沉积Ag纳米层改善定型相变复合纤维膜的传热性能

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

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。

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 fom-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.