石蜡-硬脂酸/石墨复合相变材料的储热性能研究

由二元相图确定出石蜡-硬脂酸二元低共熔物的质量配比为m(石蜡)∶m(硬脂酸)=17∶8,按上述配比通过熔融共混法制备出石蜡-硬脂酸复合相变材料,将石蜡-硬脂酸复合相变材料与石墨通过熔融共混法制备出石蜡-硬脂酸/石墨复合相变材料,通过储/放热实验和差示扫描量热法(DSC)对石蜡-硬脂酸和石蜡-硬脂酸/石墨复合相变材料的热性能进行了测试和表征。结果表明,石蜡-硬脂酸复合相变材料的相变储热性能好;随着石墨含量的增加,石蜡-硬脂酸/石墨复合相变材料的储/放热时间明显缩短,导热性能大幅度提高,但相变潜热逐渐降低,相变温度保持不变。制备的石蜡-硬脂酸/石墨复合相变材料具有合适的相变温度、较高的相变潜热,导热性能优良,可用于低温储能领域。

Thermal energy storage properties of paraffin-stearic acid/graphite composite phase change material

According to the eutectic phase diagram of the binary paraffin-stearic acid,the eutectic mass ratio of the paraffin-stearic acid is m(paraffin)∶m(stearic acid)=17∶8.Paraffin-stearic acid composite phase change material was prepared by the melt blending method.Paraffin-stearic acid/graphite composite phase change material was also prepared by the melt blending method with the binary paraffin-stearic acid eutectic and graphite.The thermal properties of paraffin-stearic acid and paraffin-stearic acid/graphite composite phase change material were studied by the thermal energy storage/release experiment and differential scanning calorimeter(DSC).The results showed that the thermal energy storage properties of the paraffin-stearic acid composite phase change material were good in the process of phase change.Results showed that its thermal energy storage/release time was significantly shortened,its thermal conductivity was greatly improved,the latent heat was gradually decreased and the phase change temperature did not change with the increase of the content of the graphite in the paraffin-stearic acid/graphite composite phase change material when compared with the paraffin-stearic acid.The prepared paraffin-stearic acid/graphite composite phase change material had proper phase change temperature and high latent heat.The paraffin-stearic acid/graphite composite phase change material was suitable for the application in thermal energy storage at low temperature.