Filter Rating. Definition: System of classification according to merit or amount Assessment of something in terms of quality, quantity or both What filter parameters should be included? Filter Performance – pressure drop, efficiency, life Energy Perceive Value Cost. Filter Rating.
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α1 = - ln (1 – 0.8)/ 0.40 = 1.609/0.40 = 4.02
α2 = - ln (1 – 0.8)/ 0.30 = 1.609/0.30 = 5.36
α2 = - ln (1 – 0.85)/ 0.40 = 1.897/0.40 = 4.74
Weighted Average = λ1(Efficiency Large Particles) +
λ2(Efficiency Small Particles) + λ3 DHC
λ1 + λ2 + λ3 = 0.6 + 0.3 + 0.1 =1
ability to capture particles 0.3 – 10 µm (E1)