ENERGY AND EXERGY BASED ANALYSIS OF SI ENGINES USING METHANE, METHANOL AND OCTANE
In this study, the phenomena of air-fuel mixing and combustion of Methane, Methanol and octane has
been studied numerically in order to assess the thermodynamic analysis of the system. For this purpose, a
thermodynamic-based engine cycle model is developed without considering geometric features of fluid motion.
Here a single cylinder four-stroke spark-ignition (SI) engine is considered as a system. Variable specific heat
ratio is considered instead of constant specific heat ratio. Empirical correlations are used to predict heat loss
from the engine cylinder. Developed fundamental equations and empirical relations have been used in this
model with the help of FORTRAN 95. In this study, friction losses are also modeled to estimate the overall
energy losses calculation. The effects of changing some design and operating parameters such as compression
ratios and rpm on the variation and destruction of exergy have been investigated through the analysis. It was
found that the design and operating conditions have considerable effects on the variation of energy, exergy and
irreversibilities as well as the efficiency during investigated parts of the SI engine cycle. 1st law and 2nd law
efficiencies were found to increase for all the (three) fuels with increasing engine speed and compression ratios.
The Present study recommends the necessity of both energy and exergy analysis to identify the source of work
potential losses for different fuels used in SI engine.
Engineering Thermodynamics. John Wiley & Sons, New York.
 Wark, Jr., K., 1995. Advanced Thermodynamics For
 Ferguson, C. R., and Kirkpatrick, A. T., 2001. Internal
Combustion Engines: Applied Thermosciences. John Wiley & Sons.
 Heywood, J. B., 1988. Internal Combustion Engine
 Stone, R., 1999. Introduction to Internal Combustion
Engines. Macmillan Press Ltd.
 Kotas, T. J., 2012. The Exergy Method of Thermal Plant
Analysis. Exergon Publishing Co.
 Bishop I. N., “Effect of Design Variables on Friction and Economy”, SAE, pp. 334-379, 1964.
 Mizanuzzaman Md., “Effect of bore stroke ratios on
overall friction model of SI engine”, MIST Journal of Science
and Technology, Vol. 1, pp. 71-86, 2012.
 Mizanuzzaman Md., “Advantages of roller follower for
different bore stroke ratios and effects on overall friction of
SI engine”, MIST Journal of Science and Technology, Vol. 2, pp.
 Haq, M. Z., and Morshed, A., “Energy and Exergy
based analyses of a multy-fuelled SI engine”. In: Proceedings
of the ASME 2013 Power Conference, July 29-August 1, 2013,
Boston, Massachusetts, USA, Paper No. Power 2013-98279.
 Rakopoulos, C. D., 1993. “Evaluation of a spark ignition
engine cycle using first and second law analysis techniques”.
Energy Conversion and Management, 34(12), pp. 1299-1314.
 Rakopoulos, C. D. and Giakoumis, E. G., 2006.
“Second law analyses applied to internal combustion engines
operation”. Progress in Energy and Combustion science, Vol. 32,
 Kumar, D., Singh, A., and Sarma, A. K., “Energy
and Exergy Analysis of CI Engine for Karanja Biodiesel”.
 Sezer, I., Altin, I., and Bilgin, A., 2009. “Exergetic
analysis of using oxygenated fuels in spark-ignition (SI)
engines”. Energy & Fuels, 23(4), pp. 1801-1807.
 Sezer, I., Altin, I., and Bilgin, A., 2008. “Exergy analysis
of SI engines”. Int. J. Exergy, Vol. 5, No. 2, pp. 204-217.
 Mizanuzzaman Md., “Energy and exergy based
analysis of SI engines using alternative fuels”, In: Proceedings
of the first international conference on mechanical engineering and
applied science (ICMEAS-2017), 22-23 February, 2017, MIST ,
Though MIJST follows the open access policy, the journal holds the copyright of each published items.
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.