旋转热边界下球形蓄热单元内PW/SEBS/EG复合相变材料的传热特性

doi:10.19799/j.cnki.2095-4239.2024.0935

摘要/Abstract

摘要：

相变填充床储能系统可以高效储能，实现能源的有效利用。为进一步提高相变填充床的蓄热效率，本工作提出了一种采用膨胀石墨(EG)增强石蜡(PW)导热性能的复合相变材料(CPCMs)，并添加少量苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(SEBS)以抑制碳材料沉降分层，增强蓄热材料的稳定性。通过实验测试和数值模拟相结合的方式，详细研究了CPCMs应用于球形蓄热单元的传热性能，分析了流体介质不同转速对单个球形蓄热单元的蓄热性能影响。研究表明，当EG含量为5%(质量分数)时，蓄热单元完全蓄热时间比纯石蜡蓄热单元缩短了67.8%。转动的传热流体极大地提升了球形蓄热单元的传热性能，且当转速为0.5 rad/s时，CPCMs球形蓄热单元的传热性能效果达到最优。研究结果可为相变填充床的效能提升提供理论基础。

关键词: 复合相变材料, 球形蓄热单元, 数值模拟, 旋转流体边界, 传热效率

Abstract:

Phase change material (PCM)-filled bed energy storage systems offer an excellent solution for storing thermal energy, enabling better energy utilization. To further enhance the energy storage efficiency of PCM-filled beds, this study proposes a composite PCM (CPCM) that incorporates expanded graphite (EG) to improve the thermal conductivity of paraffin wax (PW). In addition, a small amount of styrene-ethylene-butylene-styrene block copolymer (SEBS) is added to enhance the stability of the storage material. The heat transfer performance of CPCMs applied in spherical thermal storage units is thoroughly investigated through experimental testing and numerical simulations. Furthermore, the impact of different rotational speeds of the heat transfer fluid on the thermal storage performance of individual spherical units is analyzed.Resultsdemonstrate that when an EG concentration of 5% reduces the time required for complete thermal charging of the storage unit by 67.8% compared to pure paraffin wax. In addition, rotating the heat transfer fluid significantly enhances the heat transfer performance of the spherical storage units. The optimal heat transfer performance is achieved at a rotational speed of 0.5 rad/s. Thus, the results of this study provide a theoretical foundation for improving the efficiency of PCM-filled beds.

Key words: composite phase change materials, spherical thermal storage units, numerical simulation, rotating fluid boundary, heat transfer efficiency

中图分类号:

TK 513

黄喆, 于志明, 卿召进, 张兆利. 旋转热边界下球形蓄热单元内PW/SEBS/EG复合相变材料的传热特性[J]. 储能科学与技术, 2025, 14(4): 1413-1423.

Zhe HUANG, Zhiming YU, Zhaojin QING, Zhaoli ZHANG. Heat transfer characteristics of spherical thermal storage units based on PW/SEBS/EG composite phase change materials in a rotating fluid medium[J]. Energy Storage Science and Technology, 2025, 14(4): 1413-1423.

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项目	导热系数/[W/(m·K)]	密度/(kg/m³)	比热容/[J/(kg·K)]	相变温度/℃	焓值/(J/g)
CPCMs	2.46	1010	2000	38.21	162.1
环境流体	0.6	998.2	4182	—	—

相变材料	导热系数/[W/(m·K)]	密度/(kg/m³)	熔化温度/℃	熔化焓值/(J/g)	凝固温度/℃	凝固焓值/(J/g)
PW	0.23	828	39.24	175.7	40.73	182.9
PW/SEBS/EG-2%(mass fraction)	0.57	968	38.46	164.5	40.73	168.6
PW/SEBS/EG-3%(mass fraction)	0.97	970	38.55	171.8	40.95	166.1
PW/SEBS/EG-4%(mass fraction)	1.38	990	38.25	166.9	40.99	162.7
PW/SEBS/EG-5%(mass fraction)	2.46	1010	38.21	162.1	40.93	156.0

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