This paper presents the methodology developed for the estimation of thermodynamic performance and reports the optimum cycle parameters of coal fired CCGT in regenerative and Combined Cycle Configurations using Air, Helium and Carbon-Dioxide as working gases. A rigorous approach has been followed for the determination of the cycle efficiency by assuming the specific heat of working gases as a continuous function of temperature for accurate estimation of cycle parameters. The performance evaluation of CCGT in combined cycle mode of operation is carried out to optimize the steam bottoming cycle parameters and hence the compressor pressure ratio for achieving the maximum cycle efficiency. From the study it is observed that Helium is the most suitable working gas as it produces high thermal efficiency at a low compressor pressure ratio.

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