Thermal performance of SGSP with porous layer under heat extraction

IF 7.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Mechanical Sciences Pub Date : 2025-06-06 DOI:10.1016/j.ijmecsci.2025.110472

Jiang-Tao Hu , Shuo-Jun Mei , Lei Wang , Lei Xu

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引用次数: 0

Abstract

Salt gradient solar pond (SGSP) is a promising solar energy collector, which can absorb solar radiation and store it as thermal energy for a long time. Efficient heat extraction is essential for the practical application of SGSP. However, the heat extraction may accelerate the erosion of the salt stratification, as it introduces disturbances to the flow field. This study employs a custom-built Lattice Boltzmann Method (LBM) code to investigate the effects of heat extraction and porous layers on the thermal performance of SGSPs. The results reveal that both heat extraction and the presence of a porous layer effectively suppress thermosolutal convection, thereby enhancing the thermal stability of SGSP. Notably, increasing the heat extraction rate of each tube proves more effective for improving heat storage than adding more extraction tubes. While heat extraction inevitably reduces the thermal storage capacity of SGSP, incorporating a porous layer with lower permeability helps mitigate this effect, promoting long-term thermal storage and stable operation. However, the beneficial influence of the porous layer diminishes under high heat extraction rates. Based on these insights, this study proposes optimized design parameters for porous layers and heat extraction to maximize SGSP performance.

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含多孔层SGSP的热抽提热性能

盐梯度太阳能池（SGSP）是一种很有前途的太阳能集热器，它可以吸收太阳辐射并将其作为热能长期储存。高效的热提取是SGSP实际应用的关键。但抽热会对流场产生扰动，从而加速盐层的侵蚀。本研究采用定制的晶格玻尔兹曼方法（LBM）代码来研究热提取和多孔层对sgsp热性能的影响。结果表明，热抽提和多孔层的存在有效抑制了热溶质对流，从而增强了SGSP的热稳定性。值得注意的是，增加每根抽热管的抽热率比增加抽热管更能有效地改善储热。虽然抽热不可避免地降低了SGSP的储热能力，但加入渗透性较低的多孔层有助于减轻这种影响，促进长期储热和稳定运行。然而，在高抽热速率下，多孔层的有益影响减弱。基于这些见解，本研究提出了多孔层和热提取的优化设计参数，以最大限度地提高SGSP性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mechanical Sciences 工程技术-工程：机械

CiteScore

12.80

自引率

17.80%

发文量

769

审稿时长

19 days

期刊介绍： The International Journal of Mechanical Sciences (IJMS) serves as a global platform for the publication and dissemination of original research that contributes to a deeper scientific understanding of the fundamental disciplines within mechanical, civil, and material engineering. The primary focus of IJMS is to showcase innovative and ground-breaking work that utilizes analytical and computational modeling techniques, such as Finite Element Method (FEM), Boundary Element Method (BEM), and mesh-free methods, among others. These modeling methods are applied to diverse fields including rigid-body mechanics (e.g., dynamics, vibration, stability), structural mechanics, metal forming, advanced materials (e.g., metals, composites, cellular, smart) behavior and applications, impact mechanics, strain localization, and other nonlinear effects (e.g., large deflections, plasticity, fracture). Additionally, IJMS covers the realms of fluid mechanics (both external and internal flows), tribology, thermodynamics, and materials processing. These subjects collectively form the core of the journal's content. In summary, IJMS provides a prestigious platform for researchers to present their original contributions, shedding light on analytical and computational modeling methods in various areas of mechanical engineering, as well as exploring the behavior and application of advanced materials, fluid mechanics, thermodynamics, and materials processing.