Exergetic Analysis of an Internal Combustion Engine Running on E22 and E100

Rovai, Fernando Fusco; Mady, C. E.

doi:10.5380/reterm.v21i2.87921

Cited by 3 publications

(8 citation statements)

References 1 publication

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“…Maximum engine efficiencies with recovery potential were about 50% and 46% for the WOT and POT conditions, respectively, at 3000 rpm. These values of the second law efficiency under the WOT operating condition are within the range of the previously recorded data, i.e., 53%, 45.62 and 53.6%, as stated by [26,27,44], respectively. In another work presented by [15], it was reported that the total exergy efficiency could be substantially enhanced by up to 60% based on recuperating both the cooling water and exhaust gas energies.…”

Section: Resultssupporting

confidence: 88%

“…These results were interpreted mainly due to the high fuel consumption rate and the blended fuels' low energy content. An exergtic analysis of an ICE running on twoboundary Brazil flex-fuels, including gasoline blend and hydrous ethanol performed by [26]. Hydrous ethanol produced 4.5% higher energetic efficiency than gasoline blend for the same engine configuration due to superior fuel properties.…”

Section: Introductionmentioning

confidence: 99%

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Throttling effect on the availability and sustainability of a gasoline-fuelled spark ignited multi-cylinder engine

Hamada,

Ibrahim,

Rahim

et al. 2023

Eng. Res. Express

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Large energy waste is one of the internal combustion engine challenges, making it unsustainable and unfriendly to the environment. Charging the spark ignition engine with the required fuel-air mixture is associated with a particular quantity of energy loss due to flow throttling. Throttle position effect on the availability, sustainability, and environmental trends of a gasoline, spark-ignited engine was evaluated based on thermodynamic analyses of real experiments. The availability and sustainability analyses were performed utilizing the relations governing the thermodynamic system under various engine speeds (1500–4000 rpm) at part and wide-open throttle (POT and WOT) conditions. The results indicated that the WOT position mostly ensures the best sharing of useful availability, i.e., 2% greater, more sustainable, i.e., 3% better, and environmentally friendly, i.e., 16% healthier, engine operation for the entire tested speed range. On the other hand, an optimum engine speed, mostly 3000 rpm, of the tested engine yielded the maximum efficiencies, i.e., 3% higher, lowest entropy production, i.e., 15% lower, and best availability proportions, as well as the most sustainable and environmentally friendly operation mode. Furthermore, a considerable perspective of the waste heat recovery of the associated availability with exhaust gases was achieved under POT and WOT conditions. The acquired improvement in engine efficiency based on the recovery potential was in the range of 3% to 19.7% and 13.6% to 24% for the WOT and POT conditions, respectively. However, the detected recovery rate and efficiency improvement were randomly tended with engine speed variation. In terms of the recovery potential, the highest engine efficiencies were about 46% and 50% at 3000 rpm, for the POT and WOT conditions, respectively. Finally, in average around 10% and 52% increment with 20% and 24% reduction was detected for the environmental impact of the CO2, NOx, CO and HC, respectively, under the WOT condition in comparison with POT condition.

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Throttling effect on the availability and sustainability of a gasoline-fuelled spark ignited multi-cylinder engine

Hamada,

Ibrahim,

Rahim

et al. 2023

Eng. Res. Express

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“…In the final part of the representation, there are indications of enthalpy losses to the environment from exhaustion flue gases (ICEV), exergy transfer to the environment associated with heat, and other exergy losses associated with friction, fuel, the batteries, and the tank. The energy and exergy analyses of these processes are based on previous studies by Fusco and Mady [27].…”

Section: Methodsmentioning

confidence: 99%

“…The traction force work is calculated by gathering traction force and integrating it as a function of distance between two interval points. Then, lost work (destroyed exergy) can be calculated by fuel exergy (chemical exergy), exhaust gas exergy (thermal exergy), and exergy related to heat exchanged between the engine and the vehicle's surroundings [27]. Unlike the authors, our system's frontier is considered the environment.…”

Section: Thermodynamicsmentioning

confidence: 99%

“…75 from 2015, [38]. According to [27], the E22 fuel blend, commercially available in Brazil, has a lower heating value of 39.26 MJ/kg and a density of 715 kg/m 3 . In parallel, a mix of E100 hydrous ethanol is also considered (since Brazil has been a leader in the technology and usage of ethanol for the past 30 years, as seen in Ref.…”

Section: Simulation Conditionsmentioning

confidence: 99%

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Energy, Exergy, and Emissions Analyses of Internal Combustion Engines and Battery Electric Vehicles for the Brazilian Energy Mix

Feliciano,

Rovai,

Mady

2023

Energies

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Exergy is a thermodynamic concept that ponders the quality of energy. It evaluates the irreversibilities of a machine, demonstrating its capacity to perform work associated with energy conversion. This article focuses on directing public policies and vehicle development toward their most proper usage worldwide. In the urban mobility scenario, there is an obvious demand to decrease greenhouse gas (GHG) emissions. In addition, the internal combustion engine (ICE) experiences considerable energy losses through heat exchange through the radiator and exhaust flow gases, which are not considerable in battery electric vehicles (BEVs) since there are no exhaust gases subsequent to combustion, nor combustion itself. This work presents longitudinal dynamics simulations of passenger vehicles to understand the magnitude of exergy destruction in ICEVs and BEVs, considering the Brazilian and European Union electric energy mix. Overall, the method can be applied to any other country. The simulation and model parameters were configured to match production road vehicles commercialized in the Brazilian market based on different versions of the same model. Two vehicle dynamic duty cycles were used, one relating to urban usage and another to highway usage, resulting in an overall exergy efficiency of around 50–51% for BEVs considering the exergy destruction in power plants. In contrast, ICE has an average efficiency of 20% in the urban cycle and around 30% in the highway cycle. By comparing the overall equivalent CO2 emissions, it is possible to conclude that EVs in the European energy matrix produce more GHG than ICE vehicles running on ethanol in Brazil. Nevertheless, there are increasing uses of coal, natural gas, and oil thermal electric power plants, raising the question of how the transition may occur with a general increase in electrification since there is an increasing electric expenditure in all sectors of society, and the renewable energy plants may not meet all of the demand.

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