Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:10:p22
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 10 (pt 22/30)
Character Range: 580646–583923

as follows depending on the measurement method applied. The mea- sured concentration shall be converted to a wet basis according to section 5.2 of Appendix 1 to this Annex, if not already measured on a wet basis. The respective values for ugas shall be applied that are given in Table 6 of Appendix 1 to this Annex for selected components based on ideal gas properties and the fuels relevant for this Directive.

              (a) for the raw exhaust gas:

              where:

         ugas = ratio between density of exhaust component and density of exhaust gas from table 6

         cgas,i = instantaneous concentration of the respective component in the raw exhaust gas, ppm

         qmew,i = instantaneous exhaust mass flow rate, kg/s

         ƒ = data sampling rate, Hz

         n = number of measurements

              (b) for the diluted exhaust gas without flow compensation:

              where:

              ugas = ratio between density of exhaust component and density of air from table 6

              cgas = average background corrected concentration of the respective component, ppm

              med = total diluted exhaust mass over the cycle, kg

              (c) for the diluted exhaust gas with flow compensation:

              where:

                  ce,i = instantaneous concentration of the respective component measured in the diluted exhaust gas, ppm

              cd = concentration of the respective component measured in the dilution air, ppm

              qmdew,I = instantaneous diluted exhaust gas mass flow rate, kg/s

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

              ugas = ratio between density of exhaust component and density of air from table 6

              D = dilution factor (see section 5.4.1)

              If applicable, the concentration of NMHC and CH4 shall be calculated by either of the methods shown in section 3.3.4 of Appen- dix 4 to this Annex, as follows:

              (a) GC method (full flow dilution system, only):

              (b) NMC method:

              where:

              cHC(w/Cutter) = HC concentration with the sample gas flowing through the NMC

              cHC(w/oCutter) = HC concentration with the sample gas bypassing the NMC

        5.4.1. Determination of the background corrected concentrations (full flow dilution system, only)

              The average background concentration of the gaseous pollutants in the dilution air shall be subtracted from measured concentra- tions 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 formula shall be used.

              where:

              ce = concentration of the respective pollutant measured in the diluted exhaust gas, ppm

              cd = concentration of the respective pollutant measured in 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