石蜡/膨胀石墨复合定形相变材料的制备及季节适应性研究

Preparation and Seasonal A daptability of Paraffin/Expanded Graphite Composite Shaped Phase Change Materials

以石蜡与白油混合制成的复合相变石蜡作为相变主体材料,以不同质量分数的膨胀石墨作载体材料,应用熔融共混方法,制备出5种不同比例的复合定形相变材料,对其进行吸附性能、热物性能测试,确定了复合定形相变材料的最优配比,并采用数值模拟方法研究该复合定形相变材料在冬、夏两季的适应性。结果表明:复合定形相变材料的最优配比为:膨胀石墨的质量分数为7%,复合相变石蜡的质量分数为93%,复合相变石蜡中52#切片石蜡与3#白油质量比为55∶45;该配比复合定形相变材料的相变温度为27.5℃,相变潜热为83.56 J/g,质量损失率为2.12%,导热系数为0.5316 W·m^(-1)·K^(-1);作为建筑外墙材料时,该复合定形相变材料能够平缓峰谷热流、减小温度波动,且在夏季的适应性强于冬季。研制的石蜡/膨胀石墨复合定形相变材料有望作为建筑调温相变材料在夏热冬冷地区应用。

Through the melt mixing process,five different ratios of composite shaped phase change materials were prepared.The main phase change material was paraffin combined with white oil,and the carrier material was expanded graphite with various mass fractions.The optimal ratio of composite shaped phase change materials was identified through adsorption performance and thermophysical performance tests.Numerical simulation method was used to study the adaptability of the composite shaped phase change material in winter and summer.The results show that the ideal composition of composite shaped phase change materials is 7%expanded graphite and 93%composite phase change paraffin.The mass ratio of 52#slice paraffin to 3#white oil in composite phase change paraffin is 55∶45.Phase change temperature is 27.5℃,latent heat of phase change is 83.56 J/g,mass loss rate is 2.12%,and thermal conductivity is 0.5316 W·m^(-1)·K^(-1).When used as a building facade material,composite shaped phase change materials can smooth out peak and valley heat flows,reduce indoor temperature fluctuations,and be more adaptable in summer than in winter.Paraffin/expanded graphite composite shaped phase change materials are expec-ted to be used as building thermoregulation phase change materials for hot summer and cold winter regions.