Effect of periodic heat source conditions on melting performance of composite phase change energy storage tank: A numerical optimization

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-08-11 DOI:10.1016/j.ijheatfluidflow.2025.110007

Xinyu Huang , Yuan Xie , Jiayi Gao , Xiaohu Yang , Bengt Sundén

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引用次数: 0

Abstract

To improve the low thermal conductivity challenge of phase change materials (PCM) in energy storage applications, this study introduces a composite thermal energy storage (TES) unit integrating PCM with water. Numerical simulations are employed to examine the influence of a fluctuating heat source on the heat charging dynamics of the unit. Results derived from Taguchi analysis indicate that increasing the amplitude, half-period, and initial temperature of the fluctuating heat source consistently reduces the melting time. The initial temperature exhibited the most significant effect on accelerating the charging process. Furthermore, elevating the amplitude and initial temperature led to a corresponding increase in the mean energy storage rate of the PCM while extending the half-period initially enhanced, then diminished, the mean energy storage rate. The optimal heat source parameters are identified as Case 4, characterized by an amplitude of 6.5 K, a half-period of 15 s, and an initial temperature of 352 K. Compared to the baseline heat source conditions, this configuration demonstrated a 33.7 % improvement in the mean energy storage rate within the PCM, a 48.9 % increase in water, and a 21.2 % reduction in charging time. These findings indicate that the heat source fluctuation has a significant influence on the energy storage process of the complex energy storage unit.

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周期性热源条件对复合相变储能罐熔化性能影响的数值优化

为了改善相变材料（PCM）在储能应用中的低导热性挑战，本研究引入了一种将相变材料（PCM）与水集成的复合热能存储（TES）装置。采用数值模拟的方法研究了波动热源对机组装热动力学的影响。Taguchi分析的结果表明，增加波动热源的振幅、半周期和初始温度会持续缩短熔化时间。初始温度对加速充电过程的影响最为显著。振幅和初始温度的升高导致相变介质的平均储能速率相应增大，半周期的延长使相变介质的平均储能速率先增大后减小。最佳热源参数为Case 4，其振幅为6.5 K，半周期为15 s，初始温度为352 K。与基准热源条件相比，该配置显示PCM内的平均储能率提高了33.7%，水增加了48.9%，充电时间减少了21.2%。这些结果表明，热源波动对复杂储能单元的储能过程有显著影响。

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 Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.