沉积Ag纳米层改善定型相变复合纤维膜的传热性能

以癸酸(CA)、月桂酸(LA)和肉豆蔻酸(MA)为原料制备了新型的脂肪酸三元低共熔物(CA-LA-MA),并将其作为固-液相变材料,以沉积2 h银(Ag)纳米颗粒的静电纺聚丙烯腈(PAN)纳米纤维膜为支撑材料,通过物理吸附法制备了新型的CA-LA-MA/PAN和CA-LA-MA/PAN/Ag定型相变复合纤维膜。研究了磁控溅射Ag纳米层对定型相变复合纤维传热性能的影响。结果表明,沉积Ag纳米层后定型相变复合纤维膜的储热和放热时间分别缩短了31%和25%。制备的CA-LA-MA/PAN/Ag定型相变复合纤维膜的融化温度和结晶温度分别为19.87℃和11.63℃,融化焓值和结晶焓值分别为123.1 kJ/kg和121.5 kJ/kg。

Heat Transfer Properties of Form-Stable Phase Change Composite Fibers Membranes Improved by Coated Ag Nanolayers

A novel CA-LA-MA ternary fatty acid eutectic was firstly prepared using the three fatty acids such as capric acid (CA),laurie acid (LA),myristic acid (MA),and then was selected as solid-liquid phase-change materials (PCMs).The Ag-coated polyacrylonitrile (PAN) nanofibers membranes was selected as supporting materials to prepare the CA-LA-MA/PAN and CA-LA-MA/PAN/Ag form-stable phase change composite nanofibers membranes by physical adsorption method.The effect of coated Ag nanolayers on heat transfer rates of form-stable phase change composite nanofibers membranes was studied in this paper.The results suggest that the melting and freezing time are respectively reduced about 31％ and 25％ due to coating of the Ag nanoparticles.The melting and freezing temperatures of the CA-LA-MA/PAN/Ag form-stable phase change composite nanofibers membranes are 19.87 ℃and 11.63 ℃,respectively.And the melting and freezing enthalpies are 123.1 kJ/kg and 121.5 kJ/kg,respectively.