辛酸-硬脂醇二元混合物作为冷储能系统相变材料的表征及可靠性

Characterization and Reliability of Caprylic Acid-Stearyl Alcohol Binary Mixture as Phase Change Material for a Cold Energy Storage System.

作者信息

Ayaz Hamza, Chinnasamy Veerakumar, Cho Honghyun

机构信息

Graduate School, Chosun University, 309 Pilmundaero, Gwangju 61452, Korea.

Department of Mechanical Engineering, Chosun University, 309 Pilmundaero, Gwangju 61452, Korea.

出版信息

Materials (Basel). 2021 Dec 3;14(23):7418. doi: 10.3390/ma14237418.

DOI:10.3390/ma14237418

PMID:34885573

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8659032/

Abstract

This study reports the in-depth investigation of the thermophysical properties and thermal reliability of caprylic acid-stearyl alcohol (CA-SA) eutectic phase change material (PCM) for cooling applications. The phase diagram of CA-SA showed a eutectic point at a 90:10 molar ratio. The onset melting/freezing temperature and latent heat of fusion of caprylic acid-stearyl alcohol from the differential scanning calorimetry (DSC) were 11.4 °C/11.8 °C and 154.4/150.5 J/g, respectively. The thermal conductivity for the prepared eutectic PCM in the solid phase was 0.267 W/m.K (0 °C), whereas, in the liquid phase, it was 0.165 W/m.K (20 °C). In addition, the maximum relative percentage difference (RPD) marked at the end of 200 thermal cycles was 5.2% for onset melting temperature and 18.9% for phase change enthalpy. The Fourier transform infrared spectroscopy (FT-IR) result shows that the eutectic PCM holds good chemical stability. Corrosion tests showed that caprylic acid-stearyl alcohol could be a potential candidate for cold thermal energy storage applications.

摘要

本研究报告了对用于冷却应用的辛酸 - 硬脂醇（CA - SA）共晶相变材料（PCM）的热物理性质和热可靠性的深入研究。CA - SA的相图显示在90:10摩尔比处有一个共晶点。通过差示扫描量热法（DSC）测得的辛酸 - 硬脂醇的起始熔化/凝固温度和熔化潜热分别为11.4℃/11.8℃和154.4/150.5 J/g。制备的共晶PCM在固相中热导率为0.267 W/m·K（0℃），而在液相中热导率为0.165 W/m·K（20℃）。此外，在200次热循环结束时，起始熔化温度的最大相对百分比差异（RPD）为5.2%，相变焓的最大相对百分比差异为18.9%。傅里叶变换红外光谱（FT - IR）结果表明共晶PCM具有良好的化学稳定性。腐蚀试验表明，辛酸 - 硬脂醇可能是冷热能储存应用的潜在候选材料。