A novel evacuated receiver improved by a spectral-selective glass cover and rabbit-ear mirrors for parabolic trough collector

Qiu, Yu; Xu, Mingpan; Li, Qing; Xu, Yucong; Wang, Jikang

doi:10.1016/j.enconman.2020.113589

Cited by 24 publications

(3 citation statements)

References 56 publications

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“…The primary objective of solar thermal power technology development is to enhance thermal efficiency, elevate specific work, and accomplish large-scale heat storage. Among the available solar thermal power technologies, including the solar power tower (SPT) [7,8], solar dish collector [9,10], linear Fresnel reflector [11,12] and parabolic trough collector [13][14][15], the SPT is a promising option that is expected to meet the above development requirements [16].…”

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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Section: Introductionmentioning

confidence: 99%

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

Qiu

2023

Energies

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“…good spectral selectivity). 6 However, there are two problems with present state-of-the-art commercial Pyromark absorber when the temperature rises to 1300 C. Firstly, the solar absorptivity of this commercial absorber is as high as 0.965 within the solar spectrum, but its spectral emissivity also can be as high as $0.85 within the mid-IR region. 53 Meanwhile, this absorber cannot withstand the high temperature of above 1100 C.…”

Section: Introductionmentioning

confidence: 99%

Near-perfect spectrally-selective metasurface solar absorber based on tungsten octagonal prism array

Guo

Zhang

et al. 2022

RSC Adv.

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“…Solar energy utilization is a promising approach to solve problems such as energy crisis, [1] environmental pollution, [2] and global warming. [3] Solar power generation technologies mainly include photovoltaics, [4] concentrating solar power (CSP), [5,6] thermophotovoltaics, [7] etc.…”

Section: Introductionmentioning

confidence: 99%

A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

Qiu¹,

Xu²,

Li³

et al. 2021

ES Energy Environ.

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Solar selective absorber is a key component that directly influences the photothermal efficiency in high-temperature solar energy harvesting. In present work, a solar selective absorber combining tungsten nanohole and nanoshuriken arrays was proposed and studied. Firstly, the geometry of the absorber was optimized, obtaining a near-perfect absorber. Then, evaluation of the near-perfect absorber indicated that it can achieve near unit spectral absorptance within 0.28-1.25 μm and obtain a solar absorptance of 0.9457, thus achieving a photothermal efficiency of 91.52% at 1273 K under 1000 suns. Then, analysis of its absorbing mechanisms revealed that the high solar absorptance is contributed by the impedance matching, and the coupling effects of the cavity resonance, surface plasmon polaritons, magnetic polaritons, and local surface plasmon resonance. In addition, study on the effects of the geometric parameters indicated that the absorber performance is insensitive to the changes in geometric parameters when the changes are within fabrication uncertainties. Finally, effects of the polarization angle and incident angle were examined, indicating that the near-perfect absorber exhibits high insensitivities to wide-angle incidence and all-angle polarization. These results indicate the near-perfect absorber is promising for high temperature solar energy harvesting.

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A novel evacuated receiver improved by a spectral-selective glass cover and rabbit-ear mirrors for parabolic trough collector

Cited by 24 publications

References 56 publications

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

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

Near-perfect spectrally-selective metasurface solar absorber based on tungsten octagonal prism array

A high-Temperature Near-Perfect Solar Selective Absorber Combining Tungsten Nanohole and Nanoshuriken Arrays

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