Triple-objective optimization of He Brayton cycles for ultra-high-temperature solar power tower

Li, Qing; E, Erqi; Qiu, Yu

doi:10.1016/j.enconman.2022.116210

Cited by 14 publications

(3 citation statements)

References 49 publications

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“…Another benefit stems from using a stable receiver that remains stationary, like in the PTC. Having this advantage, system complexity decreases, and thus minimises the risk of working fluid leakage [167].…”

Section: Linear Fresnel Reflector (Lfr)mentioning

confidence: 99%

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Reactor and Plant Designs for the Solar Photosynthesis of Fuels

Degerli,

Gramegna,

Tommasi

et al. 2024

Energies

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Solar-boosted photo-technology stands out as a powerful strategy for photosynthesis and photocatalytic processes due to its minimal energy requirements, cost-effectiveness and operation under milder, environmentally friendly conditions compared to conventional thermocatalytic options. The design and development of photocatalysts have received a great deal of attention, whereas photoreactor development must be studied deeper to enable the design of efficient devices for practical exploitation. Furthermore, scale-up issues are important for this application, since light distribution through the photoreactor is a concurrent factor. This review represents a comprehensive study on the development of photoreactors to be used mainly for the photoreduction of CO2 to fuels, but with concepts easily transferable to other photosynthetic applications such as ammonia synthesis and water splitting, or wastewater treatment, photovoltaics combined to photoreactors, etc. The primary categories of photoreactors are thoroughly examined. It is also explained which parameters influence the design of a photoreactor and next-generation high-pressure photoreactors are also discussed. Last but not least, current technologies for solar concentrators are recalled, considering their possible integration within the photoreactor. While many reviews deal with photocatalytic materials, in the authors’ view, photoreactors with significant scale and their merged devices with solar concentrators are still unexploited solutions. These are the key to boost the efficiency of these processes towards commercial viability; thus, the aim of this review is to summarise the main findings on solar photoreactors for the photoreduction of CO2 and for related applications.

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Section: Linear Fresnel Reflector (Lfr)mentioning

confidence: 99%

“…A solar tower, also known as a central system, is a type of concentrating technology that is primarily used in high-temperature power generating applications [167]. Typically, it is used in systems with relatively high-power capacity, where it is necessary to have a significant land extension available.…”

Section: Solar Towersmentioning

confidence: 99%

Reactor and Plant Designs for the Solar Photosynthesis of Fuels

Degerli,

Gramegna,

Tommasi

et al. 2024

Energies

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“…This cycle yields a maximum cycle temperature of around 550 • C and a thermal efficiency of no more than 44% [18]. To increase the economic competitiveness of these plants, it is essential to increase their thermal efficiency by elevating their maximum cycle temperature [19] and developing a more advanced power cycle [20]. Recent studies have shown that nextgeneration SPT plants could achieve maximum cycle temperatures exceeding 700 • C [18,21].…”

Section: Introductionmentioning

confidence: 99%

Triple-Objective Optimization of SCO2 Brayton Cycles for Next-Generation Solar Power Tower

Qiu

2023

Energies

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In this paper, the SCO2 Brayton regenerative and recompression cycles are studied and optimized for a next-generation solar power tower under a maximum cycle temperature of over 700 °C. First, a steady-state thermodynamic model is developed and validated, and the impacts of different operating parameters on three critical performance indexes, including the cycle thermal efficiency, specific work, and heat storage temperature difference, are analyzed. The results reveal that these performance indexes are influenced by the operating pressures, the SCO2 split ratio, and the effectiveness of the regenerators in complex ways. Subsequently, considering the three performance indexes as the optimization objectives, a triple-objective optimization is carried out to determine the optimal operating variables with the aim of obtaining Pareto solutions for both cycles. The optimization indicates that the regenerative cycle can achieve the maximum heat storage temperature difference and the maximum specific work of 396.4 °C and 180.6 kW·kg−1, respectively, while the recompression cycle can reach the maximum thermal efficiency of 55.95%. Moreover, the optimized maximum and minimum pressure values of both cycles are found to be around 30 MPa and 8.2 MPa, respectively. Additionally, the distributions of the optimized values of the regenerator effectiveness and the SCO2 split ratio show different influences on the performance of the cycles. Therefore, different cycles with different optimized variables should be considered to achieve specific cycle performance. When considering thermal efficiency as the most important performance index, the recompression cycle should be adopted. Meanwhile, its SCO2 split ratio and the regenerator effectiveness should be close to 0.7 and 0.95, respectively. When considering heat storage temperature difference or specific work as the most important performance index, the regenerative cycle should be adopted. Meanwhile, its regenerator effectiveness should be close to 0.75. The results from this study will be helpful for the optimization of superior SCO2 cycles for next-generation solar tower plants.

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Design and evaluation of a lab-scale tungsten receiver for ultra-high-temperature solar energy harvesting

Wang

Zhang

et al. 2022

Applied Energy

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Triple-objective optimization of He Brayton cycles for ultra-high-temperature solar power tower

Cited by 14 publications

References 49 publications

Reactor and Plant Designs for the Solar Photosynthesis of Fuels

Reactor and Plant Designs for the Solar Photosynthesis of Fuels

Triple-Objective Optimization of SCO2 Brayton Cycles for Next-Generation Solar Power Tower

Design and evaluation of a lab-scale tungsten receiver for ultra-high-temperature solar energy harvesting

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