Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p9
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 9/30)
Character Range: 544939–548459

humidity of the intake air, g water per kg dry air

              where:

              Ha may be derived from relative humidity measurement, dewpoint measurement, vapour pressure measurement or dry/wet bulb measurement using the generally accepted formulae.

              (b) for spark ignition engines

              where:

              Ha may be derived from relative humidity measurement, dew point measurement, vapour pressure measurement or dry/wet bulb measurement using the generally accepted formulae.

        5.4.  Calculation of the emission mass flow rates

              The emission mass flow rate (g/h) for each mode shall be calculated as follows. For the calculation of NOx, the humidity correction factor kh,D, or kh,G, as applicable, as determined according to section 5.3, shall be used.

              The measured concentration shall be converted to a wet basis according to section 5.2 if not already measured on a wet basis. Val- ues for ugas are given in Table 6 for selected components based on ideal gas properties and the fuels relevant for this Directive.

              (a) for the raw exhaust gas

              where:

              ugas = ratio between density of exhaust component and density of exhaust gas

              cgas = concentration of the respective component in the raw exhaust gas, ppm

              qmew = exhaust mass flow rate, kg/h

              (b) for the diluted gas

              mgas  = ugas  × cgas,c  × qmdew

              where:

              ugas = ratio between density of exhaust component and density of air

                  cgas = background corrected concentration of the respective component in the diluted exhaust gas, ppm

              qmew = diluted exhaust mass flow rate, kg/h

              where:

              The dilution factor D shall be calculated according to section 5.4.1 of Appendix 2 to this Annex.

        5.3.  Calculation of the specific emissions

              The emissions (g/kWh) shall be calculated for all individual components in the following way:

              where:

              mgas is the mass of individual gas

              Pn is the net power determined according to section 8.2 in Annex II.

              The weighting factors used in the above calculation are according to section 2.7.1.

Table 6

Values of ugas in the raw and dilute exhaust gas for various exhaust components

Fuel                         NOx       CO        THC/NMHC  CO2       CH4
                Exhaust raw  0,001587  0,000966  0,000479  0,001518  0,000553
Diesel
Exhaust dilute  0,001588     0,000967  0,000480  0,001519  0,000553
                Exhaust raw  0,001609  0,000980  0,000805  0,001539  0,000561
Ethanol
Exhaust dilute  0,001588     0,000967  0,000795  0,001519  0,000553
                Exhaust raw  0,001622  0,000987  0,000523  0,001552  0,000565
CNG
Exhaust dilute  0,001588     0,000967  0,000584  0,001519  0,000553
                Exhaust raw  0,001603  0,000976  0,000511  0,001533  0,000559
Propane
Exhaust dilute  0,001588     0,000967  0,000507  0,001519  0,000553
                Exhaust raw  0,001600  0,000974  0,000505  0,001530  0,000558
Butane
Exhaust dilute  0,001588     0,000967  0,000501  0,001519  0,000553

      Notes:
            —       u values of raw exhaust based on ideal gas properties at λ = 2, dry air, 273 K, 101,3 kPa
            —       u values of dilute exhaust based on ideal gas properties and density of air
            —       u