Abstract
This paper gives an overview of the potential on multi-criteria assessment of fuels. With respective selection of the criteria comprising economy, environment, energy, and renewability indicators, the assessment procedure is adapted for the assessment of cassava-based ethanol (CE) in China. In order to apply the multi-criteria approach to fuels, it was necessary to use the multi-criteria procedure based on the cost of net energy taking into account the renewability (CNER) index rating composed of linear aggregative functions of cost of net energy (CNE) and renewability indicator with weights. CNER λ and CNER R of a fuel are proposed, respectively. The evaluation of CE was performed under constraint expressing no-numeric relation between the two factors (CNE and renewability indicators). Three cases were analyzed. The results showed that when the priority is given to renewability CE has a better performance than conventional gasoline (CG). However, when the two factors have the same priority or priority given to CNE, CG has a better performance than CE. The different values of CNER λ and CNER R obtained in the case study showed that taking into account the renewability of a fuel is difficult and depends strongly on personal interpretation.
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