Division 2.2.2.1: Diluted exhaust gas - Commission Delegated Regulation (EU) 2017/654 of 19 December 2016 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery

Dry concentrations shall be converted to wet concentrations by means of one of the following two equations [(7-25) or (7-26)] applied to equation:

k_{w,e} = [(1 - \frac{α \times c_{CO2w}}{200}) - k_{w2}] \times 1,008

(7-25)

or

k_{w,e} = (\frac{(1 - k_{w2})}{1 + \frac{α \times c_{CO2d}}{200}}) \times 1,008

(7-26)

where:

α

molar hydrogen to carbon ratio of the fuel [-]

c _CO2w

concentration of CO₂ in the diluted exhaust gas on a wet basis [per cent vol]

c _CO2d

concentration of CO₂ in the diluted exhaust gas on a dry basis [per cent vol]

The dry to wet correction factor k _w2 takes into consideration the water content of both intake air and dilution air and shall be calculated by means of equation (7-27):

k_{w2} = \frac{1,608 \times [H_{d} \times (1 - \frac{1}{D}) + H_{a} \times (\frac{1}{D})]}{1000 + \{1,608 \times [H_{d} (1 - \frac{1}{D}) + H_{a} \times (\frac{1}{D})]\}}

(7-27)

where:

H _a

intake air humidity [g H₂O/kg dry air]

H _d

dilution air humidity [g H₂O/kg dry air]

D

dilution factor [see equation (7-28) of point 2.2.2.2] [-]

Division 2.2.2.1 Diluted exhaust gas