOE regulated applications. In addition, companies have begun using a marketing term known as "True HEPA" to give consumers assurance that their air filters are indeed certified to meet the HEPA standard.[3]

Products that claim to be "HEPA-type", "HEPA-like", "HEPA-style" or "99% HEPA" do not satisfy these requirements and may not have been tested in independent laboratories. Some of these sub-par quality filters may come reasonably close to HEPA filtration, while others will fall significantly short, making them truly inferior.[4]

采用HEPA標準的家居物品[编辑]

參考資料[编辑]

  1. ^ HEPA Company glossary of terms
  2. ^ Originally 'High Efficiency Particulate Arrestment - see thefreedictionary.com
  3. ^ Should A True HEPA Filter Mean Anything To You?
  4. ^ HEPA-type filter: The Great Pretender
  5. ^ 5.0 5.1 殺死塵蹣的好辦法 (中文(繁體)‎). 

參見[编辑]

外部連結[编辑]