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Exergy analysis for greener gas turbine engine arrangements


Exergy analysis is a method that uses the conservation of mass and conservation of energy principles together with the second law of thermodynamics for the analysis, design, and improvement of energy and other systems. The exergy method is a useful tool for furthering the goal of more efficient energy-resource use, for it enables the locations, types, and magnitudes of wastes and losses to be identified and meaningful efficiencies to be determined. The exergy analysis of two-shaft gas turbine arrangements is presented and discussed in this paper. Two configurations (in parallel and series free turbine) are presented here and analyzed separately to identify and quantify the energy and exergy losses. Comparison between the two configurations is presented in terms of work output, efficiency, SFC, exergy destruction, and second-law efficiency for the design conditions. The percentage ratio of the exergy destruction in the individual components to total exergy destruction was found maximum in the combustion chambers (above 90%). The second-law efficiency of series configuration is found to be higher than parallel.

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Correspondence to Y. S. Najjar.

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Najjar, Y.S., Al-Absi, S. Exergy analysis for greener gas turbine engine arrangements. J. Engin. Thermophys. 22, 247–256 (2013).

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  • Combustion Chamber
  • Pressure Ratio
  • Exergy Analysis
  • Exergy Loss