Department of Materials Science and Physical Chemistry, Universitat de Barcelona, Martí i Franqués 1⁻11, 08007 Barcelona, Spain.
Birmingham Centre for Energy Storage & School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK.
Molecules. 2019 Mar 29;24(7):1232. doi: 10.3390/molecules24071232.
The use of adequate thermal energy storage (TES) systems is an opportunity to increase energy efficiency in the building sector, and so decrease both commercial and residential energy consumptions. Nano-enhanced phase change materials (NEPCM) have attracted attention to address one of the crucial barriers (i.e. low thermal conductivity) to the adoption of phase change materials (PCM) in this sector. In the present study two PCM based on fatty acids, capric and palmitic acid, were nano-enhanced with low contents (1.0 wt.%, 1.5 wt.% and 3.0 wt.%) of copper (II) oxide (CuO) nanoparticles. Copper (II) oxide (CuO) was synthesized via coprecipitation method obtaining 60⁻120 nm diameter sized nanoparticles. Thermal stability and high thermal conductivity were observed for the nano-enhanced phase change materials (NEPCM) obtained. Experimental results revealed remarkable increments in NEPCM thermal conductivity, for instance palmitic acid thermal conductivity was increased up to 60% with the addition of 3 wt.% CuO nanoparticles. Moreover, CuO nanoparticles sedimentation velocity decreases when increasing its content.
在建筑领域，充分利用热能存储（TES）系统是提高能源效率的机会，从而降低商业和住宅的能源消耗。纳米增强相变材料（NEPCM）已经引起了人们的关注，以解决在该领域采用相变材料（PCM）的一个关键障碍（即低导热率）。在本研究中，两种基于脂肪酸的 PCM，癸酸和棕榈酸，用低含量（1.0wt.%、1.5wt.%和 3.0wt.%）的氧化铜（CuO）纳米颗粒进行了纳米增强。氧化铜（CuO）通过共沉淀法合成，得到了 60-120nm 直径的纳米颗粒。所获得的纳米增强相变材料（NEPCM）表现出良好的热稳定性和高导热性。实验结果表明，NEPCM 的导热系数显著提高，例如，添加 3wt.%CuO 纳米颗粒可使棕榈酸的导热系数提高 60%。此外，随着 CuO 纳米颗粒含量的增加，其沉降速度降低。
