This paper presents the modeling approach of a multipurpose simulation tool called gas turbine Arekret-cycle simulation (GT-ACYSS); which can be utilized for the simulation of steady-state and pseudo transient performance of closed-cycle gas turbine plants. The tool analyzes the design point performance as a function of component design and performance map characteristics predicted based on multifluid map scaling technique. The off-design point is analyzed as a function of design point performance, plant control settings, and a wide array of other off-design conditions. GT-ACYSS can be a useful educational tool since it allows the student to monitor gas path properties throughout the cycle without laborious calculations. It allows the user to have flexibility in the selection of four different working fluids, and the ability to simulate various single-shaft closed-cycle configurations, as well as the ability to carry out preliminary component sizing of the plant. The modeling approach described in this paper has been verified with case studies and the trends shown appeared to be reasonable when compared with reference data in the open literature, hence, can be utilized to perform independent analyses of any referenced single-shaft closed-cycle gas turbine plants. The results of case studies presented herein demonstrated that the multifluid scaling method of components and the algorithm of the steady-state analysis were in good agreement for predicting cycle performance parameters (such as efficiency and output power) with mean deviations from referenced plant data ranging between 0.1% and 1% over wide array of operations.

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