Design of effective fins for fast PCM melting and solidification in shell-and-tube latent heat thermal energy storage through topology optimization
Design of effective fins for fast PCM melting and solidification in shell-and-tube latent heat thermal energy storage through topology optimization
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DOI：
10.1016/j.apenergy.2017.10.050
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发表时间：
2017-12-15
期刊：
影响因子：
11.2
通讯作者：
Verda, Vittorio
中科院分区：
文献类型：
--
作者：
Pizzolato, Alberto;Sharma, Ashesh;Verda, Vittorio
本文提出了一种利用高导热翅片来解决管壳式潜热蓄能机组强化换热问题的独特方法。我们开发了一种利用拓扑优化和多相计算流体力学的设计方法。没有对鳍片布局进行任何假设，其沿着优化过程自由进化，从而产生更有效的非平凡几何形状。在每一次优化迭代中，通过求解带有相变孔隙率项的瞬变N-S方程来计算相变材料中的流体动力响应。将较大的设计自由度与详细的物理模型相结合，可以研究对流输送对潜热蓄热单元设计和性能的影响。结果表明，在设计优化研究中考虑流体流动对性能至关重要。结果表明，采用设计精良、设计独特的翅片，通过自然对流可以显著强化熔化和凝固，这是其他设计路线难以揭示的。这些特点使得针对熔化进行优化的设计与针对凝固进行优化的设计有着根本的不同。
This paper presents a unique solution to the problem of heat transfer intensification in shell-and-tube latent heat thermal energy storage units by means of high conducting fins. We developed a design approach using topology optimization and multi-phase computational fluid dynamics. No assumption is made about the fins layout, which freely evolves along the optimization process resulting in more efficient non-trivial geometries. At each optimization iteration, the fluid-dynamic response in the phase change material is computed by solving the transient Navier-Stokes equations augmented with a phase-change porosity term. Coupling large design freedom to detailed physics modeling allowed studying the effect of convective transport on both design and performance of latent heat thermal storage units. Results indicate that accounting for fluid flow in design optimization studies is crucial for performance. It is shown that melting and solidification can be enhanced remarkably through natural convection by using well engineered fins with specific design features, that could hardly be revealed with alternative design routes. These features make designs optimized for melting fundamentally different from those optimized for solidification.