Synthesis and characterization of lauric acid/expanded vermiculite as form-stabilized thermal energy storage materials

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• 作者：Ruilong Wen^a ; ^{wenruilong123@126.com" class="auth_mail" title="E-mail the corresponding author} ; Zhaohui Huang^a ; ^{huang118@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yaoting Huang^b ; ^{huangyt8829@163.com" class="auth_mail" title="E-mail the corresponding author} ; Xiaoguang Zhang^a ; ^{xgzhang521@yeah.net" class="auth_mail" title="E-mail the corresponding author} ; Xin Min^a ; ^{minxin4686@126.com" class="auth_mail" title="E-mail the corresponding author} ; Minghao Fang^a ; ^{fmh@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yan&rsquo ; gai Liu^a ; ^{liuyang@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Xiaowen Wu^a ; ^{xwwu@cugb.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lauric acid ; Expanded vermiculite ; Form-stable composite material ; Thermal properties ; Thermal reliable ; Thermal conductivity
• 刊名：Energy & Buildings
• 出版年：2016
• 出版时间：15 March 2016
• 年：2016
• 卷：116
• 期：Complete
• 页码：677-683
• 全文大小：2246 K

文摘

Lauric acid(LA)/expanded vermiculite (EVM) form-stable phase change materials were synthesized via vacuum impregnation method. In the composites, lauric acid was utilized as a thermal energy storage material and the expanded vermiculite behaved as the supporting material. XRD and FT-IR results demonstrate that lauric acid and expanded vermiculite in the composite do not undergo a chemical reaction and only undergo a physical combination. Microstructural analysis indicates that lauric acid is sufficiently absorbed in the expanded vermiculite porous network, while displaying negligible leakage even under the molten state. According to DSC results, the 70 wt.% LA/EVM sample melts at 41.88 °C with a latent heat of 126.8 J/g and solidifies at 39.89 °C with a latent heat of 125.6 J/g. Thermal cycling measurements show that the form-stable composite PCM has adequate stability even after being subjected to 200 melting/freezing cycles. Furthermore, the thermal conductivity of the composite PCM increased by approximately 78% with the addition of 10 wt.% expanded graphite (EG). Thus, the form-stable composite PCM is a suitable option for thermal energy storage for building and solar heating system applications.