Use the accompanying figure to answer the following question. The figure below s
ID: 278823 • Letter: U
Question
Use the accompanying figure to answer the following question. The figure below shows the energy input and output for several types of biofuels. LIHD stands for low-input, high- diversity native plant species mixes that can be grown on land that is unfit for conventional crops Current biofuels Delivered energy outputs Outputs: Energy produced) 100 90 80 70 60 50 40 30 20 10 Biofuel (ethanol or biodiesel) Nonfuel products (used for other purposes such as feed) LIHD prairie bioenergy on degraded soil Fossil energy inputs (Inputs- Energy consumed) Farming Corn grain Soybean Biomass Biomass Biomass ethanol biodiese combustion ethanol biodiesel Fuel conversion process Infegraphic 254 part Envisonmental Science for a Changing World 2013W.H. Freeman and Company Which biofuel has the highest EROI (energy returned on energy invested)? Biomass biodiesel Corn grain ethanol Soybean biodiesel Biomass ethanolExplanation / Answer
To find EROI, we need to clarify certain information from the graph.
Now, lets analyze each source.
1. Corn grain ethanol:
Energy input = 75 units
Energy output = 92 units
EROI = Energy output / Energy input = 92/75 = 1.2267
2. Soy bean biodiesel:
Energy input = 15 units
Energy output = 30 units
EROI = Energy output / Energy input = 30/152 = 2
3. Biomass ethanol:
Energy input = 5 units
Energy output = 23 units
EROI = Energy output / Energy input = 23/5 = 4.6
4. Biomass biodiesel:
Energy input = 5 units
Energy output = 35 units
EROI = Energy output / Energy input = 35/5 = 7
So Biomass biodiesel provides highest EROI (EROI =7).
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