Thermoeconomic modeling and analysis of sCO2 Brayton cycles

Technische Universität Berlin, Germany
Penkuhn, Mathias;
Technische Universität Berlin, Germany
Tsatsaronis, Georgios
Supercritical CO2 (sCO2) power cycles provide the possibil-ity to significantly improve power generation from fossil fuels and renewable sources considering thermodynamic eÿciency, economics, and flexibility. In the recent years, the increased atten-tion for this technology led to numerous e˙orts to improve cycle eÿciency considering several potential applications. Nevertheless, more complex cycle designs which provide the opportunity to increase the cycle eÿciency have to be economically justified. However, due to the current state of research and development, and the prospective commercialization in the future, no final con-clusions in terms of cycle design can be made because reliable economic data are not available. The scope of the present study is the analysis and comparison of several generic sCO2 Brayton cycle designs for power genera-tion in terms of their economic feasibility. Due to the large number of highly uncertain or nonexistent economic parameters in case of sCO2 Brayton cycles, an approach is used that reformulates the economic problem by introducing dimensionless numbers and ex-ploiting thermoeconomic similitude. It provides a first possibility to analyze the economic impact of employing di˙erent cycle im-provement options like reheating, recompression, and intercooling using the simple recuperated cycle design as a reference. Finally, the possibility to further generalize the findings is discussed.
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