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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
EXERGY AND EXERGOENVIRONMENTAL ANALYSES OF A SPARK-IGNITION GASOLINE ENGINE
Submission Author:
monica carvalho , PB
Co-Authors:
Daniel R. s. Da Silva, Eduardo José Cidade Cavalcanti, monica carvalho
Presenter: monica carvalho
doi://10.26678/ABCM.ENCIT2020.CIT20-0131
Abstract
The growth in the number of vehicles circulating has led to a greater demand for fossil fuels and consequently, a proportional increase in the emissions of polluting gases. This work presents exergy and exergoenvironmental analyses of a flex-fueled four-stroke spark ignition engine, powered with gasoline-ethanol mixtures (25%, 50%, 75% ethanol by volume). The analyses are developed with experimental results obtained from the engine operated at wide-open throttle conditions, and fixed engine speed (2000 rpm). A Life Cycle Assessment is carried out to quantify the environmental impacts associated with equipment and fuel, employing the Eco-indicator 99 method. The environmental impacts of gasoline and ethanol are 264mPt/kg and 214 mPt/kg, respectively. Pollutants emitted during combustion are measured and included in the environmental assessment (nitrogen oxides, carbon monoxide and dioxide). The fuel blend with 75% ethanol presented the highest exergy efficiency. The effects of the environmental impact rate of pollutant formation and exergy efficiency were significantly higher than the environmental impact rate of fuel. The lowest specific environmental impact of product (shaft power) is 34.48 mPt/MJ, obtained with the fuel blend with 75% ethanol. The combined evaluation of the exergoenvironmental factor and relative difference of environmental impact indicated the optimization priorities and where improvements should be directed.
Keywords
Exergoenvironmental Analysis, SPECO, Life Cycle Assessment, spark ignition engine, gasoline-ethanol blend
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