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Sustainability 2015, 7(4), 4411-4424;

Exergy, Economic and Environmental Analysis for Simple and Combined Heat and Power IC Engines

Department of Mechanical Engineering, Islamic Azad University, Pardis Branch, Pardis New City, Iran
Science and Research Branch, Islamic Azad University, Tehran, Iran
Dezful Branch, Islamic Azad University, 113 Dezful City, Iran
Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada
Author to whom correspondence should be addressed.
Academic Editor: Francesco Asdrubali
Received: 21 December 2014 / Revised: 8 March 2015 / Accepted: 11 March 2015 / Published: 14 April 2015
(This article belongs to the Section Energy Sustainability)
Full-Text   |   PDF [1468 KB, uploaded 14 April 2015]   |  


This study reports the results of exergy, economic and environmental analyses of simple and combined heat and power internal combustion engines. Values of entropy production, second law efficiency are calculated, and an objective function, including initial, operation, maintenance and fuel costs, as well as the external costs of environmental pollutants, such as CO2, CO and NOx, are presented for the flue gas of the internal combustion engine. The results show that entropy generation in the combined heat and power mode is 30% lower than that in the simple internal combustion engine. Also, by excessively increasing the air ratio, the system entropy generation decreases in both cases of simple and combined heat and power IC engines. The greatest portion of entropy generation is related to the combined heat and power internal combustion engine. The gas heat exchanger generates more entropy than the jacket heat exchanger. Lower values of electricity cost and external costs of air pollution are provided by higher values of molar air to fuel ratio. The environmental aspects depend on location of the system and time of engine operation. View Full-Text
Keywords: exergy; external; cost; internal; combustion; engine exergy; external; cost; internal; combustion; engine

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Aliehyaei, M.; Atabi, F.; Khorshidvand, M.; Rosen, M.A. Exergy, Economic and Environmental Analysis for Simple and Combined Heat and Power IC Engines. Sustainability 2015, 7, 4411-4424.

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