Capric-myristic acid/vermiculite composite as form-stable phase change material for thermal energy storage
Capric-myristic acid/vermiculite composite as form-stable phase change material for thermal energy storage
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DOI：
10.1016/j.solener.2008.08.012
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发表时间：
2009-03-01
期刊：
影响因子：
6.7
通讯作者：
Sari, Ahmet
中科院分区：
文献类型：
--
作者：
Karaipekli, Ali;Sari, Ahmet
相变材料可与建筑材料相结合，在潜热蓄热系统中获得具有有效储能性能的新型形态稳定复合相变材料。本研究采用真空浸渍法制备了癸酸（CA）、肉豆酱酸（MA）共晶混合物/蛭石（VMT）复合材料。利用扫描电镜（SEM）和傅里叶变换红外（FT-IR）分析技术对复合PCM进行了表征。采用差示扫描量热法（DSC）分析了复合PCM的热性能和热可靠性。CA-MA共晶混合物可以在VMT的孔隙中保留20% wt%，而不会从复合材料中渗出熔化的PCM，因此，这种混合物被描述为形式稳定的复合PCM。热循环试验表明，经过3000次融/冻循环，稳定型复合材料PCM具有良好的热可靠性和化学稳定性。通过在复合材料中引入2 wt%的膨胀石墨（EG），可使形成稳定的CA MA/VMT复合材料的导热系数提高约85%。通过比较CA MA/VMT复合材料与CA MA/VMT/EG复合材料的融化和冻结次数，证实了导热系数的增加。含EG的形式稳定型PCM由于其良好的热性能、热化学可靠性和导热性，可作为吸能建筑材料，如石膏轻骨料、混凝土化合物、止火砂浆、墙板或空心砖内填料的组成部分。(c) 2008 Elsevier Ltd.版权所有。
Phase change materials (PCMs) can be incorporated with building materials to obtain novel form-stable composite PCM which has effective energy storage performance in latent heat thermal energy storage (LHTES) systems. In this study, capric acid (CA) myristic acid (MA) eutectic mixture/vermiculite (VMT) composite Was prepared as a novel form-stable PCM using vacuum impregnation method. The composite PCM was characterized using scanning electron microscope (SEM) and Fourier transformation infrared (FT-IR) analysis technique. Thermal properties and thermal reliability of the composite PCM were determined by differential scanning calorimetry (DSC) analysis. The CA-MA eutectic mixture Could be retained by 20 wt% into pores of the VMT without melted PCM seepage from the composite and therefore, this mixture was described as form-stable composite PCM. Thermal cycling test showed that the form-stable composite PCM has good thermal reliability and chemical stability although it was subjected to 3000 melting/freezing cycling. Thermal Conductivity of the form-stable CA MA/VMT composite PCM was increased by about 85% by introducing 2 wt% expanded graphite (EG) into the composite. The increase in thermal conductivity was confirmed by comparison of the melting and freezing times of the CA MA/VMT composite with that of CA MA/VMT/EG composite. The form-stable PCM including EG can be used as energy absorbing building material such as lightweight aggregate for plaster, concrete compounds, fire stop mortar, and component of interior fill for wall-boards or hollow bricks because of its good thermal properties, thermal and chemical reliability and thermal conductivity. (c) 2008 Elsevier Ltd. All rights reserved.