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Ethanol Essay

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Ethanol
Ethanol, an alcohol, is the product of the fermentation of a biomass resources or sugar rich crops such as corn. Ethanol is an alternative fuel used over a century till to this very day however it has not been a profound source of fuel. It has not been until the last few decades that ethanol has gone through resurgence from going from a secondary to primary option in fuel consumption. Here in Queensland the revival is boosted due to the availability of an already grown biomass; sugar canes, a product already growing in large quantities throughout Queensland that can be utilised for the mass production of ethanol fuel. Utilizing sugarcanes for the production of ethanol in Queensland would be beneficial to the economy, the …show more content…

Ethanol in Engines
Ethanol at the moment is present as a blended fuel with petrol. As it is blended with petrol, this increases efficiency for the ethanol but decreases the petrol’s very own efficiency. Although ethanol is a better fuel to run through an engine avoid or alleviate knocking and pre ignition. Although the efficiency of petrol may be brought down, by having the ethanol, this increases the overall octane number of petrol thus allowing for a greater compression. So what is the importance of the compression ratio in a car? Recently, cars such the Mazda 3 with the SkyActiv engine can get as far as 17.9 kilometres on one litre of fuel due to the engines high compression ratio. The compression ratio is “the volume of the combustion chamber when the piston is at the bottom, and the volume of the combustion chamber when the piston is at the top” (Deaton, 2011). Ethanol has a compression ratio of 14.5-16.1:1 whereas petrol has a ratio of 10:1 or lower as a higher compression could potentially lead to knocking in petrol engines. By having the ethanol blend with petrol, this then allows for increased fuel efficiency for ethanol but decreased efficiency for petrol.
The energy that comes from the combustion from either ethanol or petrol comes from burning these hydrocarbons in order for the oxygen from the air to combine and combust (See Ethanol and the Environment for more). Energy is produced when the hydrocarbon bonds between the carbon and the hydrogen and

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