Evaluation of Biofuel Production Using Energy and Exergy Analyses—Introduction of a System Design Concept for Achieving Final Benefits—

概要

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Evaluation functions for minimizing the disparity between energy supply and demand and reducing the field area for biomass production, which are based on energy benefits, were proposed in a system design for biofuel production. An Exergy Profit Ratio (ExPR) and an extended the Energy Profit Ratio (EPR) were also proposed to measure the quality and availability of energy for the biofuel plant in Utsunomiya City in Tochigi Prefecture, Japan. In the calculation of minimum field area of biomass production based on societal demand in household of Utsunomiya City, 17,500 ha was the minimum value by the evaluation function by energy (Esystem) and 29,500 ha was the minimum value by the evaluation function by exergy (EsystemEX) under the case of lighting: 100% electricity; heating: 89% electricity and 11% of vapor. On the other hand, 17,000 ha was the minimum value by Esystem and 29,000 ha was the minimum value by EsystemEX under the case of lighting: 100% electricity; heating: 100% electricity and 100% of vapor. Thus, if EPR and Esystem of bio-ethanol & electricity production were underestimated for a minimum field area, then ExPR and EsystemEX could be used to maintain the results of introducing biofuel production to prevent field area shortages for biofuel production.
農業情報学会の論文