A modified porous solar receiver with a hollow glass tube at the center was developed to decrease the surface temperature of the receiver and improve thermal efficiency and security.The hollow glass tube matches the heat transfer fluid （HTF） and the concentrated solar flux （CSF）,which can increase the velocity of the HTF by suction effect and reduce the CSF by increasing the absorption area. Then, the high-temperature heat transfer characteristics of the single porous receiver （SPR）,modified porous receiver with a center hole （MPR-CH）,and modified porous receiver with a hollow glass tube （MPR-HGT） were investigated and compared.Results show that the maximal velocity of the HTF at the center zone of the SPR,MPR-CH,and MPR-HGT increases from 0.75 m/s to 1.6 m/s and 1.8 m/s, respectively. The peak CSF of the SPR, MPR-CH, and MPR-HGT increases from 0.75 m/s to 1.6m/s and 1.8 m/s,respectively.Accordingly,the peak solid temperature of the SPR,MPR-CH,and MPR-HGT decreases from 1740 K to 1444 K and 1436 K, respectively.The thermal efficiency of the three receivers increases from 59.3%~71.9% to 65.7%~79.9% and 70.4%~81.6% during the mass flow rate of the HTF from 3.0 g/s to 10.0 g/s. This modified porous solar receiver design can be implemented into advanced, high-temperature power cycles.
Key words
solar energy /
solar absorber /
heat flux /
heat transfer performance /
thermal efficiency
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References
[1] AVILA-MARIN A L, FERNANDEZ-RECHE J, MARTINEZ-TARIFA A. Modelling strategies for porous structures as solar receivers in central receiver systems: a review[J]. Renewable and sustainable energy reviews, 2019, 111: 15-33.
[2] HE Y L, DU S, SHEN S.Advances in porous volumetric solar receivers and enhancement of volumetric absorption[J]. Energy reviews, 2023, 2(3): 100035.
[3] CUNSOLO S, COQUARD R, BAILLIS D, et al.Radiative properties of irregular open cell solid foams[J]. International journal of thermal sciences, 2017, 117: 77-89.
[4] WU Z Y, CALIOT C, FLAMANT G, et al.Coupled radiation and flow modeling in ceramic foam volumetric solar air receivers[J]. Solar energy, 2011, 85(9): 2374-2385.
[5] 戴贵龙, 陈雪淇, 庄莹. 玻璃套管双层吸热芯的热辐射特性研究[J]. 太阳能学报, 2022, 43(7): 186-190.
DAI G L, CHEN X Q, ZHUANG Y.Thermal radiation performances of solar volumetric absorbers made up of muliple tubes and porous[J]. Acta energiae solaris sinica, 2022, 43(7): 186-190.
[6] HE Y L, WANG K, QIU Y, et al.Review of the solar flux distribution in concentrated solar power: non-uniform features, challenges, and solutions[J]. Applied thermal engineering, 2019, 149: 448-474.
[7] 戴贵龙, 薛鑫杰, 陈雪淇, 等. 双层吸热芯聚集太阳光吸收分布特性研究[J]. 太阳能学报, 2021, 42(4): 328-333.
DAI G L, XUE X J, CHEN X Q, et al.Absorption distribution performances of double layer absorber for concentrated solar light[J]. Acta energiae solaris sinica, 2021, 42(4): 328-333.
[8] CHEN X, XIA X L, YAN X W, et al.Heat transfer analysis of a volumetric solar receiver with composite porous structure[J]. Energy conversion and management, 2017, 136: 262-269.
[9] SEDIGHI M, PADILLA R V, ALAMDARI P, et al.A novel high-temperature (>700 ℃), volumetric receiver with a packed bed of transparent and absorbing spheres[J]. Applied energy, 2020, 264: 114705.
[10] ZHANG Q Q, CHANG Z S, FU M K, et al.Performance analysis of a light uniform device for the solar receiver or reactor[J]. Energy, 2023, 270: 126940.
[11] DU S, XIA T, HE Y L, et al.Experiment and optimization study on the radial graded porous volumetric solar receiver matching non-uniform solar flux distribution[J]. Applied energy, 2020, 275: 115343.
[12] 刘锋章, 程博, 秦宁, 等. 太阳能驱动甲烷重整泡沫反应器聚光特性研究及优化设计[J]. 太阳能学报, 2024, 45(7): 599-606.
LIU F Z, CHENG B, QIN N, et al.Research on condensation performance and optimization of solar-driven methane reforming foam reactors[J]. Acta energiae solaris sinica, 2024, 45(7): 599-606.
[13] ALI M, RADY M, ATTIA M A A, et al. Consistent coupled optical and thermal analysis of volumetric solar receivers with honeycomb absorbers[J]. Renewable energy, 2020, 145: 1849-1861.
[14] ZHANG S D, SUN C, SUN F X, et al.Spectral properties of an UV fused silica within 0.8 to 5 µm at elevated temperatures[J]. Infrared physics & technology, 2017, 85: 293-299.
[15] XIA X L, CHEN X, SUN C, et al.Experiment on the convective heat transfer from airflow to skeleton in open-cell porous foams[J]. International journal of heat and mass transfer, 2017, 106: 83-90.
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