Featured Research

from universities, journals, and other organizations

Comparing Alternative Fuels For Cars

Date:
April 29, 2007
Source:
Inderscience Publishers
Summary:
Norwegian scientists have drawn up a table of alternative fuels for cars. Their analysis is based on a well-to-wheel approach that takes into account manufacturing, energy use, greenhouse gas emissions, and local and regional pollutants. The researchers put natural gas conversion into hydrogen for fuel cells at top of the list.

Norwegian scientists have drawn up a league table of alternative fuels for cars. Their analysis is based on a well-to-wheel approach that takes into account manufacturing, energy use, greenhouse gas emissions, and local and regional pollutants.

Related Articles


Bottom of the table, unsurprisingly, are petrol vehicles, but coming in a close second last are hybrid vehicles that can run on compressed natural gas or petrol. Top of their league are fuel cell powered vehicles using hydrogen gas obtained from natural gas methane.

Karl Hψyer of Oslo University College and Erling Holden of Western Norway Research Institute, Norway, and reported in Inderscience's International Journal of Alternative Propulsion their analysis of fuel chains including petrol, natural gas, and alternative fuel sources such as methanol and ethanol, hydrogen and biofuels.

"Alternative fuels are not in themselves a road towards sustainable mobility," the researchers say. However, their analysis places petrol and hybrid vehicles firmly at the bottom of the league table when all energy factors from source to consumer use are taken into account. "Any alternative fuel we considered is better than the cars that are used mostly today," they add.

Currently, there is no consensus regarding sustainable transport development. Even if a particular energy reduction goal is set for the transport sector there is no agreement on actions that should be taken to achieve this goal. Different lobbying groups have different approaches to the problem and opponents of any particular approach can usually find evidence to suggest a particular approach is not sustainable. The ongoing biofuel debate is a case in point.

Nevertheless, there are several factors that must be considered in assessing a particular alternative fuel: the efficiency route, the substitution route and the reduction route. Each has its strong defenders, say Hψyer and Holden, but in reality there are substantial grey areas between them. One important facet of the debate that is often overlooked, is to ensure the three impact categories - energy use, carbon emissions, and nitrogen oxide pollution - are considered together. "This is a highly problematic task and should only be carried out with great care," the team adds.

They used a simple ranking system to create their league table, based on giving each energy form a weight from 1 to 16 depending on its impact in these three areas. When the weights are added up from well to wheel, they provide an overall value for each energy chain. For example, extraction of natural gas, processing into liquefied hydrogen, storage, and end use in a fuel cell car. The energy chains giving the lowest sum-figures are the highest in the league table and those with largest figures are considered potentially the most environmentally harmful.

Interestingly, the team's analysis puts a fossil-based alternative, natural gas conversion into hydrogen for fuel cells at the top of the list. In contrast the direct use of natural gas in hybrid cars is lower down the list in terms of efficiency, energy, and pollution. Biological methanol for use in fuel cell vehicles is way down the list despite biomethanol being a potentially renewable resource unlike natural gas. "It must be emphasised that no single chain comes out with the best score on all impact categories," the researchers say, "There are always some sorts of trade offs involved. Thus, there are no obvious winners; only good or bad trade offs between different impact categories."

Reference: Int. J. Alternative Propulsion, Vol. 1, No. 4, 2007 pp 352-368


Story Source:

The above story is based on materials provided by Inderscience Publishers. Note: Materials may be edited for content and length.


Cite This Page:

Inderscience Publishers. "Comparing Alternative Fuels For Cars." ScienceDaily. ScienceDaily, 29 April 2007. <www.sciencedaily.com/releases/2007/04/070427103843.htm>.
Inderscience Publishers. (2007, April 29). Comparing Alternative Fuels For Cars. ScienceDaily. Retrieved April 19, 2015 from www.sciencedaily.com/releases/2007/04/070427103843.htm
Inderscience Publishers. "Comparing Alternative Fuels For Cars." ScienceDaily. www.sciencedaily.com/releases/2007/04/070427103843.htm (accessed April 19, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Sunday, April 19, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Nervous Return to Everest a Year After Deadly Avalanche

Nervous Return to Everest a Year After Deadly Avalanche

AFP (Apr. 18, 2015) — In the Himalayan town of Lukla, excitement mingles with fear as mountaineers make their way up to Everest a year after an avalanche killed 16 guides and triggered an unprecedented shut-down of the world&apos;s highest peak. Duration: 00:37 Video provided by AFP
Powered by NewsLook.com
L.A. Water Cops Remind Residents of Water Conservation

L.A. Water Cops Remind Residents of Water Conservation

Reuters - US Online Video (Apr. 18, 2015) — "Water cops" in Los Angeles remind the public about water conservation methods amid California&apos;s prolonged drought. Julie Noce reports. Video provided by Reuters
Powered by NewsLook.com
Planet Defence Conference Tackles Asteroid Threat

Planet Defence Conference Tackles Asteroid Threat

AFP (Apr. 17, 2015) — Scientists gathered at a European Space Agency (ESA) facility outside Rome this week for the Planetary Defence Conference 2015 to discuss how to tackle the potential threat from asteroids hitting Earth. Duration: 00:54 Video provided by AFP
Powered by NewsLook.com
Gulf Scarred, Resilient 5 Years After BP Spill

Gulf Scarred, Resilient 5 Years After BP Spill

AP (Apr. 17, 2015) — Five years after the Deepwater Horizon spill in the Gulf of Mexico, splotches of oil still dot the seafloor and wads of tarry petroleum-smelling material hide in pockets in the marshes of Barataria Bay. (April 17) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins