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本文通过将纳米氧化锌(ZnO)颗粒加入熔融的石蜡(PW)并进行搅拌和超声制备了一种纳米ZnO/PW复合相变储能材料。为使纳米氧化锌在基体物质中分散均匀,在制备过程中使用了搅拌和超声以制备均匀的复合材料。使用扫描电镜观察其微观结构表明氧化锌在石蜡中分散良好。对所得ZnO/PW复合相变材料的相变温度、相变焓及导热系数等热物理性质进行了分析。结果表明,ZnO/PW复合相变储能材料的融化温度和融化焓均较纯石蜡的融化温度和融化焓均有所升高。在不发生相变时,ZnO/PW复合物的导热系数随温度的变化不大。ZnO/PW复合物在测试温度下的导热系数较基体PW有不同程度的提高,其提高程度基本随纳米ZnO的含量的增加而增加。
In this paper, a nano-ZnO / PW composite phase change energy storage material was prepared by adding nano-ZnO particles into molten paraffin (PW) and stirring and ultrasonicating. In order to disperse nanometer zinc oxide evenly in the matrix material, stirring and sonication are used during preparation to prepare a uniform composite material. The observation of the microstructure using scanning electron microscopy showed that zinc oxide was well dispersed in paraffin. The thermophysical properties of the obtained ZnO / PW composite phase change materials such as phase transition temperature, enthalpy of transformation and thermal conductivity were analyzed. The results show that the melting temperature and melting enthalpy of ZnO / PW composite phase change energy storage materials are both higher than the melting temperature and melting enthalpy of pure paraffin. The thermal conductivity of ZnO / PW composites does not change much with the temperature in the absence of phase transition. The thermal conductivity of ZnO / PW composite at different temperatures is higher than that of matrix PW, and the enhancement degree of ZnO / PW composite increases with the increase of nano-ZnO content.