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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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filter rating
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 rating1
Filter Rating
  • Is it possible to combine filter performance characteristics into one criterion?
    • Greater value of the criterion equal to “better” filter
  • Traditional quality factor (figure of merit):
    • E – filter efficiency and ΔPo – filter pressure drop
    • Potential issues:
      • Different ΔPo units
      • Results at different flow rate
filter rating2
Filter Rating
  • Example 1: E1 = 80% and ΔPo = 0.40” H2O

α1 = - ln (1 – 0.8)/ 0.40 = 1.609/0.40 = 4.02

  • Example 2: E1 = 80% and ΔPo = 0.30” H2O

α2 = - ln (1 – 0.8)/ 0.30 = 1.609/0.30 = 5.36

  • Example 3: E1 = 85% and ΔPo = 0.40” H2O

α2 = - ln (1 – 0.85)/ 0.40 = 1.897/0.40 = 4.74

filter rating3
Filter Rating
  • Single Aggregate Objective Function (AOF)
    • Weighting method, linear AOF:

MAX

    • E – filter efficiency; ΔPo – filter pressure drop
    • C – filter cost; DHC – filter dust holding capacity
    • λ – weighting factors; ∑ λi = λ1 + λ2 + λ3 + λ4=1
    • λ – weighting factors are assigned based on priority - subjective
filter rating4
Filter Rating
  • Combination of objectives:
    • Other objectives: Cost,

Energy

filter rating examples
Filter Rating - Examples
  • MERV – is MERV a rating system?
  • Residential filters – Home Depot
      • FPR (Filter Performance Rating) = 1 – 10 scale

Weighted Average = λ1(Efficiency Large Particles) +

λ2(Efficiency Small Particles) + λ3 DHC

λ1 + λ2 + λ3 = 0.6 + 0.3 + 0.1 =1

    • FPR = 10 for Weighted Average > 25
  • Residential filters – 3M
      • MPR – Microparticle Performance Rating

ability to capture particles 0.3 – 10 µm (E1)