Pump-to-Wheels Methane Emissions from the Heavy-Duty Transportation Sector

摘要: Pump-to-wheels (PTW) methane emissions from the heavy-duty (HD) transportation sector, which have climate change implications, are poorly documented. In this study, HD natural gas fueled vehicles and compressed (CNG) liquefied (LNG) fueling stations that serve them were characterized. A novel measurement system was developed to quantify leaks losses. Engine related characterized twenty-two transit buses, refuse trucks, over-the-road (OTR) tractors. Losses six LNG eight CNG during compression, fuel delivery, storage, leaks. Cryogenic boil-off pressure rise control venting storage tanks using theoretical empirical modeling. Field laboratory observations of used for model development evaluation. PTW combined with a specific scenario view as percent of...