Division 2.2.3 Component specific factor u

United Kingdom

The component specific factor u _gas of diluted gas can either be calculated by means of equation (7-34) or be taken from Table 7.2; in Table 7.2 the density of the diluted exhaust gas has been assumed equal to air density.

u = \frac{M_{gas}}{M_{d,w} \times 1000} = \frac{M_{gas}}{[M_{da,w} \times (1 - \frac{1}{D}) + M_{r,w} \times (\frac{1}{D})] \times 1000}

(7-34)

Where:

M _gas

molar mass of the gas component [g/mol]

M _d,w

molar mass of diluted exhaust gas [g/mol]

F1M _da,w

molar mass of dilution air [g/mol] (see equation (7-144) of point 3.9.3)

M _r,w

molar mass of raw exhaust gas [g/mol] (see Appendix 2 point (5)

dilution factor [see equation (7-28) of point 2.2.2.2] [-]

Table 7.2

Diluted exhaust gas u values (for emission concentration expressed in ppm) and component densities

Fuel	ρ_e			Gas
Depending on fuel.
At λ = 2, dry air, 273 K, 101,3 kPa.
u accurate within 0,2 % for mass composition of: C = 66 – 76 %; H = 22 – 25 %; N = 0 – 12 %.
NMHC on the basis of CH_2,93 (for total HC the u _gas coefficient of CH₄ shall be used).
u accurate within 0,2 % for mass composition of: C3 = 70 – 90 %; C4 = 10 – 30 %.
		NO_x	CO	HC	CO₂	O₂	CH₄
				ρ_gas [kg/m³]
		2,053	1,250	^f1	1,9636	1,4277	0,716
				u_gas ^f2
Diesel (non-road gas-oil)	1,2943	0,001586	0,000966	0,000482	0,001517	0,001103	0,000553
Ethanol for dedicated compression ignition engines (ED95)	1,2768	0,001609	0,000980	0,000780	0,001539	0,001119	0,000561
Natural gas / bio-methane^f3	1,2661	0,001621	0,000987	0,000528^f4	0,001551	0,001128	0,000565
Propane	1,2805	0,001603	0,000976	0,000512	0,001533	0,001115	0,000559
Butane	1,2832	0,001600	0,000974	0,000505	0,001530	0,001113	0,000558
LPG^f5	1,2811	0,001602	0,000976	0,000510	0,001533	0,001115	0,000559
Petrol (E10)	1,2931	0,001587	0,000966	0,000499	0,001518	0,001104	0,000553
Ethanol (E85)	1,2797	0,001604	0,000977	0,000730	0,001534	0,001116	0,000559

Annotations

Textual amendments

F1: Substituted by Commission Delegated Regulation (EU) 2018/989 of 18 May 2018 amending and correcting Delegated Regulation (EU) 2017/654 supplementing Regulation (EU) 2016/1628 of the European Parliament and of the Council with regard to technical and general requirements relating to emission limits and type-approval for internal combustion engines for non-road mobile machinery (Text with EEA relevance).

Footnotes

f1: Depending on fuel.
f2: At λ = 2, dry air, 273 K, 101,3 kPa.
f3: u accurate within 0,2 % for mass composition of: C = 66 – 76 %; H = 22 – 25 %; N = 0 – 12 %.
f4: NMHC on the basis of CH_2,93 (for total HC the u _gas coefficient of CH₄ shall be used).
f5: u accurate within 0,2 % for mass composition of: C3 = 70 – 90 %; C4 = 10 – 30 %.