Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p23
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 23/30)
Character Range: 583608–586810

the dilution air, ppm

              D = dilution factor

              The dilution factor shall be calculated as follows:

              (a) for diesel and LPG fueled gas engines

              (b) for NG fueled gas engines

              where:

              cCO2 = concentration of CO2 in the diluted exhaust gas, % vol

              cHC = concentration of HC in the diluted exhaust gas, ppm C1

              cNMHC = concentration of NMHC in the diluted exhaust gas, ppmC1

              cCO = concentration of CO in the diluted exhaust gas, ppm

              FS = stoichiometric factor

              Concentrations measured on dry basis shall be converted to a wet basis in accordance with section 5.2 of Appendix 1 to this Annex.

              The stoichiometric factor shall be calculated as follows:

              where:

              α, ε are the molar ratios referring to a fuel CHαOε

              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

        5.5.  Calculation of the specific emissions

         The emissions (g/kWh) shall be calculated in the following way:

         (a) all components, except NOx:

         (b) NOx:

         where:

         Wact = actual cycle work as determined according to section 3.9.2.

        5.5.1. In case of a periodic exhaust aftertreatment system, the emissions shall be weighted as follows:

         where:

         n1 = number of ETC tests between two regenerations
         n2 = number of ETC during a regeneration (minimum of one ETC test)
         Mgas,n2 = emissions during a regeneration
         Mgas,n1 = emissions after a regeneration.

        6.   CALCULATION OF THE PARTICULATE EMISSION (IF APPLICABLE)

        6.1.  Data evaluation

              The particulate filter shall be returned to the weighing chamber no later than one hour after completion of the test. It shall be con- ditioned in a partially covered petri dish, which is protected against dust contamination, for at least one hour, but not more than 80 hours, and then weighed. The gross weight of the filters shall be recorded and the tare weight subtracted, which results in the particulate sample mass mf. For the evaluation of the particulate concentration, the total sample mass (msep) through the filters over the test cycle shall be recorded.

              If background correction is to be applied, the dilution air mass (md) through the filter and the particulate mass (mf,d) shall be recorded.

        6.2.  Calculation of the mass flow

        6.2.1. Full flow dilution system

              The particulate mass (g/test) shall be calculated as follows:

             where:

            mf = particulate mass sampled over the cycle, mg

           msep = mass of diluted exhaust gas passing the particulate collection filters, kg

          med = mass of diluted exhaust gas over the cycle, kg

              If a double dilution system is used, the mass of the secondary dilution air shall be subtracted from the total mass of the double diluted exhaust gas sampled through the