P. Mohammadi, A.m. Nikbakht, M. Tabatabaei, Kh. Farhadi,
Volume 2, Issue 3 (7-2012)
Abstract
Global air pollution is a serious threat caused by excessive use of fossil fuels for transportation. Despite the
fact that diesel fuel is a big environmental pollutant as it contains different hydrocarbons, sulphur and crude
oil residues, it is yet regarded as a highly critical fuel due to its wide applications. Nowadays, biodiesel as a
renewable additive is blended with diesel fuel to achieve numerous advantages such as lowering CO2, and
CO emissions as well as higher lubricity. However, a few key drawbacks including higher production cost,
deteriorated performance and likelihood to increase nitrogen oxide emissions have also been attributed to
the application of diesel-biodiesel blends. Expanded polystyrene (EPS), known as a polymer for packaging
and insulation, is an ideal material for energy recovery as it holds high energy value (1 kg of EPS is
equivalent to 1.3 liters of liquid fuel). In this study, biodiesel was applied as a solvent of expanded
polystyrene (EPS) during a special chemical and physical treatment. Various percentages of EPS in
biodiesel blended diesel were tested to evaluate the fuel properties, emissions and performance of CI
engine. The results of the variance analysis revealed that the addition of the additive improved diesel fuel
properties by increasing the flash point as well as the reduction of density and viscosity. Despite a 3.6%
reduction in brake power, a significant decrease in brake specific fuel consumption (7.26%) and an increase
in brake thermal efficiency (7.83%) were observed at the full load and maximum speed of the engine.
Additionally, considerable reductions of CO, CO2, NOx and smoke were achieved.
M. Esfahanian, A. Mahmoodian, M. Amiri, M. Masih Tehrani, H. Nehzati, M. Hejabi, A. Manteghi,
Volume 3, Issue 4 (12-2013)
Abstract
In the present study, a model of a large Lithium Polymer (Li-Po) battery for use in the simulation of Hybrid
Electric Vehicles (HEVs) is developed. To attain this goal, an Equivalent Circuit (EC) consisting of a series
resistor and two RC parallel networks is considered. The accuracy and the response time of the model for
use in an HEV simulator are studied. The battery parameters identification and model validation tests are
performed in low current with a good accuracy. Similar test process is implemented in high current for
another cell and the simulation is verified with experimental results. The validation tests confirm the
accuracy of the model for use in HEV simulator. Finally, the battery model is used to model a Vehicle, Fuel
and Environment Research Institute (VFERI) hybrid electric city bus using ADVISOR software and its
compatibility with other components of the vehicle simulator are demonstrated in a drive cycle test.
