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Simple recuperated S-CO2 cycle revisited: Optimization of operating parameters for maximum cycle efficiency

Dutta, A and Gupta, A and Sathish, S and Bandooni, A and Kumar, P (2019) Simple recuperated S-CO2 cycle revisited: Optimization of operating parameters for maximum cycle efficiency. In: ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition, GT 2019, 17 - 21 June 2019, Phoenix.

Full text not available from this repository.
Official URL: https://doi.org/10.1115/GT2019-90315


The paper presents modeling and Design of Experiments (DOE) analysis for a simple recuperated s-CO2 closed loop Brayton cycle operating at a maximum temperature of 600℃ and a compressor inlet temperature of 45℃. The analysis highlights the impact of isentropic efficiencies of the turbine and compressor, decoupled in this case, on other equipment such as recuperator, gas cooler and heater, all of which have a bearing on the overall performance of the s-CO2 Brayton cycle. A MATLAB program coupled with REFPROP is used to perform the thermodynamic analysis of the cycle. A design space exploration with a Design of Experiments (DOE) study is undertaken using I-sightTM (multi-objective optimization software), which is coupled with the MATLAB code. The outcome of the DOE study provides the optimal pressure ratios and high side pressures for maximum cycle efficiency in the design space. By varying pressure ratios along with a floating high side pressure, the analysis reveals that the cycle performance exhibits a peak around a pressure ratio of 2.5, with cycle efficiency being the objective function. A further interesting outcome of the DOE study reveals that the isentropic efficiencies of the compressor and turbine have a strong influence not only on the overall cycle efficiency, but also the optimum pressure ratio as well as the threshold pressures (low as well as high side pressure). An important outcome of this exercise shows that the isentropic efficiency of the turbine has a much greater impact on the overall cycle performance as compared to that of the compressor.

Item Type: Conference Paper
Publication: Proceedings of the ASME Turbo Expo
Publisher: American Society of Mechanical Engineers (ASME)
Additional Information: The copyright for this article belongs to American Society of Mechanical Engineers (ASME).
Keywords: Brayton cycle; Carbon dioxide; Compressors; Design of experiments; Multiobjective optimization; Petroleum prospecting; Thermoanalysis; Turbomachinery; Wind power, Cycle performance; Design space exploration; Isentropic efficiency; Maximum temperature; Objective functions; Operating parameters; Thermo dynamic analysis; Threshold pressures, MATLAB
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 05 Dec 2022 06:56
Last Modified: 05 Dec 2022 06:56
URI: https://eprints.iisc.ac.in/id/eprint/78237

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