Comparative Exergy Analysis of Fuel Additives Containing Oxygen and HC based in a Spark-Ignition (SI) engine

Abstract

The effects of oxygenated fuel additives have been investigated based on the second law (exergy analysis) of thermodynamic in an SI engine. Exergy terms such as the total cylinder exergy, exergy transfers via heat transfer and work, fuel chemical exergy and irreversibility were computed for closed part of the engine cycle. Additionally, the exergy distributions, the brake power, brake specific fuel consumption (BSFC), first (energy) and second law (exergy) efficiencies were determined. The experimental data, especially the measured cylinder pressure data, were used to calculate the exergy terms with a homemade code. Test results showed that when compared with gasoline operation, the peak cylinder pressure for M10, E10, and S10 was increased by 18.65%, 12.75% and 15.52%, respectively, and also shifted towards to TDC. In addition, the energy and exergy efficiency decreased with the addition of methanol, ethanol, and solketal. The maximum reduction in the exergy efficiency occurred for the S10, and this reduction was determined as about an 8.42%. The results also revealed that the gasoline blends containing 10% methanol, ethanol, and solketal were an unfavorable choice from the secondlaw perspective, due to the reduction in the exergy.

Extension of Biodiesel Aging Mechanism–the Role and Influence of Methyl Oleate and the Contribution of Alcohols Through the Use of Solketal

“…In principle, the acidic aqueous environment supports the hydrolysis of the ketal group more intensively (see Scheme 4). [56] Generally, the equilibrium is shifted to the reactant side during this process as acetone vapor pressure is high under room conditions [57] . Furthermore, the synthesis of solketal is an exothermic reaction, [58] which means that the high temperatures favor hydrolysis.…”

“…[56] Generally, the equilibrium is shifted to the reactant side during this process as acetone vapor pressure is high under room conditions. [57] Furthermore, the synthesis of solketal is an exothermic reaction, [58] which means that the high temperatures favor hydrolysis. However, the vapor pressure of solketal is low, indicating not being vaporized.…”

Experimental assessment of a CI engine operating with 1-pentanol/diesel fuel blends

“…The values of BTE, BSFC, and BSEC for all tested fuels were calculated from Eqs. (1-3) by using the data obtained from the engine tests conducted in experimental studies [58,59].…”

Energy, exergy, sustainability and economic analysis of waste tire pyrolysis oil blends with different nanoparticle additives in spark ignition engine

“…Mechanical efficiency reduced by 3-5% when engine operated with 100% ethanol, 10-16% decreased when blend consists of 25% ethanol, 5-9% decreased when blend consists of 40% ethanol as compared to when engine fuelled with 100% petrol. Ozcan and Cakmak [29] studied the effects of the blend of petrol with oxygenated fuel additive involving 10% methanol, 10% ethanol, and 10% solketal on the exergy parameters in a spark-ignition engine. As compared to petrol, exergy efficiencies decreased, and the maximum pressures of the cylinder increased when the engine fired with an oxygenated fuel additive.…”