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Erschienen in:
Bioenergy Economics and Policy: Introduction and Overview Kapitel lesen Erstes Kapitel lesen

2010 | OriginalPaper | Buchkapitel

2. Are Biofuels the Best Use of Sunlight?

verfasst von : Gerald C. Nelson

Erschienen in: Handbook of Bioenergy Economics and Policy

Verlag: Springer New York

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Abstract

Biofuels are liquid sunlight. In effect, we use plants to convert raw solar energy into a liquid (ethanol or biodiesel) that can be used as an energy source for our transportation systems. The question this chapter asks is whether this conversion process is the best way to make use of solar energy. Photovoltaics clearly dominate plants in terms of technical conversion efficiency, with conversion rates for commercial cells of the mid-2000s that are 2–10 times higher than plants and operate throughout the year rather than just during the growing season. But photovoltaics provide electricity, which is not currently cost-effective for use in transportation. As research into photovoltaics and battery technology is still in its infancy, the potential for commercially viable technology breakthroughs seems high.

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Vorheriges Kapitel Bioenergy Economics and Policy: Introduction and Overview
Nächstes Kapitel Perennial Grasses as Second-Generation Sustainable Feedstocks Without Conflict with Food Production
Fußnoten
1
The units used to report energy density of various sources vary. Biofuels energy densities are often reported in megajoules (MJ) or British thermal units (btu). Electricity is reported in kilowatt hours (kWh). One kWh is equivalent to 0.278 mj and 3,412 btus.
 
2
“Photovoltaic efficiency is calculated using the ratio of the maximum power point, P m , divided by the input light irradiance (E, in W/m²) under standard test conditions (STC) and the surface area of the solar cell (A c in m²).” (Source: http://​en.​wikipedia.​org/​wiki/​Solar_​cell)
 
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Metadaten
Titel
Are Biofuels the Best Use of Sunlight?
verfasst von
Gerald C. Nelson
Copyright-Jahr
2010
Verlag
Springer New York
Buch
Handbook of Bioenergy Economics and Policy

Print ISBN: 978-1-4419-0368-6

Electronic ISBN: 978-1-4419-0369-3

Copyright-Jahr: 2010

DOI
https://doi.org/10.1007/978-1-4419-0369-3_2

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