Methane Slip → CO₂-equivalent
Convert measured CH₄ slip (g/kWh) to CO₂-equivalent per GWP100 (AR5 = 28; AR6 = 29.8). Used in FuelEU / IMO LCA accounting.
GWP factor
29.8 -
CO₂-equivalent slip
104.3g CO₂eq/kWh
Formula, assumptions, and limits
LNG Otto-DF 2-stroke: ~2–3 g/kWh slip → 60–90 g CO₂eq/kWh. Otto-DF 4-stroke: ~3–5 g/kWh → 90–150. LBSI pure-gas: 0.2–0.6 g/kWh. Diesel-cycle HPDF: 0.1–0.3 g/kWh. The GWP20 view (84) shows the near-term climate impact which climate science increasingly prefers.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Methane slip | g/kWh | ISO 8178 D2 / test-bed | |
| Global-warming potential per IPCC | - | IPCC AR5 or AR6 |