Calculation of EROEI Assignment_Nelson.docx

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Sustainability 310 Renewable Energy: Science, Technology & Management Calculation of EROEI Assignment The purpose of this exercise is to introduce the concept of EROEI (net energy) and provide an opportunity to calculate its value from data regarding energy expended and manufactured in the production of ethanol. To prepare the calculation, review the Tutorial in the Week 7 Lecture and the following two articles from Doc Sharing. 1. "Should EROEI be the most important criterion our society uses to decide how it meets its energy needs?" 2. "How Much Energy Does It Take to Make a Gallon of Ethanol?" Use the table and formulas below to calculate your answer. Table 1: Energy Used to Make Ethanol From Corn and Cellulose (Btus per Gallon of Ethanol) Corn Ethanol (Industry Average) Corn Ethanol (Industry Best) Corn Ethanol (State-of-the-Art) Cellulosic Crop- Based Ethanol Fertilizer 12,981 7,542 3,869 3,549 Pesticide 1,060 643 406 437 Fuel 2,651 1,565 1,321 8,120 Irrigation 7,046 6,624 6,046 -- Other (Feedstock) 3,395 3,248 3,122 2,558 Total (feedstock) 27,134 19,622 14,765 14,663 Process Steam 36,732 28,201 26,185 49,075 Electricity 14,444 7,300 5,148 8,925 Bulk Transport 1,330 1,100 800

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