Comparison of eco-efficiency Sample Clauses

Comparison of eco-efficiency. In this study eco-efficiency is defined as ‘emissions per unit of output’, as in line with the definition made by the World Business Council (Xxxxxxxxxxx, 1992). This represents the environmental intensity of production, thus the lower the eco-efficiency number the better the performance. The total output is defined as the total of all values (summation of the market prices of all the products, expressed in dollar) derived from the refinery. As we account for the total production from the refinery, no allocation of emissions is needed among products. However, for the ‘cradle’ of the analysis, agricultural production, all inputs and emissions need to be allocated between corn and xxxxxx, and in this case economic allocation is applied, as is usual in managerial cost allocation as well. A research question is raised as ‘How are the economic feasibility and environmental performance compared to a single product ethanol production plant?’ In order to project the environmental potential of such a refinery system, the results of eco- efficiency of the biorefinery were compared with the ones from the ethanol plant designed by Xxxx et al. from NREL (Aden et al., 2002). In the ethanol plant corn xxxxxx is converted to ethanol using advanced cellulosic technology, and the steam and electricity required is generated from lignin and wastes. There is no co-product or surplus of electricity; hence ethanol is the only product. In both the biorefinery designed in this study and the ethanol plant designed in NREL advanced technologies have been used and the processes have been optimized. As the capacity of the biorefinery in terms of feedstock handling is twice as high as for the ethanol plant, the capital investment and operating cost of the biorefinery are much higher resulting in incomparable NPV. Nevertheless, the values of IRR from both systems are well comparable. As blends of ethanol and gasoline with different percentage are already used in practice as transport fuels, it is important to also compare the eco-efficiency of biorefinery and ethanol plant with the gasoline refinery. The current market price of gasoline is around $2.70/gallon including excises (EIA). In this comparative study the use phases of all the products are not taken into account.
Sample 1
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