Efficient Solar-to-Thermal Energy Conversion and Storage with High-Thermal-Conductivity and Form-Stabilized Phase Change Composite Based on Wood-Derived Scaffolds

被引:21
作者
Chen, Bolin [1 ]
Han, Meng [1 ]
Zhang, Bowei [1 ]
Ouyang, Gaoyuan [2 ]
Shafei, Behrouz [3 ]
Wang, Xinwei [1 ]
Hu, Shan [1 ]
机构
[1] Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
[3] Iowa State Univ, Dept Civil Construct & Environm Engn, Ames, IA 50011 USA
关键词
solar thermal energy; phase change material; thermal storage; thermal conductivity; carbonaceous material; carbon matrix composite; SHAPE-STABILIZATION; N-OCTADECANE; MICROCAPSULES;
D O I
10.3390/en12071283
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Solar-to-thermal energy conversion is one of the most efficient ways to harvest solar energy. In this study, a novel phase change composite with porous carbon monolith derived from natural wood is fabricated to harvest solar irradiation and store it as thermal energy. Organic phase change material n-octadecane is physically adsorbed inside the porous structure of the carbonized wood, and a thin graphite coating encapsulates the exterior of the wood structure to further prevent n-octadecane leakage. The carbonized wood scaffold and the graphite coating not only stabilize the form of the n-octadecane during phase change, but also enhance its thermal conductivity by 143% while retaining 87% of its latent heat. Under 1-sun irradiation, the composite achieves an apparent 97% solar-to-thermal conversion efficiency.
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页数:11
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