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.
Highlights
Diesel engines play a substantial role in the transport and agricultural sector
One alternative fuel that has been widely used in compression ignition (CI) engines is biodiesel [1,2,3,4]
Regarding the strong correlation between the experimental and simulation data, the exergy terms are computed for different biodiesel–diesel blends at two injection pressures (IPs) at 1600 rpm
Summary
Diesel engines play a substantial role in the transport and agricultural sector. The development of technology increases the use of petrol and diesel. Some researchers have analyzed the first law of thermodynamics (thermal balance) at different operating conditions, especially by using biodiesel fuel [5,6,7,8,9]. They have showed that the first low is inadequate to investigate the thermodynamic details of engines. Several researchers performed the exergy and energy analyses in CI engines. Karagoz and his co-worker investigated the energy, exergy, and economics of a diesel engine using tire pyrolytic oildiesel blend.
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