| 摘要: |
| 基于流体动力学软件CFD进行仿真模拟，从传热面积和流场两方面考虑肋片对相变换热器换热过程的影响。分析了3种结构形式（双肋式、三肋式、四肋式）下肋高及肋片排布对换热性能的影响，得出最佳结构形式和规格尺寸参数。结果表明：采用双肋式结构形式的肋片可以极大的改善相变储能放热器的储能过程、采用三肋式结构热管的换热器可以更快的进入流场扩张期、对称四肋式换热管在竖向和水平方向都有比较较高的融化速率；在同等传热面积下，双肋式肋片结构具有显著优势。当肋片长度与换热管半径之比为1.5 时，缩短了80%的放热时间，同时凝固总量也提升至87%，高出光管的76%。 |
| 关键词: 管壳式换热器 强化传热 结构优化 相变储能 |
| DOI： |
| Received:May 24, 2022Revised:July 04, 2022 |
| 基金项目:国家自然科学基金（52076158），国网陕西省电力有限公司科技项目（5226KY220003）资助。 |
|
| Study on Performance Enhancement of Shell and Tube Phase Change Thermal Energy Storage Heat Exchangers |
|
Zhu Chao1, Shi Peng1, Wang Zhihua2, Wang Fenghao2, Xu Kaiwen2, Ding Tao3
|
| (1.State Grid Shaanxi Electric Power Research Institute;2.School of Human Settlement Environment and Architectural Engineering，Xi'an Jiaotong University;3.School of Electrical Engineering, Xi'an Jiaotong University) |
| Abstract: |
| Based on the computational fluid dynamics (CFD) software, the effect of fins on the heat transfer process of a phase-change heat exchanger was considered in terms of the heat transfer area and flow field. The influences of the fin height and fin arrangement on the heat transfer performance under three types of structures (double-finned, triple-finned, and quadruple-finned) were analyzed, and the optimal structure and specification parameters were obtained. The results show that the fins with a double-finned structure substantially improve the thermal energy storage performance of the phase-change heat exchanger. The heat exchanger with a triple-finned structure can reach the expansion period of the flow field faster, and the symmetrical quadruple-finned heat exchanger has a relatively high melting rate in the vertical and horizontal directions. Under the same heat transfer area, the double-finned structure has obvious advantages. When the ratio of fin length to heat exchange tube length is 1.5, the discharge time is shortened by 80%, and the total solidification mass increases to 87%, which is 76% higher than that of the bare tube. |
| Key words: shell-and-tube heat exchanger heat transfer enhancement structure optimization phase change thermal energy storage |
