Document ID: chunk:federal_register_of_legislation:F2023C00229:reg:5:p5
Version: federal_register_of_legislation:F2023C00229
Segment Type: reg
Provision Reference: reg 5 (pt 5/36)
Character Range: 431486–434656

n and m = refer to average CnHm representing the fuel hydrocarbons, i.e:

              where:

              CH4 = % by volume of methane in the fuel;

              C2 =% by volume of all C2 hydrocarbons (e.g. C2H6, C2H4, etc.) in the fuel;

              C3 =% by volume of all C3 hydrocarbons (e.g. C3H8, C3H6, etc.) in the fuel;

              C4 =% by volume of all C4 hydrocarbons (e.g. C4H10, C4H8, etc.) in the fuel;

              C5 =% by volume of all C5 hydrocarbons (e.g. C5H12, C5H10, etc.) in the fuel;

              diluent =% by volume of dilution gases in the fuel (i.e. O2, N2, CO2, He etc.).

4.2.                            Examples for the calculation of the λ-shift factor Sλ

              Example 1: G25: CH4 = 86 %, N2 = 14 % (by volume)

              Example 2: GR: CH4 =87%,C2H6 =13%(by vol)

              Example 3: USA: CH4 =89%, C2H6 = 4,5%, C3H8 =2,3%, C6H14 =0,2%, O2 =0,6%, N2 =4%

ANNEX VIII

       SPECIFIC TECHNICAL REQUIREMENTS RELATING TO ETHANOL-FUELLED DIESEL ENGINES

       In the case of ethanol-fuelled diesel engines, the following specific modifications to the appropriate paragraphs, equations   and factors will apply to the test procedures defined in Annex III to this Directive.

       IN ANNEX III, APPENDIX 1:

              4.2.                           Dry/wet correction

              4.3.                           NOx correction for humidity and temperature

              with,

              A = 0,181 GFUEL/GAIRD - 0,0266

              B = – 0,123 GFUEL/GAIRD + 0,00954

              Ta = temperature of the air, K

              Ha = humidity of the intake air, g water per kg dry air

              4.4.                           Calculation of the emission mass flow rates

              The emission mass flow rates (g/h) for each mode shall be calculated as follows, assuming the exhaust gas density to be 1,272 kg/m3 at 273 K (0 °C) and 101,3 kPa:

                (1)      NOx mass = 0,001613 × NOx conc × KH,D × GEXH W

                (2)      COx mass = 0,000982 × COconc × GEXH W

                (3)      HCmass = 0,000809 × HCconc × KH,D × GEXH W

              where

              NOx conc, COconc, HCconc (1) are the average concentrations (ppm) in the raw exhaust gas, as determined in Section 4.1.

              If, optionally, the gaseous emissions are determined with a full flow dilution system, the following formulae shall be applied:

                (1)      NOx mass = 0,001587 × NOx conc × KH,D × GTOT W

                (2)      COx mass = 0,000966 × COconc × GTOT W

                (3)      HCmass = 0,000795 × HCconc × GTOT W

              where

              NOx conc, COconc, HCconc (1) are the average background corrected concentrations (ppm) of each mode in the diluted exhaust gas, as determined in Annex III, Appendix 2, Section 4.3.1.1.

           (1)       Based on C1 equivalent.

       IN ANNEX III, APPENDIX 2:

       Sections 3.1, 3.4, 3.8.3 and 5 of Appendix 2 do not apply solely to diesel engines. They also apply to ethanol-fuelled       diesel engines.

              4.2.                           The conditions for the test