用于墙体和地板的相变材料性能

Thermal Performance of Phase Change Materials Used in Wall and Floor

关键词:  石蜡  脂肪酸  二元混合物  相变温度  相变潜热  相变材料

Key words:  paraffin  fatty acid  binary mixture  phase transition temperature  phase transition latent heat  phase change material

摘要:

利用差示扫描量热仪研究了分别由48#石蜡和液态石蜡、癸酸和硬脂酸组成的2种二元混合物的相变温度和相变潜热，并选取其中6种试样进行5000次热循环试验，旨在寻找适合于建筑围护结构中使用的相变储能材料.结果表明：2种二元混合物的相变温度和相变潜热随配制比例的不同发生了较为明显的变化；它们的热稳定性均较好，且脂肪酸混合物的热稳定性优于石蜡混合物.同时给出了适用于被动式相变墙体和主动式相变供暖地板或墙板中使用的相变材料混合物配比.

Abstract:

The phase transition temperature and phase transition latent heat of the binary mixtures were measured by differential scanning calorimetric. One of the binary mixtures was composed of 48# paraffin and liquid paraffin, the other one was composed of capric acid and stearic acid. Six kinds of samples were carried on 5000 times of thermal cycling test, so as to choose suitable materials used in the envelope as energy storage materials. The experimental results show that the phase transition temperature and phase transition latent heat have a significant change with different proportion of the mixtures. Their thermal stabilities are good, and the thermal stability of fatty acid mixtures is better than that of paraffin mixtures. The mix proportion of phase change material used in passive phase change wall and active phase change heating floor or wallboard was given as well.