Publication DetailsTitle : Updated Sugarcane and Switchgrass Parameters in the GREET Model
Publication Date : October 10, 2011
Authors : J. B. Dunn, J. Eason, M Q. Wang
Abstract : The feedstock from which a biofuel derives can have a significant effect on its life-cycle energy consumption and emissions of greenhouse gases (GHG). The aim of this document is to describe our approach to developing GREET parameters for key facets of sugarcane and switchgrass feedstocks that affect their life-cycle air emissions and energy consumption from the field (including the upstream energy to manufacture agricultural inputs such as fertilizer) to the conversion facility gate in the case of switchgrass. For sugarcane ethanol, we also revise aspects of the fuel's life cycle pertaining to the conversion facility including ethanol yield and embodied energy in the sugarcane mill buildings and equipment. A summary of data sources for corn stover and forest residue are provided elsewhere (Han et al. 2011). Note that although this document discusses switchgrass in the context of ethanol production, this crop could also be a feed to a process that directly produces hydrocarbon fuels, such as fast pyrolysis.