# 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, Division 2.1.6.4: Carbon balance method, 1-step procedure

Extent: E+W+S+N.I.

The following 1-step formula set out in equation (7-20) can be used for the calculation of the wet exhaust gas mass flow rate qm ew, i [kg/s]:
q m ew, i = q m f, i × 1,4 × w 2 C 1,0828 × w C + k fd × f c f c 1 + H a 1000 + 1
(7-20)
with the carbon factor f c [-] given by:
f c = 0,5441 × c CO2d − c CO2d,a + c COd 18522 + c HCw 17355
(7-21)
Where:
qm f, i instantaneous fuel mass flow rate [kg/s]
w C carbon content of fuel [% mass] (see equation (7-82) of point 3.3.3.1 or table 7.3)
H a intake air humidity [g H2O/kg dry air]
k fd combustion additional volume on a dry basis [m3/kg fuel]
c CO2d dry CO2 concentration in the raw exhaust gas [%]
c CO2d,a dry CO2 concentration in the ambient air [%]
c COd dry CO concentration in the raw exhaust gas [ppm]
c HCw wet HC concentration in the raw exhaust gas [ppm]
and factor k fd [m3/kg fuel] that is calculated by means of equation (7-22) on a dry basis by subtracting the water formed by combustion from k f:
k fd = k f – 0,11118 · w H
(7-22)
where:
k f fuel specific factor of equation (7-5) [m3/kg fuel]
w H hydrogen content of fuel [% mass]

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Source: https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/2/division/2.1/division/2.1.6/division/2.1.6.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.1/division-2.1.6/division-2.1.6.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.