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棕榈酸是有机固液相变材料,本文通过添加膨胀石墨对其性能进行改善并采用扫描电镜(SEM)、差示扫描量热仪(DSC)、充/放热性能测试对制备出的膨胀石墨质量分数分别为1%,3%,5%,8%的棕榈酸/膨胀石墨复合相变储能材料的结构及热性能进行表征。结果表明,棕榈酸/膨胀石墨复合相变材料保持了膨胀石墨原来疏松多孔的蠕虫状结构,其相变温度与棕榈酸相似,相变潜热与对应质量含量下的棕榈酸相当;随着膨胀石墨添加量的增多,受到黏度和自然对流双重作用的影响,复合相变材料的蓄放热速率先减小后增大,因此适量的膨胀石墨可改善棕榈酸的传热性能。
Palmitic acid is an organic solid-liquid phase-change material. In this paper, the properties of expanded graphite were improved and the properties of the prepared expanded graphite were analyzed by scanning electron microscopy (SEM), differential scanning calorimetry (DSC) The structure and thermal properties of 1%, 3%, 5%, 8% palmitic / expanded graphite composite phase change energy storage materials were characterized. The results showed that the phase transition temperature of palmitic acid / expanded graphite composite phase change material was similar to that of palmitic acid, while the phase transition temperature was similar to that of palmitic acid with corresponding mass content. Due to the double effect of viscosity and natural convection, the heat storage and storage rate of the composite phase change material first decreases and then increases, so that an appropriate amount of expanded graphite can improve the heat transfer performance of the palmitic acid.