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以研究癸酸—月桂酸二元复合相变储能材料在循环相变过程中的热稳定性为目的,搭建了实现相变材料加速热循环过程的实验平台,并利用差示扫描量热仪(DSC)测定了经过0,800,1 600,2 400,3 200,4 000次加速热循环后相变材料的相变温度和相变潜热。经过4 000次循环后,相变温度下降了0.8℃,相变潜热降低为初始值的92.08%。结果表明:随着循环次数的增加,该相变材料的相变温度变化微小,相变潜热有所降低,其热稳定性比较好。基于实验结果,讨论了此种相变材料在太阳能及建筑节能领域的应用前景。
In order to study the thermal stability of capric acid-lauric acid binary composite phase change energy storage material during cyclic phase change, an experimental platform for accelerating the thermal cycling of phase change material was set up. The differential scanning calorimeter (DSC) was used to measure the phase transition temperature and latent heat of phase change material after 0,800,1 600,2 400,3 200,400 accelerated thermal cycles. After 4 000 cycles, the phase transition temperature decreased by 0.8 ° C, and the latent heat of phase transformation decreased to 92.08% of the initial value. The results show that with the increase of the number of cycles, the phase change temperature of the phase change material is small and the latent heat of phase transformation decreases, and its thermal stability is better. Based on the experimental results, the application prospects of such phase change materials in solar energy and building energy conservation are discussed.