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Thermal Performances of High-Temperature Thermal Energy Storage System with Tin Embedded in Copper Matrix by Theoretical Methods

  • LAN Yingying ,
  • HUANG Congliang ,
  • GUO Chuwen
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  • 1. Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou 221116, China
    2. School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
    3. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA

网络出版日期: 2023-12-01

基金资助

This work has been supported by the Fundamental Research Funds for the Central Universities (2020ZDPY0215).

版权

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

Thermal Performances of High-Temperature Thermal Energy Storage System with Tin Embedded in Copper Matrix by Theoretical Methods

  • LAN Yingying ,
  • HUANG Congliang ,
  • GUO Chuwen
Expand
  • 1. Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xuzhou 221116, China
    2. School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
    3. Department of Mechanical Engineering, University of Colorado, Boulder, Colorado 80309, USA

Online published: 2023-12-01

Supported by

This work has been supported by the Fundamental Research Funds for the Central Universities (2020ZDPY0215).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2022

摘要

为了提高太阳能蓄热系统的蓄热效率以及降低制造成本,迫切需要开发更先进的高温蓄热系统。 本文研究了以铜为基体和锡为相变材料(PCM)的两种典型相变体系,即锡颗粒嵌入铜基体形成的三维结构体系和锡线嵌入铜基体形成的二维结构体系。 由于纳米材料的热物性与宏观材料相比有很大的差异,因此,我们首先从理论上分析了PCM和基体的热物性,如通过动力学方法获得热导率以及基于林德曼判据推导比热容。 然后,利用这些特性分别对三维和二维结构系统的蓄热性能进行估算,并从理论上研究了三维和二维结构系统中结构对传热效率的影响。 结果表明,与二维结构体系相比,三维结构体系具有更大的比表面积、更大的比热容和更大的导热系数,是一种更好的选择。 当特征尺寸减小到锡的临界值(约500纳米)以下时,系统的导热系数呈指数衰减,而比热容呈线性增加。 此外,当锡的几何特征尺寸小于临界值(三维结构体系为15纳米, 二维结构体系为25纳米)时,铜基体无法起到提高整个体系有效热导率的作用。

本文引用格式

LAN Yingying , HUANG Congliang , GUO Chuwen . Thermal Performances of High-Temperature Thermal Energy Storage System with Tin Embedded in Copper Matrix by Theoretical Methods[J]. 热科学学报, 2022 , 31(5) : 1327 -1336 . DOI: 10.1007/s11630-022-1618-5

Abstract

There is a critical need to develop advanced high-temperature thermal storage systems to improve efficiencies and reduce the costs of solar thermal storage system. In this work, two typical systems composed with Cu as matrix and Sn as the phase change material (PCM) are explored, namely, the 3-deimentional (3D) structure system by embedding Sn particles into Cu matrix and the 2-deimentional (2D) structure system by embedding Sn wires into Cu matrix. Given the thermophysical properties of a nanomaterial could be importantly different from that of a bulk one, we thus firstly derive the thermophysical properties of PCM and matrix theoretically, like the thermal conductivity by kinetic method and the specific heat capacity based on Lindemann’s criterion. And then, these properties are utilized to estimate the energy storage ability in both 3D and 2D structure system, and the influence of structure on heat transfer efficiency is theoretically investigated in both 3D and 2D structure system. Results turn out that 3D structure system is a better choice than a 2D structure system, because of larger specific surface area, a larger sensitive heat capacity and a larger thermal conductivity. When the feature size of the PCM decreases to be less than a critical value which is about 500 nm for Sn, the thermal conductivity of the system decreases exponentially while the heat storage capacity increases lineally. Moreover, when the feature size of Sn geometry is less than a critical value, which is 15 nm for 3D structure system and 25 nm for 2D structure, the Cu matrix can’t play a role in improving the effective thermal conductivity of the whole system.

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