LNG - Well-to-Wake by engine pathway
Three LNG pathways with dramatically different WtW intensities. Otto MS suffers from 5.5 g/kWh methane slip; Diesel cycle has almost none.
Tank-to-wake CO₂
2,750.00t
From Cf per MEPC.364(79)
Energy content
48,000GJ
LCV 48.0 MJ/kg
Well-to-wake GHG
3,192.0t CO₂e
66.5 gCO₂e/MJ WtW
Method
TTW CO₂ (t) = mass × Cf Energy (MJ) = mass (kg) × LCV (MJ/kg) WtW (t CO₂e) = Energy (MJ) × WtW factor (g/MJ) / 1e6
WtW factors include upstream extraction, processing, transport, plus tank-to-wake combustion and relevant CH₄/N₂O. FuelEU Maritime Annex II publishes the authoritative defaults.