Exergy Analysis of Combined Cycles: Part 1 — Air-Cooled Brayton-Cycle Gas Turbines PUBLIC ACCESS

[+] Author Affiliations
M. A. El-Masri

Massachusetts Institute of Technology

Paper No. 86-JPGC-GT-9, pp. V001T01A009; 10 pages
  • 1986 Joint Power Generation Conference: GT Papers
  • 1986 Joint Power Generation Conference: GT Papers
  • Portland, Oregon, USA, October 19–23, 1986
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7933-7
  • Copyright © 1986 by ASME


Quantitative analytical tools based upon the second law of thermodynamics provide insight into the complex optimization tradeoffs encountered in the design of a combined cycle. Those 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 in references [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.

Copyright © 1986 by ASME
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