Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p2
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 2/3)
Character Range: 538303–541287

dilution tunnel, per cent
                  cCO2,a is the wet CO2 concentration in the ambient air, per cent
                  qmew is the exhaust gas mass flow rate on wet basis, kg/s
                  qmp is the sample flow of exhaust gas into partial flow dilution system, kg/s
                  Me is the molar mass of exhaust gas, g/mol
 If CO2 is measured on a dry basis, it shall be converted to wet basis according to paragraph 8.1. of this annex.
       A.4.5.  Calculation of the molar mass of the exhaust gas
 The molar mass of the exhaust gas shall be calculated according to equation 41 (see paragraph 8.4.2.4. of this annex).
 Alternatively, the following exhaust gas molar masses may be used:
 Me (diesel) = 28.9 g/mol
 Me (LPG) = 28.6 g/mol
 Me (NG) = 28.3 g/mol

Annex 4 ‑ Appendix 5 Example of calculation procedure
       A.5.1.  Speed and torque denormalization procedure
As an example, the following test point shall be denormalized:
per cent speed = 43 per cent
per cent torque = 82 per cent
         Given the following values:
 nlo = 1,015 min-1
 nhi = 2,200 min-1
 npref = 1,300 min-1
 nidle =    600 min-1
 results in:
 With the maximum torque of 700 Nm observed from the mapping curve at 1,178 min-1
A.5.2. Basic data for stoichiometric calculations
               Atomic mass of hydrogen 1.00794 g/atom

               Atomic mass of carbon 12.011 g/atom

               Atomic mass of sulphur 32.065 g/atom

               Atomic mass of nitrogen 14.0067 g/atom

               Atomic mass of oxygen 15.9994 g/atom

               Atomic mass of argon 39.9 g/atom

               Molar mass of water 18.01534 g/mol

               Molar mass of carbon dioxide 44.01 g/mol

               Molar mass of carbon monoxide 28.011 g/mol

               Molar mass of oxygen 31.9988 g/mol

               Molar mass of nitrogen 28.011 g/mol

               Molar mass of nitric oxide 30.008 g/mol

               Molar mass of nitrogen dioxide 46.01 g/mol

               Molar mass of sulphur dioxide 64.066 g/mol

               Molar mass of dry air 28.965 g/mol

 Assuming no compressibility effects, all gases involved in the engine intake/combustion/exhaust process can be considered to be ideal and any volumetric calculations shall therefore be based on a molar volume
of 22.414 l/mol according to Avogadro's hypothesis.
A.5.3. Gaseous emissions (diesel fuel)
 The measurement data of an individual point of the test cycle (data sampling rate of 1 Hz) for the calculation of the instantaneous mass emission are shown below. In this example, CO and NOx are measured on a dry basis, HC on a wet basis. The HC concentration is given in propane equivalent (C3) and has to be multiplied by 3 to result in the C1 equivalent. The calculation procedure is identical for the other points of the cycle.
 The calculation example shows the rounded intermediate results of the different steps for better illustration. It should be noted that for actual calculation,