Comparative analysis of the performance of a dual-fuel internal combustion engine for CNG and gasoline fuels

  • Mohammad Ameri Power & Water University of Technology, Iran
  • Farzad Kiaahmadi
  • Mansour Khanaki Department of Mechanical Engineering, Imam Khomeini International University


In this paper, comparison of a dual-fuel internal combustion engine performance for CNG and gasoline fuels is evaluated at the steady-state condition by application of energy and exergy analysis using the experimental test results. The energy and exergy balances are calculated at different engine speeds. The results show that the energy and exergy of the heat rejection for gasoline and CNG fuels increases with increasing engine speed and the exergy efficiencies are slightly higher than the corresponding energy efficiencies. Moreover, the results show that the exergy efficiency for gas-fuel is higher than the  gasoline-fuel exergy efficiency at all engine speeds. The results show that due to volumetric efficiency drop, power and torque of the gas-fuel engine is lower than gasoline-fuel one. Furthermore, the specific fuel consumption of the gas-fuel engine is lower than gasoline-fuel one. The results of this study have revealed that the most important source of the system inefficiency is the destruction of exergy by irreversible processes, mostly by the combustion. Moreover, it should be noted that liquid fuels like gasoline have many important advantages like much greater volumetric energy density, ease of transport and storage, which have made them as the preferred fuels for IC engines.

Author Biography

Mohammad Ameri, Power & Water University of Technology, Iran
Mechanical & Energy Eng. Department, Associate Professor


[1] Kotas TJ. The Exergy Method of Thermal Plant Analysis. London: Butterworths; 1985.
[2] Dincer I. The role of exergy in energy policy making. Energy Policy 2002; 30(2): 137–149.
[3] Alasfour FN. Butanol-a single cylinder engine study: Availability analysis. Applied Thermal Engineering 1997; 17(6): 537-549.
[4] Alkidas AC. The application of availability and energy balances to a diesel engine. Journal of Engineering for Gas Turbines and Power 1998; 110(3): 462–469.
[5] Lipkea WH, DeJoode AD. A Comparison of the Performance of Two Direct Injection Diesel Engines from a Second Law Perspective. SAE Paper 1998; No: 890824.
[6] Caton JA. A Review of Investigations using the Second Law of Thermodynamics to Study Internal Combustion Engines. SAE Paper 2000; No: 2000-01-1081.
[7] Rakopoulos CD, Giakoumis EG. Second law analyses applied to internal combustion engines operation. Progress in Energy and Combustion Science 2006; 32:2–47.
[8] Caton JA. On the destruction of availability (exergy) due to combustion processes with specific application to internal combustion engines. Energy 2000; 25: 1097–1117.
[9] Kopac M, Kokturk L. Determination of optimum speed of an internal combustion engine by exergy analysis. Int. J. Exergy 2005; 2(1): 40–54.
[10] Rakopoulos CD, Kyritsis DC. Comparative second law analysis of internal combustion engine operation for methane, methanol, and dodecane fuels. Energy 2001; 26: 705–722.
[11] Sayin C, Hosoz M, Canakci M, Kilicaslan I. Energy and exergy analyses of a gasoline engine. Intl. J. of Energy Research 2007; 31: 259–273.
[12] Nakonieczny, K. Entropy generation in a diesel engine turbocharging system. Energy 2002; 27: 1027–1056.
[13] Rakopoulos CD, Giakoumis EG. Availability analysis of a turbocharged diesel engine operating under transient load conditions. Energy 2004; 29 (8): 1085–1104.
[14] Canakci M, Hosoz M.Energy and Exergy Analyses of a Diesel Engine Fuelled wit Various Biodiesels. Energy Sources 2006; Part B, 1:379–394.
[15] Ameri M, Kiaahmadi F, Khanaki M, Nazoktabar M. Energy and exergy analyses of a spark-ignition engine. Int. J. Exergy 2010;7(5): 547-563.
[16] Pischinger R, Krassnig G, Taucar G, Sams TH. Die Thermodynamik der Verbrennungskraftmaschine . Neue Folge Band 5. Von List H. und Pischinger A.10/1998.
[17] Çengel AY, Boles MA.Thermodynamics, An Engineering Approach. New York: McGraw-Hill; 1998.
[18] Raine RR, Jones GM. Comparison of temperatures measured in natural gas and gasoline fuelled engines. Department of mechanical engineering, University of Auckland. SAE paper 1990; No: 901503.
How to Cite
AMERI, Mohammad; KIAAHMADI, Farzad; KHANAKI, Mansour. Comparative analysis of the performance of a dual-fuel internal combustion engine for CNG and gasoline fuels. Journal of Power Technologies, [S.l.], v. 92, n. 4, p. 214--226, dec. 2012. ISSN 2083-4195. Available at: <>. Date accessed: 05 aug. 2021.
Fossil Fuels


dual-fuel engine, exergy analysis, efficiency, irreversibility, performance

Most read articles by the same author(s)

Obs.: This plugin requires at least one statistics/report plugin to be enabled. If your statistics plugins provide more than one metric then please also select a main metric on the admin's site settings page and/or on the journal manager's settings pages.