Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:10:p5
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 10 (pt 5/32)
Character Range: 1282435–1285838

equation:
              where:
                      is the HC concentration with C2H6 flowing through the NMC, ppm C;
                      is the HC concentration with C2H6 bypassing the NMC, ppm C.
              If the ethane conversion efficiency of the NMC is 0.98 or above, EE shall be set to 1 for any subsequent calculation.
              3.2.1.1.3.4. If the methane FID is calibrated through the cutter, EM shall be 0.
              The equation to calculate CCH4 in paragraph 3.2.1.1.3.2. (case (b)) in this annex becomes:
              The equation to calculate CNMHC in paragraph 3.2.1.1.3.2. (case (b)) in this annex becomes:
              The density used for NMHC mass calculations shall be equal to that of total hydrocarbons at 273.15 K (0 °C) and 101.325 kPa and is fuel-dependent.
              3.2.1.1.4. Flow-weighted arithmetic average concentration calculation
              The following calculation method shall be applied for CVS systems that are not equipped with a heat exchanger or for CVS systems with a heat exchanger that does not comply with paragraph 3.3.5.1. of Annex B5.
              This flow weighted arithmetic average concentration calculation shall be used for all continuous diluted measurements including PN. It may be optionally applied for CVS systems with a heat exchanger that complies with paragraph 3.3.5.1 of Annex B5.
              where:
               is the flow-weighted arithmetic average concentration;
               is the CVS flow rate at time , m³/sec;
               is the concentration at time , ppm;
               sampling interval, s;
               total CVS volume, m³;
                      is the test time, s.
              3.2.1.2. Calculation of the NOx humidity correction factor
              In order to correct the influence of humidity on the results of oxides of nitrogen, the following calculations apply:
           where:
              and:
                   is the specific humidity, grams of water vapour per kilogram dry air;
                   is the relative humidity of the ambient air, per cent;
                   is the saturation vapour pressure at ambient temperature, kPa;
                   is the atmospheric pressure in the room, kPa.
              The KH factor shall be calculated for each phase of the test cycle.
              The ambient temperature and relative humidity shall be defined as the arithmetic average of the continuously measured values during each phase.
              3.2.2. Determination of the HC mass emissions from compression-ignition engines
              3.2.2.1. To calculate HC mass emission for compression-ignition engines, the arithmetic average HC concentration shall be calculated using the following equation:
              where:
                      is the integral of the recording of the heated FID over the test (t1 to t2);
                      is the concentration of HC measured in the diluted exhaust in ppm of  and is substituted for  in all relevant equations.
              3.2.2.1.1. Dilution air concentration of HC shall be determined from the dilution air bags. Correction shall be carried out according to paragraph 3.2.1.1. of this annex.
              3.2.3. Fuel consumption, fuel efficiency and CO2 calculations for individual vehicles in an interpolation family
              3.2.3.1. Fuel consumption, fuel efficiency and CO2 emissions without