Analysis of design, off-design and annual performance of supercritical CO2 cycles for csp applications

Dhinesh Thanganadar, Francesco Fornarelli, Sergio Camporeale, Faisal Asfand, Kumar Patchigolla

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Supercritical carbon dioxide (sCO2) cycles are studied as the next-generation power cycles in order to reduce the cost of Concentrating Solar Power (CSP) plants. The design performance of numerous cycles has been investigated, nevertheless, the off-design and annual performance of these cycles are seldom studied. This plays a critical role in selecting an optimal cycle for CSP application, as an efficient power cycle influences the solar field size, consequently affecting the Levelised cost of electricity (LCOE). In this study, the design, off-design and annual performance of three sCO2 cycles; simple recuperative, recompression and partial-cooling cycles are studied. Multi-objective optimisation was performed and the off-design Pareto fronts were compared for the changes in the power cycle boundary conditions. Annual performance simulation was carried out, and the performance of the three cycles was compared when the power cycle is operated in maximum efficiency mode, which facilitates selecting the optimal cycle. The LCOE of the simple recuperated cycle was higher by roughly 1.7¢/kWh than recompression cycle when maximising the power cycle efficiency and the partial cooling cycle is higher by 0.2¢/kWh. However, operating the power cycle in the maximum efficiency mode significantly lowers the plant capacity factor (around 10-20%).

Original languageEnglish
Title of host publicationStructures and Dynamics
Subtitle of host publicationStructural Mechanics, Vibration, and Damping; Supercritical CO2
PublisherAmerican Society of Mechanical Engineers (ASME)
Number of pages9
Volume11
ISBN (Electronic)9780791884232
DOIs
Publication statusPublished - 21 Sep 2020
Externally publishedYes
EventASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition - Virtual, Online
Duration: 21 Sep 202025 Sep 2020

Publication series

NameProceedings of the ASME Turbo Expo
Volume11

Conference

ConferenceASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition
Abbreviated titleGT 2020
CityVirtual, Online
Period21/09/2025/09/20

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