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Comparing Dust Collection Efficiency Measurement Methods - Mitsubishi Electric Lossnay series Technical Manual

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CHAPTER 8
Filters
4. Comparing Dust Collection Efficiency Measurement
Methods
The gravitational, colorimetric, and counting methods used for measuring dust collection efficiency each have different features
and must be used according to filter application.
Test Method
Test Dust
Synthetic:
AFI
• Dust on standard
Gravitational
road in Arizona: 72%
method
• K-1 carbon black: 25%
• No. 7 cotton lint: 3%
NBS
Colorimetric
Atmospheric dust
method
DOP
Diameter of dioctyl-
Counting
phthalate small drop
method
particles: 0.01mil (0.3 µm)
Synthetic:
ASHRAE
• Regulated air cleaner
Gravitational
fine particles: 72%
method
• Morocco Black: 23%
• Cotton linter: 5%
ASHRAE
Colorimetric
Atmospheric dust
method
Air filter test for air
conditioning set by
Japan Air Cleaning
JIS 11-type dust
Assoc.
(Colorimetric test)
Pre-filter test set
by Japan Air
Cleaning Assoc.
JIS 8-type dust
(Gravitational
test)
Electrostatic air
cleaning device test
set by Japan Air
JIS 11-type dust
Cleaning Assoc.
(Colorimetric test)
U-78
Inward Flow Dust
Outward Flow Dust
Measurement Method
Measurement Method
• Filter passage air
Dust weight
volume measured
measured
• Weigh the dust
beforehand
remaining on the
filter and compare
Degree of
Degree of
contamination of
contamination of
white filter paper
white filter paper
Electrical counting
measurement using
Same as left
light aimed at DOP
• Filter passage air
Dust weight
volume measured
measured
• Weigh the dust
beforehand
remaining on the
filter and compare
Degree of
Degree of
contamination of
contamination of
white filter paper
white filter paper
Degree of
Degree of
contamination of
contamination of
white filter paper
white filter paper
• Filter passage air
Dust weight
volume measured
measured
• Weigh the dust
beforehand.
remaining on the
filter and compare.
Degree of
Degree of
contamination of
contamination of
white filter paper
white filter paper
Efficiency
Type of Applicable
Indication Method
Gravitational ratio
Synthetic dust filters
Comparison of
Electrostatic dust
contamination of
percentage of
reduction in degree
(for air conditioning)
of contamination
Absolute filter and
Counting ratio
same type of high
efficiency filter
Pre-filter
Filter for air
Gravitational ratio
conditioning
(for coarse dust)
Comparison of
Filter for air
percentage of
conditioning (for fine
reduction in degree
dust) Electrostatic
of contamination
dust collector
Comparison of
percentage of
Filter for air
reduction in degree
conditioning
of contamination
Gravitational ratio
Pre-filter
Comparison of
percentage of
Electrostatic dust
reduction in degree
collector
of contamination
Filters

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