Abstract

Phase change energy storage technology is an important technology to solve the contradiction between energy supply and demand and improve energy efficiency. In the fields of fruit and vegetable preservation, cold chain logistics, chemical industry, medicine and other fields, low-temperature phase change materials below 0 °C have great application space, but many phase change materials have large supercooling, low thermal conductivity, mechanical properties and heat. Poor stability restricts its application in practice. In this study, using the principles of phase balance and phase law and a combination of theory and experiment, an efficient, stable, non-toxic and safe composite phase change material was developed. Using decyl alcohol (DA) and lauryl alcohol (LA) as substrates, adding covalently modified hydroxylated multi-walled carbon nanotubes (MWCNT-OH) with different mass fractions and adding sodium dodecyl benzene sulfonate (SDBS) are used as a dispersant to promote the nanoparticles to be better dispersed in the solution through ultrasonic vibration and to explore the thermal performance and thermal cycle stability of composite phase change materials. The results show that there are no supercooling and no phase separation after DA–LA eutectic. After adding MWCNT-OH and SDBS, the thermal conductivity of the composite phase change material is effectively improved and has little effect on the phase change enthalpy and phase change temperature. DA–LA/MWCNT-OH/SDBS still has good thermal stability after 200 high- and low-temperature cycle.

Graphic abstract

中文翻译：

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共晶脂肪醇在冷库中的开发，表征和改性研究

摘要

相变储能技术是解决能源供需矛盾，提高能源利用效率的重要技术。在果蔬保鲜，冷链物流，化工，医药等领域，0°C以下的低温相变材料具有广阔的应用空间，但许多相变材料过冷度大，导热系数低，机械性强。性质和热量。稳定性差限制了其在实践中的应用。在这项研究中，利用相平衡和相定律的原理以及理论和实验的结合，开发了一种高效，稳定，无毒且安全的复合相变材料。使用癸醇（DA）和月桂醇（LA）作为底物，添加不同质量分数的共价改性羟基化多壁碳纳米管（MWCNT-OH）和添加十二烷基苯磺酸钠（SDBS）作为分散剂可通过超声振动促进纳米颗粒更好地分散在溶液中并探索复合相变材料的热性能和热循环稳定性。结果表明，DA-LA共晶后没有过冷且没有相分离。加入MWCNT-OH和SDBS后，复合相变材料的热导率得到有效提高，对相变焓和相变温度影响很小。经过200次高温和低温循环后，DA–LA / MWCNT-OH / SDBS仍具有良好的热稳定性。

图形摘要