Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:13:p13
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 13 (pt 13/56)
Character Range: 330887–333860

the fuel:

              CH1.86O0.006 for diesel (B7),
              CH2.92O0.46 for ethanol for dedicated C.I. engines (ED95),
              CH1.93O0.032  for petrol (E10),
              CH2.74O0.385 for ethanol (E85),
              CH2.525 for LPG (liquefied petroleum gas),

CH4 for NG (natural gas) and biomethane.

 Examples of the calculation procedures are given in Appendix 5 to this annex.

 Emissions calculation on a molar basis, in accordance with Annex 7 of gtr No. 11 concerning the exhaust emission test protocol for Non-Road Mobile Machinery (NRMM), is permitted with the prior agreement of the Type Approval Authority.

8.1. Dry/wet correction

 If the emissions are measured on a dry basis, the measured concentration shall be converted to a wet basis according to the following equation:
               (12)

 Where:

 cd is the dry concentration in ppm or per cent volume

                   kw is the dry/wet correction factor (kw,a, kw,e, or kw,d depending on respective equation used)

8.1.1. Raw exhaust gas

                       (13)
 or
                      (14)
 or
                      (15)
 With
                      (16)
              and
               (17)

 Where:

 Ha is the intake air humidity, g water per kg dry air

 wALF is the hydrogen content of the fuel, per cent mass

 qmf,i is the instantaneous fuel mass flow rate, kg/s

 qmad,I is the instantaneous dry intake air mass flow rate, kg/s

 pr is the water vapour pressure after cooling bath, kPa

 pb is the total atmospheric pressure, kPa

 wDEL is the nitrogen content of the fuel, per cent mass

 wEPS is the oxygen content of the fuel, per cent mass

  is the molar hydrogen ratio of the fuel

 cCO2 is the dry CO2 concentration, per cent

 cCO is the dry CO concentration, per cent
Equations 13 and 14 are principally identical with the factor 1.008 in equations 13 and 15 being an approximation for the more accurate denominator in equation 14.
8.1.2. Diluted exhaust gas
  (18)
 or
  (19)
 With
  (20)
 Where:

  is the molar hydrogen ratio of the fuel

 cCO2w is the wet CO2 concentration, per cent

 cCO2d is the dry CO2 concentration, per cent

 Hd is the diluent humidity, g water per kg dry air

 Ha is the intake air humidity, g water per kg dry air

 D is the dilution factor (see paragraph 8.5.2.3.2.)

8.1.3. Diluent
  (21)
 With
 (22)

 Where:

 Hd is the diluent humidity, g water per kg dry air

8.2. NOx correction for humidity

 As the NOx emission depends on ambient air conditions, the NOx concentration shall be corrected for humidity with the factors given in paragraph 8.2.1. or 8.2.2. The intake air humidity Ha may be derived from relative humidity measurement, dew point measurement, vapour pressure measurement or dry/wet bulb measurement using generally accepted equations.
       8.2.1. Compression-ignition engines
               (23)
 Where:

 Ha is the intake air humidity, g water per kg dry air
8.2.2. Positive ignition engines
  (24)