Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:20:p14
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 20 (pt 14/29)
Character Range: 253488–257874

of particle concentration in the diluted gas exhaust from the particle counter, corrected for coincidence and to standard conditions (273.2 K and 101.33 kPa)
d          m                               Diameter
di                                         Particle electrical mobility diameter (30, 50 or 100 nm)
dV         m                               Throat diameter of venturi
D0         m3/s                            PDP calibration intercept
D          -                               Dilution factor
t         s                               Time interval

e                                          The number of particles emitted per kWh

egas       g/kWh                           Specific emission of gaseous components

ePM        g/kWh                           Specific emission of particulates

er         g/kWh                           Specific emission during regeneration

ew         g/kWh                           Weighted specific emission

ECO2       per cent                        CO2 quench of NOx analyzer

EE         per cent                        Ethane efficiency

EH2O       per cent                        Water quench of NOx analyzer

EM         per cent                        Methane efficiency

ENOx       per cent                        Efficiency of NOx converter

f          Hz                              Data sampling rate

fa         -                               Laboratory atmospheric factor

Fs         -                               Stoichiometric factor
           -                               Mean particle concentration reduction factor of the volatile particle remover specific to the dilution settings used for the test
Ha         g/kg                            Absolute humidity of the intake air

Hd         g/kg                            Absolute humidity of the diluent

i          -                               Subscript denoting an instantaneous measurement (e.g. 1 Hz)

k          -                               Calibration factor to correct the particle number counter measurements to the level of the reference instrument where this is not applied internally within the particle number counter. Where the calibration factor is applied internally within the particle number counter, a value of 1 shall be used for k in the above equation

kc         -                               Carbon specific factor

kf,d       m3/kg fuel                      Combustion additional volume of dry exhaust

kf,w       m3/kg fuel                      Combustion additional volume of wet exhaust

kh,D       -                               Humidity correction factor for NOx for CI engines

kh,G       -                               Humidity correction factor for NOx for PI engines

kr         -                               The regeneration adjustment, according to paragraph 6.6.2., or in the case of engines without periodically regenerating after-treatment kr = 1

kr,d-      -                               Downward regeneration adjustment factor

kr,u       -                               Upward regeneration adjustment factor

kw,a       -                               Dry to wet correction factor for the intake air

kw,d       -                               Dry to wet correction factor for the diluent

kw,e       -                               Dry to wet correction factor for the diluted exhaust gas

kw,r       -                               Dry to wet correction factor for the raw exhaust gas

KV         -                               CFV calibration function
          -                               Excess air ratio

mb         mg                              Particulate sample mass of the diluent collected
md         kg                              Mass of the diluent sample passed through the particulate sampling filters
med        kg                              Total diluted exhaust mass over the cycle
medf       kg                              Mass of equivalent diluted exhaust gas over the test cycle

mew        kg                              Total exhaust mass over the cycle
mex        kg                              Total mass of diluted exhaust gas extracted from the dilution tunnel for particle number sampling
mf         mg                              Particulate sampling filter mass

mgas       g                               Mass of gaseous emissions over the test cycle