Research Papers

Analysis of Advanced Supercritical Carbon Dioxide Power Cycles With a Bottoming Cycle for Concentrating Solar Power Applications

[+] Author and Article Information
Saeb M. Besarati

e-mail: sbesarati@mail.usf.edu

D. Yogi Goswami

e-mail: goswami@usf.edu
Clean Energy Research Center,
University of South Florida,
4202 E. Fowler Avenue, ENB 118,
Tampa, FL 33620

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received June 17, 2013; final manuscript received August 30, 2013; published online November 19, 2013. Assoc. Editor: Aldo Steinfeld.

J. Sol. Energy Eng 136(1), 010904 (Nov 19, 2013) (7 pages) Paper No: SOL-13-1172; doi: 10.1115/1.4025700 History: Received June 17, 2013; Revised August 30, 2013

A number of studies have been performed to assess the potential of using supercritical carbon dioxide (S-CO2) in closed-loop Brayton cycles for power generation. Different configurations have been examined among which recompression and partial cooling configurations have been found very promising, especially for concentrating solar power (CSP) applications. It has been demonstrated that the S-CO2 Brayton cycle using these configurations is capable of achieving more than 50% efficiency at operating conditions that could be achieved in central receiver tower type CSP systems. Although this efficiency is high, it might be further improved by considering an appropriate bottoming cycle utilizing waste heat from the top S-CO2 Brayton cycle. The organic Rankine cycle (ORC) is one alternative proposed for this purpose; however, its performance is substantially affected by the selection of the working fluid. In this paper, a simple S-CO2 Brayton cycle, a recompression S-CO2 Brayton cycle, and a partial cooling S-CO2 Brayton cycle are first simulated and compared with the available data in the literature. Then, an ORC is added to each configuration for utilizing the waste heat. Different working fluids are examined for the bottoming cycles and the operating conditions are optimized. The combined cycle efficiencies and turbine expansion ratios are compared to find the appropriate working fluids for each configuration. It is also shown that combined recompression-ORC cycle achieves higher efficiency compared with other configurations.

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Fig. 1

Simple S-CO2 Brayton cycle

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Fig. 2

Recompression S-CO2 Brayton cycle

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Fig. 3

Partial cooling S-CO2 Brayton cycle

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Fig. 4

Validating the model by comparing with the data from Turchi et al. [11]

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Fig. 5

High temperature limit of the ORC cycle [21]

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Fig. 6

Combined simple S-CO2–ORC cycle. The ORC cycle is shown with dashed lines.

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Fig. 7

Performance evaluation of the combined simple S-CO2-ORC cycle using different organic fluids

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Fig. 8

Combined recompression S-CO2-ORC cycle

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Fig. 9

Performance evaluation of the combined recompression S-CO2-ORC cycle using different organic fluids

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Fig. 10

Combined partial cooling S-CO2-ORC cycle

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Fig. 11

Performance evaluation of the combined partial cooling S-CO2-ORC cycle using different organic fluids

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Fig. 12

Performance comparison of the combined and the single cycles at different turbine inlet temperatures



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