ISO 29461-1:2013 回転機械用エアインテークフィルターシステム—試験方法—パート1：静的フィルターエレメント | ページ 6

3.2.1

フィルター面速度

空気流量をフィルター面の面積で割った値

[出典: 出典: ISO 29464:2011, 3.1.84]

3.2.2

媒体速度

気流率を有効ろ過面積で割った値

注記1:有効数字3桁の精度で表される。

3.1

test airflow rate

volumetric airflow rate used for testing

[SOURCE: Source: ISO 29464:2011; 3.1.106]

3.3.1

particulate efficiency

percentage particulate removal efficiency of the filter at specified particle sizes measured with a particle counter in the range of 0,3 µm to 3,0 µm

3.3.2

initial efficiency

particulate efficiency of the clean filter operating at the test airflow rate

Note 1 to entry: A clean filter is a filter not exposed to any test aerosol or substance prior to the efficiency test.

3.3.3

minimum efficiency

lowest particulate efficiency of initial, conditioned or dust loaded efficiencies

3.3.4

conditioned efficiency

efficiency of the conditioned filter media (per Annex A) operating at an average media velocity corresponding to the test airflow rate in the filter

3.3.5

gravimetric efficiency

A₅₀

weighted (mass) removal of loading dust after 50 g of dust load

3.3.6

average gravimetric efficiency

A_avg

ratio of the total amount of loading dust retained by the filter to the total amount of dust fed up to final test pressure drop

3.3.7

dust loaded efficiency

efficiency of the filter operating at test flow rate and after dust loadings up to final test pressure differential

3.4

penetration

ratio of the particle concentration detected downstream versus the concentration upstream of the filter

3.5.1

initial pressure drop

pressure drop of the clean filter operating at the test airflow rate

3.5.2

final test pressure drop

maximum pressure drop of the filter up to which the filtration performance is measured

3.5.3

final test pressure drop – recommended

maximum operating pressure drop of the filter as recommended by the manufacturer at rated airflow

3.6.1

filter face area

frontal face area of the filter including the header frame

[SOURCE: Source: ISO 29464:2011, 3.1.83]

Note 1 to entry: Typical nominal values: 0,610 m × 0,610 m (24 in × 24 in).

3.6.2

effective filtering area

area of filter medium in the filter which collects dust

[SOURCE: Source: ISO 29464:2011; 3.1.79]

3.7.1

static filter

air filter that will be removed (exchanged) after it has reached its final test pressure drop and that is not cleaned with jet pulses or other means in order to fully, or partially, retrieve its initial performance (pressure drop and efficiency)

3.7.2

pulse jet filter

cleanable air filter, that typically is cleaned with air jet pulses to provide a longer service life

3.7.3

surface loading filter

filter in which the dust is collected on the surface of the filter medium

3.7.4

depth loading filter

filter in which particles penetrate into the filter medium and are collected on the fibres in the depth of the filter medium

3.7.5

low efficiency filter

air filter with an initial particulate efficiency at 0,4 µm particles in the range E < 35 %

3.7.6

medium efficiency filter

air filter with an initial particulate efficiency at 0,4 µm particles in the range 35 % ≤ E ≤ 85 %

3.7.7

high efficiency filter

air filter with an initial particulate efficiency at 0,4 µm particles in the range E ≥ 85 %

3.7.8

EPA filter

air filter with a particulate efficiency at most penetrating particle size (MPPS) in the range 85 % ≤ E ≤ 99,95 % (typically 0,05 µm to 0,3 µm size range)

3.7.9

final filter

air filter used to collect the loading dust passing through or shedding from the filter under test

[SOURCE: Source: ISO 29464:2011; 3.1.86]

3.7.10

charged filter

filter in which the medium is electrostatically charged or polarized

[SOURCE: Source: ISO 29464:2011; 3.1.75]

3.7.11

untreated filter

air filter not submitted to conditioning per Annex A

3.8.1

test aerosol

aerosol used for determining the particulate efficiency of the filter

3.8.2

particle size

geometric diameter (equivalent spherical, optical or aerodynamic, depending on the context) of the particles of an aerosol

[SOURCE: Source: ISO 29464:2011; 3.1.126]

3.8.3

mean diameter

geometric mean value of the upper and lower border diameters in a size range

3.8.4

particle number concentration

number of particles per unit volume of air

3.8.5

neutralization

action of bringing the aerosol to a Boltzmann charge equilibrium distribution with bipolar ions

3.9.1

loading dust

synthetic test dust

synthetic dust formulated specifically for determination of the test dust capacity and arrestance of air filters

3.9.2

test dust capacity

dust loading capacity

TDC

amount of loading dust held by the filter at final test pressure drop

3.10.1

isokinetic sampling

technique for air sampling such that the probe inlet air velocity is the same as the velocity of the air surrounding the sampling point

[SOURCE: Source: ISO 29464:2011; 3.1.144]

3.10.2

counting rate

number of counting events per unit time

[SOURCE: Source: ISO 29464:2011; 3.1.41]

3.10.3

correlation ratio

downstream particle concentration divided by the upstream particle concentration (measured without filter)

[SOURCE: Source: ISO 29464:2011; 3.1.26]

3.11.1

shedding

release to the airflow of particles due to particle bounce and re-entrainment effects and to the release of fibres or particulate matter from the filter or filtering material

[SOURCE: Source: ISO 29464:2011; 3.1.150]

3.11.2

particle bounce

behaviour of particles that impinge on the filter without being retained

[SOURCE: Source: ISO 29464:2011; 3.1.121]

3.11.3

re-entrainment

release to the airflow of particles previously collected on the filter

[SOURCE: Source: ISO 29464:2011; 3.1.142]