Division 3.3.3 Fuel properties
United Kingdom
The general chemical formula of fuel is CH α O β S γ N δ with α atomic hydrogen-to-carbon ratio (H/C), β atomic oxygen-to-carbon ratio (O/C), γ atomic sulphur-to-carbon ratio (S/C) and δ atomic nitrogen-to-carbon ratio (N/C). Based on this formula the carbon mass fraction of fuel w C can be calculated. In case of diesel fuel the simple formula CH α O β may be used. Default values for fuel composition may be derived from Table 7.3:
Table 7.3
Default values of atomic hydrogen-to-carbon ratio, α, atomic oxygen-to-carbon ratio, β, atomic sulphur-to-carbon ratio, γ, atomic nitrogen-to-carbon ratio, δ, and carbon mass fraction of fuel, w C for reference fuels
| Fuel | Atomic hydrogen, oxygen, sulphur and nitrogen-to-carbon ratiosCHαOβSγNδ | Carbon mass concentration, w C[g/g] |
|---|---|---|
| Diesel (non-road gas-oil) | CH1,80O0S0N0 | 0,869 |
| Ethanol for dedicated compression ignition engines (ED95) | CH2,92O0,46S0N0 | 0,538 |
| Petrol (E10) | CH1,92O0,03S0N0 | 0,833 |
| Petrol (E0) | CH1,85O0S0N0 | 0,866 |
| Ethanol (E85) | CH2,73O0,36S0N0 | 0,576 |
| LPG | CH2,64O0S0N0 | 0,819 |
| Natural Gas/Biomethane | CH3,78O0,016S0N0 | 0,747 |