ISO 10121-3:2022 一般換気用の気相空気清浄媒体および装置の性能を評価するための試験方法 — Part 3: 外気の処理に適用される GPACD の分類システム | ページ 6

3.1

adsorption

process in which the molecules of a gas (3.14) or vapour adhere by physical or chemical processes to the exposed surface of solid substances, both the outer surface and inner pore surface, with which they come into contact

[SOURCE:ISO 29464:2017, 3.5.7]

3.2

adsorbate

molecular compound in gaseous or vapour phase that may be retained by an adsorbent (3.3) medium

[SOURCE:ISO 29464:2017, 3.5.3]

3.3

adsorbent

material having the ability to retain gaseous or vapour contaminants (3.10) on its surface by physical or chemical processes

[SOURCE:ISO 29464:2017, 3.5.4]

3.4

ambient pressure

absolute barometric pressure immediately outside the test rig

[SOURCE:ISO 29464:2017, 3.5.50, modified — The word “barometric” has been added.]

3.5

adsorbate capacity

m_s

maximum amount (mass or moles) of a selected adsorbate (3.2) that can be contained in GAPC medium or device under given test conditions and a specific end point (termination time)

Note 1 to entry: Capacity can also be negative during desorption (3.11) .

[SOURCE:ISO 29464:2017, 3.5.12, modified — The symbol m_s and the words “maximum” and “a specific” have been added.]

3.6

challenge air stream

test contaminant(s) (3.10) of interest diluted to the specified concentration(s) (3.9) of the test prior to filtration

[SOURCE:ISO 29464:2017, 3.5.13]

3.7

challenge concentration

concentration (3.9) of the test contaminant(s) (3.10) of interest in the air stream prior to filtration [ challenge air stream (3.6) ]

[SOURCE:ISO 29464:2017, 3.5.14]

3.8

challenge compound

chemical compound that is being used as the contaminant (3.10) of interest for any given test

[SOURCE:ISO 29464:2017, 3.5.15]

3.9

concentration

C_n

quantity of one substance dispersed in a defined amount of another

Note 1 to entry: Indices “n” denote location.

[SOURCE:ISO 29464:2017, 3.1.7, modified — The symbol C_n and Note 1 to entry have been added.]

3.10

contaminant

substance [solid, liquid or gas (3.14) ] that negatively affects the intended use of a fluid

[SOURCE:ISO 29464:2017, 3.1.8, modified — The alternative term “pollutant” has been removed.]

3.11

desorption

process in which adsorbate (3.2) molecules leave the surface of the adsorbent (3.3) and re-enter the air stream

Note 1 to entry: Desorption is the opposite of adsorption (3.1) .

[SOURCE:ISO 29464:2017, 3.5.21]

3.12

downstream

area or region into which fluid flows on leaving the GPACD (3.15)

[SOURCE:ISO 29464:2017, 3.1.11, modified — “GPACD” has been used instead of “test device”.]

3.13

face velocity

volumetric air flow rate divided by the nominal GPACD face area (3.16)

Note 1 to entry: GPACD (3.15) face velocity is expressed in m/s.

[SOURCE:ISO 29464:2017, 3.1.15, modified — The alternative term “filter face velocity” has been removed; “GPACD face area” and “GPACD face velocity” have been used instead of “filter face area” and “filter face velocity”.]

3.14

gas

substance whose vapour pressure is greater than the ambient pressure (3.4) at ambient temperature

[SOURCE:ISO 29464:2017, 3.1.28]

3.15

gas-phase air cleaning device

GPACD

assembly of a fixed size enabling the removal of specific gas- or vapour-phase contaminants (3.10)

Note 1 to entry: It is normally box shaped or fits into a box of dimensions between 290 mm × 290 mm × 290 mm up to approximately 610 mm × 610 mm × 610 mm or 2 ft × 2 ft × 2 ft.

[SOURCE:ISO 29464:2017, 3.5.32, modified — The box dimensions in note 1 to entry have been modified.]

3.16

GPACD face area

nominal cross-sectional area of the GPACD (3.15)

Note 1 to entry: For the purpose of standardizing measurements, the nominal area is calculated using 610 mm × 610 mm for a full-size filter, 610 mm × 305 mm for a half-size filter and 305 mm × 305 mm for a quarter size filter.

