Energía y Ambiente (ITBA-KIT)

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Browsing Energía y Ambiente (ITBA-KIT) by Author "Britz, Sven"

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    Feasibility study of hydrogen fueled internal combustion hybrid bus operating under real traffic urban conditions in Buenos Aires, Argentina
    (2018-12-18) Britz, Sven; Orbaiz, Pedro
    "This thesis evaluates the technical, economic and environmental performance of a hydrogen fueled hybrid bus, which uses an internal combustion engine as a power unit. Results are compared to those of a conventional diesel bus and to those of two commercially available hydrogen fuel cell buses. The performance of the different vehicles, under real driving conditions, is evaluated using validated models of these on the Autonomie simulation platform. On the other hand, the life-cycle GHG emissions of the buses are estimated with hydrogen being produced from different primary sources. Whilst the first scenario assumes that hydrogen is produced from natural gas via steam methane reforming, the other three assumes electrolytic production using different electricity production mixes. Finally the total cost of ownership of each hybrid bus is calculated and compared to that of the conventional bus. Results show that all hydrogen buses have a considerable lower energy consumption than that of the conventional vehicle. This is manly due to the use of the hybrid powertrain architecture. When comparing the different hydrogen buses, as expected, the fuel cell vehicles result in a higher efficiency than the internal combustion engine vehicles, but in a considerable higher cost, making the use of internal combustion engines a more cost effective way to reduce GHG emissions. The life cycle emission analysis shows that the environmental performance of all hydrogen vehicles is highly dependent on the carbon intensity of the hydrogen production. Overall, whilst fuel cells are more efficient than ICEs, the considerable lower cost of ICEs makes the H2ICE hybrid bus a more cost effective way of reducing GHG emissions."