Carbon black nano particle loaded lauric acid-based form-stable phase change material with enhanced thermal conductivity and photo-thermal conversion for thermal energy storage

被引：114
作者：
Mishra, Amit Kumar [1 ]
Lahiri, B. B. [1 ]
Philip, John [1 ]
机构：
[1] Indira Gandhi Ctr Atom Res, Smart Mat Sect, Corros Sci & Technol Div, Met & Mat Grp,HBNI, Kalpakkam 603102, Tamil Nadu, India
来源：
ENERGY | 2020年 / 191卷
关键词：
Thermal conductivity enhancement; Phase change materials; Form-stable PCM; Thermal energy storage; Carbon black nano particle; Photo-thermal conversion; PARAFFIN/EXPANDED GRAPHITE COMPOSITE; LATENT-HEAT STORAGE; ELECTRICAL-CONDUCTIVITY; EUTECTIC MIXTURE; PERFORMANCE; MODEL; MICROENCAPSULATION; NANOCOMPOSITE; AGGREGATION; NANOTUBES;
D O I：
10.1016/j.energy.2019.116572
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
We report significantly high enhancements in thermal conductivity and photo-thermal conversion for lauric acid-based phase change material (PCM), loaded with carbon black nano particles (CBNP). Addition of 25 wt % calcium carbonate powder to the PCM is found to arrest the material leakage during solid-liquid phase transition and the form-stable PCM showed superior thermal and mechanical properties. Thermal conductivity enhanced by similar to 195% for the PCM loaded with 3.5 wt % of CBNP nano-inclusions, which is attributed to the development of interconnected percolation networks during solidification of the PCM. Superior volume filling capability and compressibility of CBNP nano-inclusions further augmented thermal conductivity enhancements in solid state. The micro-scale aggregation phenomena and the formation of quasi-2D percolation networks is observed in real time using timed stamped optical phase contrast video-microscopy. The similar to 134% enhancement in photo-thermal conversion is attributed to the augmentation of extinction efficiency of the incident radiation due to multiple scattering from the micro-sized CBNP clusters, within the PCM host matrix. The excellent photo-thermal efficiency, high thermal conductivity, low cost and enhanced form-stability of the CBNP loaded PCMs at elevated temperature make them economically attractive choice for latent heat thermal energy storage applications. (C) 2019 Elsevier Ltd. All rights reserved.
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页数：15
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