定形相变墙体传热性能和力学性能的实验研究

Experimental Research on the Heat Transfer and Mechanical Property of Shape-stabilized Phase Change Material Walls

利用液体石蜡-46#石蜡、液体石蜡-月桂酸和癸酸-肉豆蔻酸3种相变材料混合物分别与高密度聚乙烯混合制备定形相变材料。通过直接混合法把定形相变材料加入水泥砂浆制备定形相变墙体。实验研究了相变墙体和普通墙体的传热性能和力学性能。实验结果显示:定形相变墙体表面温度和热流均低于普通墙体;热物性不同的相变材料随着墙体中含量的增加,蓄热效果方面的差别也越来越明显;定形相变墙体的抗压强度明显小于普通墙体;定形相变墙体在受热过程中没有发生渗漏现象。研究结果可为相变材料在墙体中的实际应用提供参考和依据。

The heat transfer and mechanical property of phase change material（PCM） walls and common wall were investigated.Three mixtures of liquid paraffin-46# paraffin,liquid paraffin-lauric acid and capric-myristic acid were prepared and mixed respectively with high-density polyethylene（HDPE） to prepare shape-stabilized phase change materials.Then direct mixing method was used to add these materials into cement mortar in order to make phase change walls.The results show that the temperatures and heat flow on phase change walls＇ surface are all lower than those of common wall;PCMs of different thermal properties have a more and more obvious distinction in heat storage performance with the increasing content of them added in the wall;PCM walls have lower compressive strength than the common one;there is no leakage of all the PCM walls.Results can provide the basis for the application of phase change material walls in real buildings.