The Differential Impact of Various Injection Pressures on the Exergy of a Diesel Engine Using Biodiesel-Diesel Fuel Blends

Mostafa Kiani Deh Kiani, Sajad Rostami, Gholamhassan Najafi and Mohamed Mazlan
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Mostafa Kiani Deh Kiani: Biosystem Engineering Department, Shahid Chamran University of Ahvaz, Ahvaz 61357, Iran
Sajad Rostami: Biosystem Engineering Department, Shahrekord University, Shahrekord 34141, Iran
Gholamhassan Najafi: Mechanics of Biosystem Engineering, Tarbiat Modares University, Tehran 14115, Iran
Mohamed Mazlan: Faculty of Bio Engineering and Technology, Universiti Malaysia Kelantan, Jeli 17600, Malaysia

Sustainability, 2021, vol. 14, issue 1, 1-11

Abstract: Contrary to energy, exergy may be destroyed due to irreversibility. Exergy analysis can be used to reveal the location, and amount of energy losses of engines. Despite the importance of the exergy analysis, there is a lack of information in this area, especially when the engine is fueled with biodiesel–diesel fuel blends under various injection operating parameters. Thus, in this research, the exergy analysis of a direct-injection diesel engine using biodiesel–diesel fuel blends was performed. The fuel blends (B0, B20, B40, and B100) were injected into cylinders at pressures of 200 and 215 bars. Moreover, the simulation of exergy and energy analyses was done by homemade code. The simulation model was verified by compression of experimental and simulation in-cylinder pressure data. The results showed there was good agreement between simulation data and experimental ones. Results indicated that the highest level of in-cylinder pressure at injection pressure of 215 bars is more than that of 200 bars. Moreover, by increasing the percentage of biodiesel, the heat transfer exergy, irreversibility, burnt fuel, and exergy indicator decreased, but the ratio of these exergy parameters (except for heat transfer exergy) to fuel exergy increased. These ratios increased from 46 to 50.54% for work transfer exergy, 16.57 to 17.97% for irreversibility, and decreased from 16 to 15.49% for heat transfer exergy. In addition, these ratios at 215 bars are higher than at 200 bars for all fuels. However, with increasing the injection pressure and biodiesel concentration in fuel blends, the exergy and energy efficiencies increased.

Keywords: exergy analysis; biodiesel-diesel blend; injection pressure; lows of thermodynamics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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