ISO 29042-1:2008 機械の安全性—空気中の有害物質の排出の評価—パート1：試験方法の選択 | ページ 6

3.1

uncontrolled emission rate of a given pollutant

ṁ_u

mass of pollutant emitted from the machine into the space around the machine per unit of time

Note 1 to entry: Any measures to reduce the air pollution around the machine (e.g. capture devices, containment equipment, wetting process) should not be used or should be de-activated.

3.2

controlled emission rate of a given pollutant

ṁ_k

mass of pollutant emitted from the machine into the space around the machine per unit of time, taking into account the effects of measures to reduce the air pollution

Note 1 to entry: Any measures to reduce the air pollution around the machine (e.g. capture devices, containment equipment, wetting process) should be used or activated.

3.3

capture efficiency

η_c

ratio of the mass flow rate of a given pollutant directly collected by the pollutant control system to the uncontrolled mass flow rate of this pollutant emitted from the machine

Note 1 to entry: The capture efficiency, as a percentage, can be calculated by the following equation:

(1)

This equation is applicable only if ṁ_u − ṁ_k represents the pollutant mass flow rate directly captured. This parameter is not usable when the amount of emission is affected by the control system.

Note 2 to entry: Where the pollutant control system is an exhaust system and provided comparable discharge and flow patterns of the real pollutant can be simulated by a tracer technique the equation becomes:

(2)

where

qC	is the flow rate of tracer collected by the exhaust system during operation;
qE	is the flow rate of tracer emitted (measured by emitting the tracer directly into the exhaust system during the first phase).

Note 3 to entry: For further details see ISO 29042-4:—, Clause 5.

3.4

separation efficiency by mass

η_s

ratio of the mass of pollutant retained by the air cleaning system ( m₃) to the mass of pollutant entering the air cleaning system ( m₁) during a given period

Note 1 to entry: For special applications the number of fibres or particles is measured instead of the mass.

Note 2 to entry: The separation efficiency of an air cleaning system, as a percent mass fraction, can be calculated by the following equation:

(3)

Note 3 to entry: In certain cases it can be necessary to consider only that part of pollutants (e.g. size of particles) which is actually hazardous for exposed persons; e.g. separation efficiency of a separation system against hazardous dust is measured as a function of particle size — otherwise the results will possibly not be reliable for health and safety purposes.

3.5

pollutant concentration parameter

P_c

the measured concentration of a given pollutant in defined position(s) near the machine

3.6

decontamination index

I_A

the average of the ratio, obtained at a number of specified locations in the surroundings, of the ambient air quality improvement to the real pollutant mean concentration with the pollutant control system not in operation

Note 1 to entry: Corrections can be necessary to take into account air pollution caused by other operations (“the background level”).

Note 2 to entry: The decontamination index can be calculated by the following equation:

(4)

where

Ca i	is the real pollutant concentration measured at a specified location in the surrounding under the following condition: machine in operation, pollutant control system not in operation;
Cm i	is the real pollutant concentration measured at a specified location in the surrounding under the following condition: machine and pollutant control system in operation;
Cf i	is the real pollutant concentration measured at a specified location in the surrounding under the following condition: machine and pollutant control system not in operation (“the background level”);
n	is the number of specified locations.

Note 3 to entry: When the “background level” is negligible, the decontamination index reduces to:

(5)