Environmental life-cycle assessment of transit buses with alternative fuel technology

The paper presents a life-cycle assessment of costs and greenhouse gas emissions for transit buses deploying a hybrid input–output model to compare ultra-low sulfur diesel to hybrid diesel-electric, compressed natural gas, and hydrogen fuel-cell. We estimate the costs of emissions reductions from alternative fuel vehicles over the life cycle and examine the sensitivity of the results to changes in fuel prices, passenger demand, and to technological characteristics influencing performance and emissions. We find that the alternative fuel buses reduce operating costs and emissions, but increase life-cycle costs. The infrastructure requirement to deploy and operate alternative fuel buses is critical in the comparison of life-cycle emissions. Additionally, efficient bus choice is sensitive to passenger demand, but only moderately sensitive to technological characteristics, and that the relative efficiency of compressed natural gas buses is more sensitive to changes in fuel prices than that of the other bus types.

[1]  W. Bunn,et al.  An evaluation of criteria for selecting vehicles fueled with diesel or compressed natural gas , 2009 .

[2]  Paul Schimek.  Reducing emissions from transit buses , 2001 .

[3]  Elaine Croft McKenzie.  An Input-Output Framework for the Inclusion of Environmental Impacts in the Design of Goods, Systems, and Services , 2011 .

[4]  Lester B. Lave,et al.  Evaluating automobile fuel/propulsion system technologies , 2003 .

[5]  K. Chandler,et al.  Washington Metropolitan Area Transit Authority: Compressed Natural Gas Transit Bus Evaluation , 2006 .

[6]  Leslie Eudy,et al.  Alameda-Contra Costa Transit District (AC Transit) Fuel Cell Transit Buses: Third Evaluation Report and Appendices , 2008 .

[7]  Joshua T Cohen,et al.  Fuels for urban transit buses: a cost-effectiveness analysis. , 2003, Environmental science & technology.

[8]  A. Elkamel,et al.  An integrated decision support framework for the assessment and analysis of hydrogen production pathways , 2006 .

[9]  Karen G. Shapiro,et al.  Incorporating costs in LCA , 2001 .

[10]  Paulina Jaramillo,et al.  Greenhouse gas implications of using coal for transportation: Life cycle assessment of coal-to-liquids, plug-in hybrids, and hydrogen pathways , 2009 .

[11]  L. Eudy,et al.  Connecticut Transit (CTTRANSIT) Fuel Cell Transit Bus: Second Evaluation Report and Appendices , 2009 .

[12]  L Eudy,et al.  SunLine Transit Agency Fuel Cell Transit Bus: Fourth Evaluation Report , 2009 .

[13]  A. Horvath,et al.  Environmental assessment of passenger transportation should include infrastructure and supply chains , 2009 .

[14]  G. Yohe,et al.  Risk aversion, time preference, and the social cost of carbon , 2009 .