Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p18
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 18/56)
Character Range: 344434–348679

trace of the exhaust gas mass flow rate shall be time aligned by the transformation time as defined in paragraph 3.1. Therefore, the response time of the exhaust gas mass flow system and each gaseous emissions analyzer shall be determined according to paragraphs 8.4.1.2. and 9.3.5., respectively, and recorded.
8.4.2.3. Calculation of mass emission based on tabulated values
 The mass of the pollutants (g/test) shall be determined by calculating the instantaneous mass emissions from the raw concentrations of the pollutants and the exhaust gas mass flow, aligned for the transformation time as determined in accordance with paragraph 8.4.2.2., integrating the instantaneous values over the cycle, and multiplying the integrated values with the u values from Table 5. If measured on a dry basis, the dry/wet correction according to paragraph 8.1. shall be applied to the instantaneous concentration values before any further calculation is done.
 For the calculation of NOx, the mass emission shall be multiplied, where applicable, with the humidity correction factor kh,D, or kh,G, as determined according to paragraph 8.2.
 The following equation shall be applied:
                (36)

Where:
                  ugas  is the respective value of the exhaust component from Table 5
                  cgas,i is the instantaneous concentration of the component in the exhaust gas, ppm
                  qmew,i is the instantaneous exhaust mass flow, kg/s
                  f is the data sampling rate, Hz
                  n is the number of measurements
    Table 5
    Raw exhaust gas u values and component densities
Fuel                                                                                            e                              Gas
NOx                                                                                             CO      HC            CO2       O2         CH4
                                                                                                        gas [kg/m3]
2.053                                                                                           1.250   a             1.9636    1.4277     0.716
                                                                                                        ugasb
Diesel (B7)                                                                                     1.2943  0.001586      0.000966  0.000482   0.001517  0.001103  0.000553
Ethanol                                                                                         1.2768  0.001609      0.000980  0.000780   0.001539  0.001119  0.000561
(ED95)
CNGc                                                                                            1.2661  0.001621      0.000987  0.000528d  0.001551  0.001128  0.000565
Propane                                                                                         1.2805  0.001603      0.000976  0.000512   0.001533  0.001115  0.000559
Butane                                                                                          1.2832  0.001600      0.000974  0.000505   0.001530  0.001113  0.000558
LPGe                                                                                            1.2811  0.001602      0.000976  0.000510   0.001533  0.001115  0.000559
Petrol (E10)                                                                                    1.2931  0.001587      0.000966  0.000499   0.001518  0.001104  0.000553
Ethanol                                                                                         1.2797  0.001604      0.000977  0.000730   0.001534  0.001116  0.000559
(E85)
a depending on fuel
b at  = 2, dry air, 273 K, 101.3 kPa
c u accurate within 0.2 % for mass composition of: C = 66 - 76 %; H = 22 - 25 %; N = 0 - 12 %
d NMHC on the basis of CH2.93 (for total HC the ugas coefficient of CH4 shall be used)
e u accurate within 0.2 % for mass composition of: C3 = 70 - 90 %; C4 = 10 - 30 %

8.4.2.4. Calculation of mass emission based on exact equations
 The mass of the pollutants (g/test) shall be determined by calculating the instantaneous mass emissions from the raw concentrations of the pollutants, the u values and the exhaust gas mass flow, aligned for the transformation time as