Thermal hybrid power systems using multiple heat sources of different temperature: Thermodynamic analysis for Brayton cycles

Yue, Ting; Lior, Noam

doi:10.1016/j.energy.2018.09.099

Cited by 14 publications

(4 citation statements)

References 31 publications

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“…It is then compressed by the MC and heated by the LTR (5-6-7-9). The remaining sCO 2 enters the RC without cooling (5)(6)(7)(8).…”

Section: System Descriptionmentioning

confidence: 99%

“…5 The dynamic performance and control strategy is an important research subject to ensure safe operation and meet various load demands. 6,7 The research on the dynamic performance of the sCO 2 Brayton cycle focuses on the following aspects: dynamic modeling establishment and dynamic performance under disturbances, 8,9 control strategies for load following, 10,11 start-up and shutdown process, 12,13 as well as failure conditions. 14 For example, Dostal et al 8 modeled the Brayton cycle named MARS and validated its performance against the experimental data of the test bench.…”

Section: Introductionmentioning

confidence: 99%

“…Brayton cycle has many structures and a wide range of applications 5 . The dynamic performance and control strategy is an important research subject to ensure safe operation and meet various load demands 6,7 …”

Section: Introductionmentioning

confidence: 99%

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Dynamic response and emergency measures under failure conditions of sCO₂ Brayton cycle

Wang

Qin

et al. 2022

Energy Science & Engineering

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The sCO 2 Brayton cycle has gained interest because of its flexibility and ability to provide higher thermomechanical conversion efficiency. Studies on failure conditions and corresponding emergency measures are of great significance to ensure the safety of the system, while there are limited studies related to the sCO 2 Brayton cycle because the test circuit has not been applied in practice at present. In this study, we have developed a dynamic model of the CO 2 Brayton cycle, and carefully validated its components against experimental data. Preliminary safety assessment and dynamic response under loss of cooling water (LOCW), loss of heat source (LOHS), and pipeline leakage have been analyzed. Emergency strategies are proposed to maintain the safe operation under failure conditions. The primary objective of this study is to reveal the dynamic performance and emergency measures under failure conditions of the sCO 2 Brayton cycle. The results demonstrate that the system net power decreases at rates close to 10%/s and less than 0.1%/s under LOCW and LOHS, respectively. The system responds more dramatically under LOCW compared with LOHS. The system needs emergency measures under LOCW, while it has sufficient time to realize a normal slow shutdown under LOHS. The leakage rate is at least five times higher in the high-pressure pipeline compared with the low-pressure pipeline for the same area of the leakage hole. Under pipeline leakage, the heat source should be cut-off slowly, and the rotation speeds of the main compressor and recompressor should be reduced simultaneously to protect the system.

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“…It is then compressed by the MC and heated by the LTR (5-6-7-9). The remaining sCO 2 enters the RC without cooling (5)(6)(7)(8).…”

Section: System Descriptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dynamic response and emergency measures under failure conditions of sCO₂ Brayton cycle

Wang

Qin

et al. 2022

Energy Science & Engineering

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“…In addition, the energy and exergy study of a solar plant with helium and an organic lower cycle [50] and the exergy analysis of a hybrid supercritical carbon dioxide central tower solar plant for different locations in Saudi Arabia [51] have also been carried out. Finally, exergy models have been developed for Brayton plants with different heat sources, including fossil fuel burning and using renewable energy sources [52].…”

Section: Hybrid Solar Thermal Plant Exergy Modelmentioning

confidence: 99%

Alternatives to Improve Performance and Operation of a Hybrid Solar Thermal Power Plant Using Hybrid Closed Brayton Cycle

2022

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Hybrid solar thermal power plants using the Brayton cycle are currently of great interest as they have proven to be technically feasible. This study evaluates mechanisms to reduce fuel consumption and increase the power generated, improving plant efficiency. An energy and exergy model for the hybrid solar plant is developed using an estimation model for the solar resource to determine the plant operation under specific environmental conditions. The effect of using different working fluids in the Brayton cycle, such as air, and helium in transcritical conditions and carbon dioxide in subcritical and supercritical conditions, is evaluated. Additionally, the plant's exergy destruction and exergy efficiency are evaluated. In those, it can be highlighted that the helium cycle in the same operating conditions compared to other working fluids can increase the power by 160%, increasing fuel consumption by more than 390%.

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Dynamic study of the extraction ratio and interstage pressure ratio distribution in typical layouts of SCO2 Brayton cycle under temperature fluctuations

Zhang

Klemeš

Zeng

et al. 2022

Applied Thermal Engineering

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Thermal hybrid power systems using multiple heat sources of different temperature: Thermodynamic analysis for Brayton cycles

Cited by 14 publications

References 31 publications

Dynamic response and emergency measures under failure conditions of sCO₂ Brayton cycle

Dynamic response and emergency measures under failure conditions of sCO₂ Brayton cycle

Alternatives to Improve Performance and Operation of a Hybrid Solar Thermal Power Plant Using Hybrid Closed Brayton Cycle

Dynamic study of the extraction ratio and interstage pressure ratio distribution in typical layouts of SCO2 Brayton cycle under temperature fluctuations

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Thermal hybrid power systems using multiple heat sources of different temperature: Thermodynamic analysis for Brayton cycles

Cited by 14 publications

References 31 publications

Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle

Dynamic response and emergency measures under failure conditions of sCO2 Brayton cycle

Alternatives to Improve Performance and Operation of a Hybrid Solar Thermal Power Plant Using Hybrid Closed Brayton Cycle

Dynamic study of the extraction ratio and interstage pressure ratio distribution in typical layouts of SCO2 Brayton cycle under temperature fluctuations

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Product

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Dynamic response and emergency measures under failure conditions of sCO₂ Brayton cycle

Dynamic response and emergency measures under failure conditions of sCO₂ Brayton cycle