Numerical Simulation of Charging Performance of Combined Sensible-Latent Heat Storage System with a Macro-Encapsulation Method

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  • 1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Energy and Power Engineering, Beijing University of Technology, Beijing 100124, China
    2. Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Energy and Power Engineering, Beijing University of Technology, Beijing 100124, China

网络出版日期: 2023-11-26

基金资助

This work was supported by Science and technology plan of Inner Mongolia Autonomous Region of China (Grant numbers 2019ZD014).

版权

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

Numerical Simulation of Charging Performance of Combined Sensible-Latent Heat Storage System with a Macro-Encapsulation Method

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  • 1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, College of Energy and Power Engineering, Beijing University of Technology, Beijing 100124, China
    2. Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Energy and Power Engineering, Beijing University of Technology, Beijing 100124, China

Online published: 2023-11-26

Supported by

This work was supported by Science and technology plan of Inner Mongolia Autonomous Region of China (Grant numbers 2019ZD014).

Copyright

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

摘要

近年来,显热蓄热材料与相变蓄热材料相结合的蓄热系统越来越受到人们的重视。在本文中,我们提出了一种采用宏观封装方法封装相变材料的复合蓄热结构,并通过CFD模拟分析了不同影响因素下其蓄热性能。该结构的显热蓄热材料为镁砖或高温混凝土,相变材料为混合熔盐。首先,分析了复合蓄热结构在蓄热过程中的传热特性。然后,分析了加热工况对蓄热性能的影响,在受热面最高温度不超过500℃的条件下,蓄热能力随加热功率先增大后减小。其次,我们比较了不同纯固体蓄热结构和复合蓄热结构的蓄热性能,发现显热蓄热材料无论是镁砖还是高温混凝土,复合蓄热结构的蓄热性能都要弱于纯固体蓄热结构,这是由于熔盐的导热系数显著低于这两种显热蓄热材料。然后,比较了相变材料为不同熔盐时复合蓄热结构的蓄热性能,发现采用低熔点的相变材料时,其具有更强的自然对流强度和更好的蓄热性能。最后,我们选用了具有高导热系数和比热的复合相变材料(CPCM)为相变材料,结果表明:与纯固体结构相比,其蓄热性能提高了22.5%。上述结果表明,采用宏封装方法的复合蓄热结构是一种潜在的热能存储形式,但仍需进一步优化。

本文引用格式

WANG Wei, PAN Zhenfei, LEI Biao, WU Yuting, WANG Jingfu, MA Chongfang . Numerical Simulation of Charging Performance of Combined Sensible-Latent Heat Storage System with a Macro-Encapsulation Method[J]. 热科学学报, 2023 , 32(6) : 2008 -2017 . DOI: 10.1007/s11630-022-1681-y

Abstract

In recent years, heat storage system combining sensible and latent heat materials has received more and more attentions. In this paper, we proposed the hybrid configuration with a macro-encapsulation, and analyzed its charging performance with different influencing factors by CFD simulation. In the case, the sensible heat storage materials are magnesia brick or HT concrete and the phase change materials (PCMs) are mixed molten salts. Firstly, we analyzed the heat transfer characteristics of the hybrid configuration in charging process. Then, we analyzed the effect of heating power on charging performance. The maximum temperature of the heating surface shall not exceed 500°C as the constraint condition, the heat storage capacity increases at first and then decreases with the heating power. Then, we compared the charging performance of different solid structure and the hybrid configurations. Whether magnesia brick or HT concrete, the charging performance of the solid structure is better than that of the hybrid configuration, because the thermal conductivity of the molten salt is significantly lower than that of the two sensible heat storage materials. Then, we compared the charging performance of different molten salts. The hybrid configuration with lower melting point molten salt has better performance because of more intensity natural convection. Finally, we analyzed the charging performance of the hybrid configuration used the composite phase change material (CPCM) with high thermal conductivity and specific heat. From the result, the charging performance increases by 22.5% compared with the solid structure. These results indicate that the hybrid configuration with the macro-encapsulation method is a potential form of thermal energy storage, but it needs to be further optimized.

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