3.17

heavy duty

HD

duty level (specific dose) of a contaminant (3.10) that corresponds to a removal efficiency (3.29) versus dose performance for a GPACD (3.15) that is used in challenging environments (e.g. heavily polluted environments)

3.18

initial dose

D_i

mass per GPACD face area (3.16) that reaches a GPACD (3.15) calculated from air flow in (volume per time), time, pollution concentration (3.9) (mass per volume) and GPACD face area during the test phase for determination of the initial efficiency (3.19)

3.19

initial efficiency

E_i

removal efficiency (3.29) of an unexposed filter or GPACD (3.15) calculated as soon as possible after the start of a test

Note 1 to entry: For gas-phase, this should be calculated as soon as a steady reading can be obtained.

3.20

integrated removal efficiency

E_Σ

numerically integrated fraction or percentage of a challenge contaminant (3.10) that is removed by a GPACD (3.15) over a specified time or dose period

3.21

light duty

LD

duty level (specific dose) of a contaminant (3.10) that corresponds to a removal efficiency (3.29) versus dose performance for a GPACD (3.15) that is used as an entry level solution, for low concentrations (3.9) or intermittent contamination episodes

3.22

medium duty

MD

duty level (specific dose) of a contaminant (3.10) that corresponds to a removal efficiency (3.29) versus dose performance for a GPACD (3.15) that is used for medium concentrations (3.9) of contamination

3.23

molecular contamination

contamination present in gas (3.14) or vapour phase in an air stream and excluding compounds in particulate (solid) phase regardless of their chemical nature

[SOURCE:ISO 29464:2017, 3.5.40]

3.24

normalised dose

D_N

mass per GPACD face area (3.16) that reaches a GPACD (3.15) calculated from air flow in (volume per time), time, pollution concentration (3.9) (mass per volume) and GPACD face area

3.25

normalised retentivity

R

measure of the ability of an adsorbent (3.3) or GPACD (3.15) to resist desorption (3.11) of an adsorbate (3.2) per GPACD face area (3.16)

Note 1 to entry: Computed as the residual capacity (fraction remaining) after purging the adsorbent with clean, conditioned air only, following challenge breakthrough and expressed per GPACD face area (3.16) .

[SOURCE:ISO 29464:2017, 3.5.53, modified —"normalised" has been added in the term, the symbol R has been added,"per GPACD face area" has been added in the definition,"and expressed per GPACD face area" has been added in Note 1 to entry.]

3.26

ppb(v)

parts per billion by volume

concentration (3.9) measure normally used to record ambient levels of outdoor pollution

Note 1 to entry: Units are mm³/m³.

[SOURCE:ISO 29464:2017, 3.5.43, modified —"parts per billion by volume" has been moved from the definition to the admitted term.]

3.27

ppm(v)

parts per million by volume

concentration (3.9) measure normally used to record pollution levels in, e.g. work place safety

Note 1 to entry: Units are cm³/m³ and ml/m³.

[SOURCE:ISO 29464:2017, 3.5.44, modified —"parts per million by volume" has been moved from the definition to the admitted term.]

3.28

pressure drop

Δp

difference in absolute (static) pressure between two points in an airflow system

Note 1 to entry: In this document, pressure drop is measured between points upstream and downstream (3.12) of the GPACD (3.15) .

[SOURCE:ISO 29464:2017, 3.1.36, modified — The alternative terms"resistance to air flow“,"differential pressure" and"pressure differential" have been removed; the symbol Δp has been added; and “airflow system" has been used instead of"a system"; the original note 1 to entry has been replaced by a new one.]

3.29

removal efficiency

E

fraction or percentage of a challenge contaminant (3.10) that is retained by a GPAC medium or device at a given time

Note 1 to entry: Removal efficiency is also known simply as “efficiency”.

[SOURCE:ISO 29464:2017, 3.5.26, modified — The symbol E has been added.]

3.30

residence time

relative time that an increment of fluid [or contaminant (3.10) ] is within the boundaries of the medium volume

[SOURCE:ISO 29464:2017, 3.5.52, modified — Notes to entry have been removed.]

3.31

retentivity

m_r

measure of the ability of an adsorbent (3.3) or GPACD (3.15) to resist desorption (3.11) of an adsorbate (3.2)

Note 1 to entry: Computed as the residual capacity (fraction remaining) after purging the adsorbent with clean, conditioned air only, following challenge breakthrough.

[SOURCE:ISO 29464:2017, 3.5.53, modified — The symbol m_r has been added.]

3.32

very light duty

vLD

removal efficiency (3.29) versus dose performance for a GPACD (3.15) that reaches less than 50 % efficiency at the LD (3.21) dose