Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:110:p10
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 110 (pt 10/59)
Character Range: 628953–632302

the ambient air, % (around 0,04 %)
              qmew = exhaust gas mass flow rate on wet basis, kg/s
              Mre = molecular mass of exhaust gas

              If CO2 is measured on a dry basis it shall be converted to a wet basis according to section 5.2 of Appendix 1 to this Annex.

        2.3.  Carbon flow rate in the dilution system (location 3)

              The carbon flow rate shall be determined from the dilute CO2 concentration, the exhaust gas mass flow rate and the sample flow rate:
              where:

              cCO2,d = wet CO2 concentration in the dilute exhaust gas at the outlet of the dilution tunnel, %
              cCO2,a = wet CO2 concentration in the ambient air, % (around 0,04 %)
              qmdew = diluted exhaust gas mass flow rate on wet basis, kg/s
              qmew = exhaust gas mass flow rate on wet basis, kg/s (partial flow system only)
         qmp = sample flow of exhaust gas into partial flow dilution system, kg/s (partial flow system only)
              Mre = molecular mass of exhaust gas

              If CO2 is measured on a dry basis, it shall be converted to wet basis according to section 5.2 of Appendix 1 to this Annex.

        2.4.  The molecular mass (Mre) of the exhaust gas shall be calculated as follows:

where:
qmf         =  fuel mass flow rate, kg/s
qmaw        =  intake air mass flow rate on wet basis, kg/s
Ha          =  humidity of intake air, g water per kg dry air
Mra         =  molecular mass of dry intake air (= 28,9 g/mol)
α, δ, ε, γ  =  molar ratios referring to a fuel CHαOδNεSγ

              Alternatively, the following molecular masses may be used:

Mre (diesel)  =  28,9 g/mol
Mre (LPG)     =  28,6 g/mol
Mre (NG)      =  28,3 g/mol'

(4) Annex IV is amended as follows:

    (a)       The title of section 1.1 is replaced by the following:

             '1.1. Diesel reference fuel for testing engines to the emission limits given in row a of the Tables in Section 6.2.1 of Annex I (1)'

    (b)     The following section 1.2 is inserted:

             '1.2.  Diesel reference fuel for testing engines to the emission limits given in rows B1, B2 or C of the Tables in Section 6.2.1 of Annex I

                                                          Limits (1)
Parameter                                     Unit                    Test Method
minimum                                       maximum
Cetane number (2)                                         52,0        54,0         EN-ISO 5165
Density at 15 °C                              kg/m3       833         837          EN-ISO 3675
Distillation:
— 50 % point                                  °C          245         —            EN-ISO 3405
— 95 % point                                  °C          345         350          EN-ISO 3405
— Final boiling point                         °C          —           370          EN-ISO 3405
Flash point                                   °C          55          —            EN 22719
CFPP                                          °C          —           –5           EN 116
Viscosity at 40 °C                            mm2/s       2,3         3,3          EN-ISO 3104
Polycyclic aromatic hydrocarbons              % m/m       2,0         6,0          IP 391
Sulphur content (3)                           mg/kg       —           10           ASTM