基于潜热填充床的双向变粒径结构热性能分析

Thermal performance analysis of bidirectional variable particle size structure based on latent heat packed bed

中文关键词: 填充床，双向变粒径，热能存储，热性能分析

英文关键词: packed-bed, bidirectional variable particle size, Thermal heat storage, Thermal performance analysis

中文摘要:

      为改善潜热填充床的储/释热性能，提出了一种优化的双向变粒径球形储热单元填充结构，并基于实验室搭建的中高温相变储热实验系统，模拟分析了该结构相较于传统结构对填充床储/释热效率和时间的影响。结果表明，在保证相同储热量下，双向变粒径结构能够有效的提升储/释热效率，延长有效热流输出的时间。其中20:30:20（体积比1:1:1）的双向变粒径结构输出有效热流的时间为6685 s，放热功率为846.1 W，相对于其他的填充结构，综合热性能最好。该研究能够为进一步实现储热系统能量的高效稳定与梯度利用做铺垫。

英文摘要:

      In order to improve the thermal performance of latent heat packed bed, a spherical heat storage unit filling structure with optimized bidirectional variable particle size was proposed. And based on the experimental system of medium and high temperature phase change heat storage built in the laboratory, the influence on the heat storage efficiency and time of the latent heat packed bed were simulated and analyzed compared with the traditional structure. The results show that under the condition of ensuring the same heat storage, the bidirectional variable particle size structure can effectively increase the heat storage and release power and prolong the effective heat flow output time. Among them, the 20:30:20 (volume ratio 1:1:1) filling structure can output effective heat flux for 6685 s and release heat power for 846.1W. Compared with other filling structures, it has the best comprehensive thermal performance. This research can pave the way for the further realization of high-efficiency stability and gradient utili-zation of the heat storage system.