化工学报2019，Vol.70Issue(9)：3553-3564,12.DOI:10.11949/0438-1157.20190179
高导热膨胀石墨/棕榈酸定形复合相变材料的制备及储热性能研究
Preparation and thermal energy storage properties of high heat conduction expanded graphite/palmitic acid form-stable phase change materials
摘要
Abstract
A kind of composite phase change materials (PCMs) was prepared by the process of"melting blend -solidification and form-stable"to improve the comprehensive performance of PCMs. Palmitic acid (PA) is used as PCM and expanded graphite (EG) is used for the supporting material. Twenty-one kinds of form-stable composite PCMs were prepared with different contents of EG. The morphologies and structures were characterized microscopically by SEM. On this basis, heat transfer performance analysis, thermophysical test, thermal stability test and heat storage performance analysis were conducted. SEM morphological characterization showed that PA could be absorbed into the pores of EG and the distribution was uniform. DSC test results revealed that the melting enthalpy of PCMs is 193.01 J/g with the 70%(mass) PA corresponding to the melting point of 61.08℃. The melting enthalpy of pure PA is 275.35 J/g corresponding to the melting point of 59.53℃. The thermal conductivity of the PCMs is significantly improved by the addition of EG. When the sample density was 900 kg/m3 and the content of EG was 30%(mass), the thermal conductivity of the composite PCM is 14.09 W/(m·K), which is about 87 times higher than that of pure PA. Cycle stability tests were carried out, the results suggest the samples with 24% and 30% EG content have no any change in shape, and therefore show excellent cycle stability in repeating charging and discharging processes.关键词
棕榈酸/膨胀石墨/定形/相变材料/制备/储热性能Key words
palmitic acid/expanded graphite/form-stable/phase change materials (PCMs)/preparation/thermal energy storage performance分类
能源科技引用本文复制引用
吴韶飞,闫霆,蒯子函,潘卫国..高导热膨胀石墨/棕榈酸定形复合相变材料的制备及储热性能研究[J].化工学报,2019,70(9):3553-3564,12.基金项目
国家自然科学基金项目(21546014) （21546014）
上海市科委科技攻关项目(18DZ1202502). （18DZ1202502）
