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Is bioethanol a sustainable energy source? An energy-, exergy-, and emergy-based thermodynamic system analysis

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  • Liao, Wenjie
  • Heijungs, Reinout
  • Huppes, Gjalt

Abstract

Biofuels are widely seen as substitutes for fossil fuels to offset the imminent decline of oil production and to mitigate the emergent increase in GHG emissions. This view is, however, based on too simple an analysis, focusing on only one piece in the whole mosaic of the complex biofuel techno-system, and such partial approaches may easily lead to ideological bias based on political preference. This study defines the whole biofuel techno-system at three scales, i.e., the foreground production (A), the background industrial network (B, including A), and the supporting Earth biosphere (C, including B). The thermodynamic concepts of energy, exergy and emergy measure various flows at these three scales, viz. primary resources, energy and materials products, and labor and services. Our approach resolves the confusion about scale and metric: direct energy demand and direct exergy demand apply at scale A; cumulative energy demand and cumulative exergy demand apply at scale B; and energy is applied at scale C, where it is named emergy, while exergy also can be applied at scale C. This last option was not examined in the present study.

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  • Liao, Wenjie & Heijungs, Reinout & Huppes, Gjalt, 2011. "Is bioethanol a sustainable energy source? An energy-, exergy-, and emergy-based thermodynamic system analysis," Renewable Energy, Elsevier, vol. 36(12), pages 3479-3487.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:12:p:3479-3487
    DOI: 10.1016/j.renene.2011.05.030
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