{
  "url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.1/division-2.1.6/division-2.1.6.4",
  "json_url": "https://openlegislation.uk/eu-regulation-2017-654/annex-VII/division-2/division-2.1/division-2.1.6/division-2.1.6.4.json",
  "legislation": "eur/2017/654",
  "legislation_title": "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",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2017-654",
  "path": "annex/VII/division/2/division/2.1/division/2.1.6/division/2.1.6.4",
  "kind": "division",
  "number": "2.1.6.4",
  "heading": "Carbon balance method, 1-step procedure",
  "text": "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]:\nq 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\n(7-20)\nwith the carbon factor f c [-] given by:\nf c = 0,5441 × c CO2d − c CO2d,a + c COd 18522 + c HCw 17355\n(7-21)\nWhere:\nqm f, i instantaneous fuel mass flow rate [kg/s]\nw C carbon content of fuel [% mass] (see equation (7-82) of point 3.3.3.1 or table 7.3)\nH a intake air humidity [g H2O/kg dry air]\nk fd combustion additional volume on a dry basis [m3/kg fuel]\nc CO2d dry CO2 concentration in the raw exhaust gas [%]\nc CO2d,a dry CO2 concentration in the ambient air [%]\nc COd dry CO concentration in the raw exhaust gas [ppm]\nc HCw wet HC concentration in the raw exhaust gas [ppm]\nand 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:\nk fd = k f – 0,11118 · w H\n(7-22)\nwhere:\nk f fuel specific factor of equation (7-5) [m3/kg fuel]\nw H hydrogen content of fuel [% mass]",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Delegated Regulation (EU) 2018/989 of 18 May 2018 amending and correcting Delegated Regulation (EU) 2017/654 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 (Text with EEA relevance)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2017/654/annex/VII/division/2/division/2.1/division/2.1.6/division/2.1.6.4",
    "retrieved_at": "2026-11-01T14:45:01.864924+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}