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<p>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 <i>Nu</i> 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&#xa0;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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Zhu Zhiwei,
  • Zhou Ruirui,
  • Liu Yi,
  • Li Ling

摘要

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.