Improving the thermal response flexibility of 2- and 3-phase composite phase change materials by metallic triply periodic minimal surface structures
JOURNAL OF ENERGY STORAGE(2023)
摘要
The percolation of organic Phase Change Materials (PCMs) into metallic skeletons produces Composite PCMs (C-PCMs). This paper explores Al-Si-Mg alloy Sheet-based Primitive-Schwarz (PS) Triply Periodic Minimal Surface (TPMS) C-PCMs filled by paraffines, comparing them with C-PCMs built with inverse Body-Centred Cubic (BCC) structures. The aim is to derive guidelines for improving the thermal response flexibility of these systems. The lattice geometrical features and C-PCM properties are calculated and modelled as a function of porosity (e), proportional to storable energy. For e > 0.8, the Effective Thermal Conductivity (lambda(eff)) of PS-based C-PCMs is higher than that of BCC-based, reaching 68 % of the maximum theoretical value. Design considerations are used to define a set of feasible C-PCMs whose thermal response is numerically simulated. The PS favours shorter transients than BCC (6.3 % less for e =0.8). The e increase, and, consequently, lambda(eff) reduction, in PS-based C-PCMs raises both storage potential and storage times (542 s vs 694 s for e = 0.8 vs 0.9). Minor changes in the storage times can be obtained by lattice size variation at constant e. The peculiarity of sheet-based TPMSs of splitting the volume into non-interconnected subdomains is exploited to design 3-phase C-PCMs, employing two PCMs having different melting temperatures.
更多查看译文
关键词
Composite phase change materials (PCM),Triply periodic minimal surface,Energy storage,Additive manufacturing
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要