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Ajay K. Gupta and Charles A.S. Hall
This is a review of the literature available on data for the EROI (prior to this special issue) of the following 12 sources of fuel/energy: oil and natural gas, coal, tar sands, shale oil, nuclear, wind, solar, hydropower, geothermal, wave/tidal and corn...
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David J. Murphy, Charles A.S. Hall, Michael Dale and Cutler Cleveland
The main objective of this manuscript is to provide a formal methodology, structure, and nomenclature for EROI analysis that is both consistent, so that all EROI numbers across various processes can be compared, and also flexible, so that changes or addi...
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Charles A.S. Hall
Energy Return on Investment (EROI) refers to how much energy is returned from one unit of energy invested in an energy-producing activity. It is a critical parameter for understanding and ranking different fuels. There were a number of studies on EROI th...
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Megan C. Guilford, Charles A.S. Hall, Peter O?Connor and Cutler J. Cleveland
Oil and gas are the main sources of energy in the United States. Part of their appeal is the high Energy Return on Energy Investment (EROI) when procuring them. We assessed data from the United States Bureau of the Census of Mineral Industries, the Energ...
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Yan Hu, Lianyong Feng, Charles C.S. Hall and Dong Tian
In China there has been considerable discussion of how one should express the efficiency of energy conversion and production. Energy return on investment (EROI) can be useful for this because its methodology is based on outputs and inputs. Unfortunately,...
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Cutler J. Cleveland and Peter A. O?Connor
The two methods of processing synthetic crude from organic marlstone in demonstration or small-scale commercial status in the U.S. are in situ extraction and surface retorting. The considerable uncertainty surrounding the technological character...
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Mohammad Vaferi, Kayvan Pazouki and Arjen Van Klink
This article proposes an analytical model for a conversion from Heavy Fuel Oil (HFO) to Liquide Natural Gas(LNG) dual-fuel engine in a fleet with three sizes of vessels in order to investigate the impact of the volatility of oil prices, and a declining E...
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Alexandre Poisson and Charles A. S. Hall
Modern economies are dependent on fossil energy, yet as conventional resources are depleted, an increasing fraction of that energy is coming from unconventional resources such as tar sands. These resources usually require more energy for extraction and u...
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Mads V. Markussen and Hanne Østergård
Modern food production depends on limited natural resources for providing energy and fertilisers. We assess the fossil fuel dependency for the Danish food production system by means of Food Energy Returned on fossil Energy Invested (Food-EROI) and by the...
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Ioannis N. Kessides and David C. Wade
The two most frequently quantified metrics of net energy analysis?the energy return on (energy) investment and the energy payback period?do not capture the growth rate potential of an energy supply infrastructure. This is because the analysis underlying ...
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Philip F. Henshaw, Carey King and Jay Zarnikau
A more objective method for measuring the energy needs of businesses, System Energy Assessment (SEA), measures the combined impacts of material supply chains and service supply chains, to assess businesses as whole self-managing net-energy systems. The m...
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Charles A.S. Hall
This paper is a synthesis of a series of twenty papers on the topic of EROI, or energy return on investment. EROI is simply the energy gained from an energy-obtaining effort divided by the energy used to get that energy. For example, one barrel of oil in...
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Charles A.S. Hall, Bruce E. Dale and David Pimentel
The authors of this paper have been involved in contentious discussion of the EROI of biomass-based ethanol. This contention has undermined, in the minds of some, the utility of EROI for assessing fuels. This paper seeks to understand the reasons for the...
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Roberto Cesare Callarotti
We model the low frequency electrical heating of submarine methane hydrate deposits located at depths between 1000 and 1500 m, and determine the energy return on energy invested (EROI) for this process. By means of the enthalpy method, we calculate the t...
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Jon Freise
Canada was the world?s third largest natural gas producer in 2008, with 98% of its gas being produced by conventional, tight gas, and coal bed methane wells in Western Canada. Natural gas production in Western Canada peaked in 2001 and remained nearly fl...
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Jack P. Manno
Declining energy return on investment (EROI) of a society?s available energy sources can lead to both crisis and opportunity for positive social change. The implications of declining EROI for human wellbeing are complex and open to interpretation. There ...
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Abbe Hamilton, Stephen B. Balogh, Adrienna Maxwell and Charles A. S. Hall
We examine technological progress in the US and Canada to answer the question: has the efficiency (e.g., the edible energy efficiency, or EEE) for producing agricultural products in the US and Canada increased in recent decades? Specifically, we determin...
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Leena Grandell, Charles A.S. Hall and Mikael Höök
Norwegian oil and gas fields are relatively new and of high quality, which has led, during recent decades, to very high profitability both financially and in terms of energy production. One useful measure for profitability is Energy Return on Investment,...
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Bryan Sell, David Murphy and Charles A.S. Hall
The energy cost of drilling a natural gas well has never been publicly addressed in terms of the actual fuels and energy required to generate the physical materials consumed in construction. Part of the reason for this is that drilling practices are typi...
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Michael Dale, Susan Krumdieck and Pat Bodger
Most estimates of energy-return-on-investment (EROI) are ?static?. They determine the amount of energy produced by a particular energy technology at a particular location at a particular time. Some ?dynamic? estimates are also made that track the changes...
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