Quantitative analytical tools based on the second law of thermodynamics provide insight into the complex optimization tradeoffs encountered in the design of a combined cycle. These tools are especially valuable when considering approaches beyond the existing body of experience, whether in cycle configuration or in gas turbine cooling technology. A framework for such analysis was provided by the author [1-3] using simplified, constant-property models. In this paper, this theme is developed to include actual chemical and thermodynamic properties as well as relevant practical design details reflecting current engineering practice. The second-law model is applied to calculate and provide a detailed breakdown of the sources of inefficiency of a combined cycle. Stage-by-stage turbine cooling flow and loss analysis calculations are performed using the GASCAN program and examples of the resulting loss breakdowns presented. It is shown that the dominant interaction governing the variation of cycle efficiency with turbine inlet temperature is that between combustion irreversibility and turbine cooling losses. Compressor and pressure-drop losses are shown to be relatively small. A detailed analysis and loss breakdown of the steam bottoming cycle is presented in Part 2 of this paper.
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April 1987
Research Papers
Exergy Analysis of Combined Cycles: Part 1—Air-Cooled Brayton-Cycle Gas Turbines
M. A. El-Masri
M. A. El-Masri
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
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M. A. El-Masri
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139
J. Eng. Gas Turbines Power. Apr 1987, 109(2): 228-236 (9 pages)
Published Online: April 1, 1987
Article history
Received:
July 31, 1986
Online:
October 15, 2009
Citation
El-Masri, M. A. (April 1, 1987). "Exergy Analysis of Combined Cycles: Part 1—Air-Cooled Brayton-Cycle Gas Turbines." ASME. J. Eng. Gas Turbines Power. April 1987; 109(2): 228–236. https://doi.org/10.1115/1.3240029
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