聚乙二醇/二氧化硅复合相变蓄热材料的性能研究

Study on polyethylene glycol/silicon dioxide composite phase change thermal energy storage material

以二氧化硅(SiO2)为载体、聚乙二醇(PEG)为相变蓄热材料,利用多孔的二氧化硅良好的吸附性能,制备出聚乙二醇/二氧化硅复合相变材料。由于二氧化硅的多孔网络结构,其毛细作用力和表面张力使得聚乙二醇在发生固液相变的过程中,失去了流动性。实验结果证明,聚乙二醇/二氧化硅复合相变材料仍具有较高的蓄热能力。同时二氧化硅作为基体材料形成空间传热网格,较大的提高了相变材料的导热率。

This paper deals with the preparation of polyethylene glycol （PEG）/silicon dioxide （SiO2） composites as phase change material （PCM） for thermal energy storage. In such a composite, Polyethylene glycol serves as a latent heat storage material and silicon dioxide （SiOz） acts as a supporting material, which prevents leakage of the melted polyethylene glycol because of the effect of capillary force and surface tension force. The experimental results showed that the composite has favorable heat capacity, high thermal conductivity and steady performance.