Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p23
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 23/56)
Character Range: 359083–363310

8.5.2.3.
8.5.2.2. Data evaluation
 The emission relevant data shall be recorded and stored in accordance with paragraph 7.6.6.
8.5.2.3. Calculation of mass emission
8.5.2.3.1. Systems with constant mass flow
 For systems with heat exchanger, the mass of the pollutants shall be determined from the following equation:
mgas  =  ugas x cgas x med (in g/test) (56)
 Where:
                  ugas  is the respective value of the exhaust component from Table 6
                  cgas is the average background corrected concentration of the component, ppm
                  med is the total diluted exhaust mass over the cycle, kg
 If measured on a dry basis, the dry/wet correction according to paragraph 8.1. shall be applied.
 For the calculation of NOx, the mass emission shall be multiplied, if applicable, with the humidity correction factor kh,D, or kh,G, as determined according to paragraph 8.2.
 The u values are given in Table 6. For calculating the ugas values, the density of the diluted exhaust gas has been assumed to be equal to air density. Therefore, the ugas values are identical for single gas components, but different for HC.
    Table 6
    Diluted exhaust gas u values and component densities
Fuel                                                                                            de                             Gas
NOx                                                                                             CO     HC             CO2       O2         CH4
                                                                                                       gas  [kg/m3]
2.053                                                                                           1.250  a              1.9636    1.4277     0.716
                                                                                                       ugasb
Diesel (B7)                                                                                     1.293  0.001588       0.000967  0.000483   0.001519  0.001104  0.000553
Ethanol                                                                                         1.293  0.001588       0.000967  0.000770   0.001519  0.001104  0.000553
(ED95)
CNGc                                                                                            1.293  0.001588       0.000967  0.000517d  0.001519  0.001104  0.000553
Propane                                                                                         1.293  0.001588       0.000967  0.000507   0.001519  0.001104  0.000553
Butane                                                                                          1.293  0.001588       0.000967  0.000501   0.001519  0.001104  0.000553
LPGe                                                                                            1.293  0.001588       0.000967  0.000505   0.001519  0.001104  0.000553
Petrol (E10)                                                                                    1.293  0.001588       0.000967  0.000499   0.001519  0.001104  0.000554
Ethanol                                                                                         1.293  0.001588       0.000967  0.000722   0.001519  0.001104  0.000554
(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 %

 Alternatively, the u values may be calculated using the exact calculation method generally described in paragraph 8.4.2.4., as follows:

                      (57)
 Where:
                  Mgas is the molar mass of the gas component, g/mol (see Appendix 5 to this annex)
                  Me is the molar mass of the exhaust gas, g/mol
                  Md is the molar mass of the diluent = 28.965 g/mol
                  D is the dilution factor (see paragraph 8.5.2.3.2.)
8.5.2.3.2. Determination of the background corrected concentrations
 The average background concentration of the gaseous pollutants in the diluent shall be subtracted from the measured concentrations to get the