以工业石蜡和脂肪酸二元混合物为研究对象,通过差示扫描量热仪研究其相变温度、相变潜热以及过冷度,旨在降低单纯脂肪酸作为相变材料的应用成本,并拓宽相变温度范围,增加相变潜热值。研究结果表明:相比于单一脂肪酸,石蜡-癸酸和石蜡-月桂酸二元混合物降低了相变温度且提高了相变潜热,适合围护结构储能。石蜡-肉豆蔻酸、石蜡-硬脂酸、石蜡-棕榈酸混合物的相变温度虽然在某些配合比条件下比单一脂肪酸的相变温度低,但仍在40℃以上,不适合应用在围护结构储能中,可用在余热回收用相变换热器等其他节能系统。石蜡-癸酸和石蜡-月桂酸二元混合物的过冷度较小,是围护结构储能的理想材料。

The binary mixtures of paraffin and fatty acid were selected as the research object.The phase change temperature,phase change latent heat and supercooling degree were studied by differential scanning calorimeter,so as to reduce the cost of the single fatty acid as the phase change material,broaden the range of phase change temperature and increased the latent heat of phase change.The results showed that the binary mixtures of paraffin-capric acid and paraffin-lauric acid reduced the phase change temperature and improved latent heat of phase change,which were suitable for energy storage of enclosure structure.The phase change temperature of binary mixtures of paraffin-myristic acid,paraffin-stearic acid,paraffin-palmitic acid were lower than the single fatty acid,but was still more than 40℃.They were not suitable for application in the storage enclosure,but can be used in other energy saving systems,such as the phase change heat exchanger of waste heat recovery.The supercooling degree of the binary mixtures of paraffin-capric acid and paraffin-lauric acid was small,so they were ideal materials for storing energy in the structure.