Efficiency and CO2 emission analysis of pathways by which methane can provide transportation services

TitleEfficiency and CO2 emission analysis of pathways by which methane can provide transportation services
Publication TypeJournal Article
Year of Publication1992
AuthorsCrane, P, Scott DS
JournalInternational Journal of Hydrogen Energy
Volume17
Issue7
Pagination543-550
ISBN Number0360-3199
Abstract

Methane is expected to have an increasingly important role as an energy source in the future. As a result, methane will become a major energy source for the transportation sector. Future energy systems will also be selected for efficiency and environmental gentility. Six candidate pathways by which the energy for service transportation can be provided, using methane as the sole energy source, are proposed and are compared with the use of gasoline from petroleum. These pathways involve methanol, methane and hydrogen used in spark ignition engines and solid polymer fuel cells. The energy conversion processes in each pathway are analysed based on the second law of thermodynamics. Two performance criteria are used: total energy input to the pathway and total carbon dioxide produced along the pathway. All results are normalized to a unit of transportation service, in this case 1 km of city driving. A surprising result is that the methanol spark ignition engine pathway is the least efficient and produces the greatest amount of carbon dioxide, of the pathways examined. Hydrogen and fuel cell pathways are found to be optimal using the criteria of this paper.

URLhttp://www.sciencedirect.com/science/article/B6V3F-498M9VJ-RB/2/12a037210b7e20647b76b7511198cf4a