To contribute significantly to the ethanol fuel requirements for transportation, energy balance would need to have a net rate of return or positive energy. To assess the net energy of ethanol must be considered the amount of energy contained in the final product (ethanol) compared to the amount of energy consumed to make ethanol (such as the diesel used in tractors). You have to compare the quality of ethanol compared to gasoline refined, and the energy consumed indirectly (for example, to process the ethanol plant). Although it is an issue that creates debate, some research suggests that the process to create a unit of energy through ethanol takes much less energy from fossil fuels (diesel, natural gas and coal). Ie the energy necessary to move the tractors, to produce fertilizer, to process the ethanol, and the energy associated with the wear on all equipment used in the process cooking gas (known in economics as amortization of assets) may be greater than the energy derived ethanol burned. Two defects are often cited as a response to this argument:
(1) is not the case as the energy, whose economic effects are important. The main economic effects of the comparison are the costs of cleaning up contamination of soil, which come from gasoline spills to the environment, and medical costs of air pollution resulting from the refining of gasoline and burned.
(2) the inclusion of the cost of developing the complex manufacturing of electricity ESCO ethanol instilled a bias against the product, based on the existence of plants refining gasoline.
The final decision will be natural gas based on economic and social reasons for the long term. The first argument, however, remains under discussion. It makes no sense to get 1 liter of ethanol if it is required heating to burn 2 liters of gasoline (or ethanol).
Most of the current scientific discussion to assess both the energy balance of ethanol and other energy sources which focuses on establishing the limits of green energy computation is, how complete and should be a comprehensive outline of energy expenditure energy and income derived from the manufacture of ethanol. We discuss, for example, whether to include such topics as the power required to feed the people who gas care and processed corn, or to raise and repair the fences of the farm, including the amount of energy gas consumed by a tractor. In addition, there is no agreement on what kind of value to the rest of the corn (as for example the stem), commonly known as co. Some advocate that education is best left in the field to protect the soil from erosion and add organic matter. green energy is the way forward, get hold of in their top service and supply of electricity While others burned to power plant co-product of ethanol, but not prevent soil erosion that results (which require more energy in the form of fertilizer). Depending on the study, the net energy varies from 0.7 to 1.5 units of ethanol per unit of fossil fuel energy consumed.
In comparison, if the fossil fuels used to extract ethanol was used to extract oil and gas, were obtained 15 energy units of gasoline, an order household of magnitude greater. But the removal is not the same as the production of each liter of oil extracted is a liter of petrol sold out. To compare the energy balance of the production of gasoline for the production of ethanol, also calculated the energy required to produce oil from the atmosphere and put it back into the earth, a process that would bring the efficiency of production Gasoline was fractional compared to that of ethanol. It is estimated that an energy balance of 200 , (2 energy costs units of ethanol per unit of fossil fuel inverted), before the mass production of ethanol will become economically feasible.