Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p24
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 24/56)
Character Range: 363007–366391

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 net concentrations of the pollutants. The average values of the background concentrations can be determined by the sample bag method or by continuous measurement with integration. The following equation shall be used:
cgas  =  cgas,e - cd x (1 - (1/D)) (58)

 Where:
                  cgas,e is the concentration of the component measured in the diluted exhaust gas, ppm
                  cd is the concentration of the component measured in the diluent, ppm
                  D is the dilution factor
 The dilution factor shall be calculated as follows:
                  a) For diesel fuelled engines and LPG fuelled gas engines
                   (59)
                  b) For natural gas fuelled gas engines
                   (60)
   Where:
                       cCO2,e is the wet concentration of CO2 in the diluted exhaust gas, per cent vol

                       cHC,e is the wet concentration of HC in the diluted exhaust gas, ppm C1

                       cNMHC,e is the wet concentration of NMHC in the diluted exhaust gas, ppm C1

                       cCO,e is the wet concentration of CO in the diluted exhaust gas, ppm

                       FS is the stoichiometric factor

   The stoichiometric factor shall be calculated as follows:
                          (61)
   Where:
                        is the molar hydrogen ratio of the fuel (H/C)

                   Alternatively, if the fuel composition is not known, the following stoichiometric factors may be used:
                  FS (diesel) = 13.4
                  FS (LPG) = 11.6
                  FS (NG) =   9.5
                  FS (E10) = 13.3
                  FS (E85) = 11.5
8.5.2.3.3. Systems with flow compensation
 For systems without heat exchanger, the mass of the pollutants (g/test) shall be determined by calculating the instantaneous mass emissions and integrating the instantaneous values over the cycle. Also, the background correction shall be applied directly to the instantaneous concentration value. The following equation shall be applied:
                     (62)
 Where:
                  cgas,e is the concentration of the component measured in the diluted exhaust gas, ppm
                  cd is the concentration of the component measured in the diluent, ppm
                  med,i is the instantaneous mass of the diluted exhaust gas, kg
                  med is the total mass of diluted exhaust gas over the cycle, kg
                  ugas is the tabulated value from Table 6
                  D is the dilution factor
8.5.3. Particulate determination
8.5.3.1. Calculation of mass emission
 The particulate mass (g/test) shall be calculated after buoyancy correction of the particulate sample filter according to paragraph 8.3., as follows:
 (63)
 Where:
                  mp is the particulate mass sampled over the cycle, mg
                  msep  is the mass of diluted exhaust gas passing the particulate collection filters, kg
                  med is the mass of diluted exhaust gas over the cycle, kg
                  With
msep = mset - mssd (64)
 Where: