Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:20:p16
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 20 (pt 16/29)
Character Range: 261672–266010

flow rate extracted from dilution tunnel

qmf        kg/s                            Fuel mass flow rate

qmp        kg/s                            Sample flow of exhaust gas into partial flow dilution system

qsw        kg/s                            Mass flow rate fed back into dilution tunnel to compensate for particle number sample extraction

qvCVS      m³/s                            CVS volume rate

qvs        dm³/min                         System flow rate of exhaust analyzer system

qvt        cm³/min                         Tracer gas flow rate

r2         -                               Coefficient of determination

rd         -                               Dilution ratio

rD         -                               Diameter ratio of SSV

rh         -                               Hydrocarbon response factor of the FID

rm         -                               Methanol response factor of the FID

rp         -                               Pressure ratio of SSV

rs         -                               Average sample ratio

s                                          Standard deviation

          kg/m³                           Density

e         kg/m³                           Exhaust gas density

          -                               Standard deviation

T          K                               Absolute temperature

Ta         K                               Absolute temperature of the intake air

t          s                               Time

t10        s                               Time between step input and 10 per cent of final reading

t50        s                               Time between step input and 50 per cent of final reading

t90        s                               Time between step input and 90 per cent of final reading

u          -                               Ratio between the densities (or molar masses) of the gas components and the exhaust gas divided by 1,000

V0         m3/r                            PDP gas volume pumped per revolution
Vs         dm³                             System volume of exhaust analyzer bench

Wact       kWh                             Actual cycle work of the test cycle

Wact,cold  kWh                             The actual cycle work over the WHTC cold test cycle according to paragraph 7.8.6.

Wact, hot  kWh                             The actual cycle work over the WHTC hot test cycle according to paragraph 7.8.6.

Wref       kWh                             Reference cycle work of the test cycle

X0         m3/r                            PDP calibration function

3.3. Symbols and abbreviations for the fuel composition

wALF                           Hydrogen content of fuel, per cent mass

wBET                           Carbon content of fuel, per cent mass

wGAM                           Sulphur content of fuel, per cent mass

wDEL                           Nitrogen content of fuel, per cent mass

wEPS                           Oxygen content of fuel, per cent mass

                              Molar hydrogen ratio (H/C)

                              Molar sulphur ratio (S/C)

                              Molar nitrogen ratio (N/C)

                              Molar oxygen ratio (O/C)

referring to a fuel CHONS

3.4. Symbols and abbreviations for the chemical components
C1    Carbon 1 equivalent hydrocarbon

CH4   Methane

C2H6  Ethane

C3H8  Propane

CO    Carbon monoxide

CO2   Carbon dioxide

DOP   Di-octylphtalate

HC    Hydrocarbons

H2O   Water

NMHC  Non-methane hydrocarbons

NOx   Oxides of nitrogen

NO    Nitric oxide

NO2   Nitrogen dioxide

PM    Particulate matter

              3.5. Abbreviations

CFV          Critical flow venturi

CLD          Chemiluminescent detector

CVS          Constant volume sampling

deNOx        NOx after-treatment system

EGR          Exhaust gas recirculation

ET           Evaporation tube

FID          Flame ionization detector

FTIR         Fourier transform infrared analyser

GC           Gas chromatograph

HCLD         Heated chemiluminescent detector

HFID         Heated flame ionization detector

LDS          Laser diode spectrometer

LPG          Liquefied petroleum gas

NDIR         Non-dispersive infrared (analyzer)

NG           Natural gas

NMC          Non-methane cutter

OT           Outlet tube