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Examining the Optimal Fuel Type for Urban Bus Operations
Public service fleets offer an attractive option for introducing renewable fuels and alternative technologies on a large scale, which allow for the reduction of both greenhouse gas emissions and exhaust air pollutants. This paper ex amines the use of biomethane (bio-CNG) and compressed natural gas (CNG) for part of the bus fleet in Dublin. Dublin is typical of many international urban centres with a large bus fleet; therefore the results detailed in this paper could be applied to other urban bus fleets. The emissions produced from the 2008 fleet based at one of the city?s seven bus depots were compared to use of new diesel and bio-CNG buses, which were modelled using COPERT 4, a road transport emissions model developed by the European Commission. The optimum feedstock for bio-CNG production in Ireland was investigated, as well as the quantity of feedstock needed to produce t he required bio-CNG to fuel the bus fleet examined. The merits of producing bio-CNG in Ireland were analysed in order to determine the best policy. As expected the results showed a substantial decrease in all exhaust emissions from the use of bio-CNG buses compared the 2008 fleet. Grass silage was chosen as the optimum feedstock for production of bio-CNG in Ireland, and it was calculated using a sensitivity analysis that 1,349 ha is the land take needed to produce the grass silage for bio-CNG required to run the bus fleet examined.
Keyword(s): Renewable fuels; Smart & Sustainable Planet
Publication Date:
Type: Conference item
Peer-Reviewed: Yes
Language(s): English
Institution: Trinity College Dublin
Citation(s): Ryan, F., Caulfield, B., Examining the Optimal Fuel Type for Urban Bus Operations, 89th Annual Meeting of the Transportation Research Board,, Washington D.C., 2010, CDROM
Alternative Title(s): 89th Annual Meeting of the Transportation Research Board,
First Indexed: 2014-08-02 05:41:19 Last Updated: 2019-11-29 06:40:40