The Optimization of Molten Salt Melting Process in Direct Absorption Solar Collectors by Filling Dynamic Sinkable Copper Foam Plate

IF 2.9 4区工程技术 Q3 CHEMISTRY, PHYSICAL

International Journal of Thermophysics Pub Date : 2025-07-04 DOI:10.1007/s10765-025-03592-8

Zhu Zhiwei, Zhou Ruirui, Liu Yi, Li Ling

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Abstract

A dynamic sinkable copper foam plate (DSCFP) was developed to enhance the melting efficiency of molten salt in direct absorption solar collectors (DASC). The proposed approach develops a simple and reliable method to simultaneously balance light penetration and photothermal conversion efficiency in molten salts. Compared with molten salt without copper foam, the DSCFP significantly improves the absorption of incident solar radiation. In comparison to a fully filled copper foam structure, the DSCFP increased the Nu by 5.27 times, resulting in a 12.1 % reduction in melting time and a 23.2 % improvement in thermal efficiency. Moreover, the thickness and pore density of the copper foam were found to have a significant impact on the thermal performance of the DASC. Reducing the foam thickness from 4 to 2 cm led to a 134.4 % decrease in melting time and a 1.8 % increase in thermal efficiency. Similarly, decreasing the pore density of the copper foam from 20 to 10 ppi resulted in a 26.5 % increase in melting time and a 2.5 % decrease in thermal efficiency.

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动态沉铜泡沫板填充直接吸收太阳能集热器熔盐工艺优化

为了提高直接吸收太阳能集热器（DASC）中熔盐的熔化效率，研制了一种动态下沉泡沫铜板（DSCFP）。该方法提供了一种简单可靠的方法来同时平衡熔盐中的光穿透和光热转换效率。与不含铜泡沫的熔盐相比，DSCFP显著提高了对入射太阳辐射的吸收。与完全填充的泡沫铜结构相比，DSCFP的Nu值提高了5.27倍，熔化时间缩短了12.1%，热效率提高了23.2%。此外，泡沫铜的厚度和孔隙密度对DASC的热性能有显著影响。将泡沫厚度从4厘米减少到2厘米，熔化时间减少了134.4%，热效率提高了1.8%。同样，将泡沫铜的孔密度从20 ppi降低到10 ppi，导致熔化时间增加26.5%，热效率降低2.5%。

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来源期刊

International Journal of Thermophysics 物理-力学

CiteScore

4.10

自引率

9.10%

发文量

179

审稿时长

5 months

期刊介绍： International Journal of Thermophysics serves as an international medium for the publication of papers in thermophysics, assisting both generators and users of thermophysical properties data. This distinguished journal publishes both experimental and theoretical papers on thermophysical properties of matter in the liquid, gaseous, and solid states (including soft matter, biofluids, and nano- and bio-materials), on instrumentation and techniques leading to their measurement, and on computer studies of model and related systems. Studies in all ranges of temperature, pressure, wavelength, and other relevant variables are included.