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

Sustainability

Mehdi Aliehyaei⁴  Farideh Atabi¹  Mohammad Khorshidvand²  Marc A. Rosen³ 

[1] Science and Research Branch, Islamic Azad University, Tehran, Iran; E-Mail:;Dezful Branch, Islamic Azad University, 113 Dezful City, Iran; E-Mail:;Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, 2000 Simcoe Street North, Oshawa, ON L1H 7K4, Canada; E-Mail:;Department of Mechanical Engineering, Islamic Azad University, Pardis Branch, Pardis New City, Iran

关键词: exergy;    external;    cost;    internal;    combustion;    engine;   

DOI  :  10.3390/su7044411

来源: mdpi

【 摘 要 】

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 NO_x, 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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.