Symbols for test parameters. Symbol AP Unit m² Term Cross sectional area of the isokinetic sampling probe AT m² Cross sectional area of the exhaust pipe CEE - Ethane efficiency CEM C1 conc D0 DF D E - - ppm m³/s - - - / vol% Methane efficiency Carbon 1 equivalent hydrocarbon Subscript denoting concentration Intercept of PDP calibration function Dilution factor Bessel function constant Bessel function constant EZ fa g/kWh - Interpolated NOx emission of the control point Laboratory atmospheric factor fc FFH FS s-1 - - Bessel filter cut-off frequency Fuel specific factor for the calculation of wet concentration for dry concentration Stoichiometric factor GAIRW kg/h Intake air mass flow rate on wet basis GAIRD kg/h Intake air mass flow rate on dry basis GDILW kg/h Dilution air mass flow rate on wet basis GEDFW kg/h Equivalent diluted exhaust gas mass flow rate on wet basis Symbol Unit Term GEXHW kg/h Exhaust gas mass flow rate on wet basis GFUEL kg/h Fuel mass flow rate GTOTW kg/h Diluted exhaust gas mass flow rate on wet H MJ/m³ basis Calorific value HREF g/kg Reference value of absolute humidity Ha g/kg (10.71g/kg) Absolute humidity of the intake air Hd g/kg Absolute humidity of the dilution air HTCRAT mol/mol Hydrogen-to-Carbon ratio i - Subscript denoting an individual mode K - Bessel constant k m-1 Light absorption coefficient KH,D - Humidity correction factor for NOx for diesel engines KH,G - Humidity correction factor for NOx for gas engines KV CFV calibration function KW,a - Dry to wet correction factor for the intake air KW,d - Dry to wet correction factor for the dilution air KW,e - Dry to wet correction factor for the diluted exhaust gas KW,r - Dry to wet correction factor for the raw exhaust gas L % Percent torque related to the maximum torque for the test engine La m Effective optical path length m Slope of PDP calibration function mass g/h or g Subscript denoting emissions mass flow
Symbols for test parameters. Symbol Unit Term Ap m2 Cross-sectional area of the isokinetic sampling probe. m3/h volume flow; kg/h mass flow; g/kWh specific emission.
Symbols for test parameters. Symbol Unit Term Ap m2 Cross sectional area of the isokinetic sampling probe Ae m2 Cross sectional area of the exhaust pipe c ppm/vol. Concentration per cent Cd — Discharge coefficient of SSV-CVS C1 — Carbon 1 equivalent hydrocarbon
