Document ID: chunk:federal_register_of_legislation:F2024L00446:reg:23:p2
Version: federal_register_of_legislation:F2024L00446
Segment Type: reg
Provision Reference: reg 23 (pt 2/15)
Character Range: 1902043–1905110

hydrocarbons, grams;

                  MHC,out is the mass of hydrocarbons exiting the enclosure in the case of fixed volume enclosures for diurnal emission testing, grams;

                  MHC,in  is the mass of hydrocarbon entering the enclosure in the case of fixed volume enclosures for diurnal emission testing, grams;

                  CHC  is the measured hydrocarbon concentration in the enclosure, ppm volume in C1 equivalent;

                  V  is the net enclosure volume corrected for the volume of the vehicle with the windows and the luggage compartment open, m3. If the volume of the vehicle is not known, a volume of 1.42 m3 shall be subtracted;

                  T  is the ambient chamber temperature, K;

                  P  is the barometric pressure, kPa;

                  H/C  is the hydrogen to carbon ratio

                  where:

                  H/C is taken to be 2.33 for puff loss overflow measurement in SHED and diurnal test losses;

                  H/C is taken to be 2.20 for hot soak losses;

                  H/C is taken to be 2.67 for calibration;

                  k  is 1.2 × 10-4 × (12 + H/C), (g × K/(m³ × kPa));

                  i  is the initial reading;

                  f  is the final reading;

              7.1.1. As an alternative to the equation in paragraph 7.1. of this annex, for variable volume enclosures the following equation may be used at the choice of the manufacturer:

               MHC
where:
MHC  is the mass of hydrocarbons, grams;
CHC  is the measured hydrocarbon concentration in the enclosure, ppm volume in C1 equivalent;
V  is the net enclosure volume corrected for the volume of the vehicle with the windows and the luggage compartment open, m3. If the volume of the vehicle is not known, a volume of 1.42 m3 shall be subtracted;
Ti is the initial ambient chamber temperature, K;
Pi is the initial barometric pressure, kPa;
H/C  is the hydrogen to carbon ratio;
H/C is taken to be 2.33 for puff loss overflow measurement in SHED and diurnal test losses;
H/C is taken to be 2.20 for hot soak losses;
                     H/C is taken to be 2.67 for calibration;

                  k  is 1.2 × 10-4 × (12 + H/C), (g × K/(m³ × kPa));
i  is the initial reading;
                  f  is the final reading.
              7.2. The result of (MHS + MD1 + MD2 + (2 × PF)) shall be below the limit defined in paragraph 6.6.2. of this Regulation.
              8. Test report
              The test report shall contain at least the following:
                  (a) Description of the soak periods, including time and mean  temperatures;
                  (b) Description of aged carbon canister used and reference to exact ageing report;
                  (c) Mean temperature during the hot soak test;
                  (d) Measurement during hot soak test, HSL;
                  (e) Measurement of first diurnal, DL1st day;
                  (f) Measurement of second diurnal, DL2nd day;
                  (g) Final evaporative test result, calculated according to paragraph 7. of