scholarly journals High Anisotropic Thermal Conductivity, Long Durability Form-Stable Phase Change Composite Enhanced by a Carbon Fiber Network Structure

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 230
Author(s):  
Kaixin Dong ◽  
Nan Sheng ◽  
Deqiu Zou ◽  
Cheng Wang ◽  
Xuemei Yi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
Phase Change ◽  
Network Structure ◽  
Heat Storage ◽  
High Thermal Conductivity ◽  
Paraffin Wax ◽  
Stable Phase ◽  
Impregnation Method ◽  
Fiber Network

To address the drawback of low thermal conductivity of conventional organic phase change materials (PCMs), a paraffin-wax-based phase change composite (PCC) was assembled via a vacuum impregnation method, using a new type of carbon fiber network material as the supporting matrix. The carbon fiber sheet (CFS) material exhibited a network structure comprising high-thermal-conductivity carbon fibers, beneficial for enhancing the heat transfer properties of the PCC. The sheet-shaped carbon fiber material was stacked and compressed, and then impregnated with the liquid paraffin wax PCM to form the composite. The thermal conductivity, durability, shape stability, chemical stability, and heat storage characteristics of the PCC specimen were carefully analyzed. The maximum thermal conductivity of the PCC was 11.68 W·m−1·K−1 (4670% compared to that of pure paraffin) in the radial direction, and 0.93 W·m−1·K−1 in the axial direction of the sample, with 17.44 vol % of added CFS. The thermal conductivity retention rate after 200 thermal cycles was 78.6%. The PCC also displayed good stability in terms of chemical structure, shape, and heat storage ability. This study offers insights and a possible strategy for the development of anisotropic high-thermal-conductivity PCCs for potential applications in latent heat storage systems.

scholarly journals High thermal conductivity phase change composite with a metal-stabilized carbon-fiber network

2016 ◽  
Vol 179 ◽  
pp. 1-6 ◽  
Author(s):  
Takahiro Nomura ◽  
Chunyu Zhu ◽  
Sheng Nan ◽  
Kazuki Tabuchi ◽  
Shuangfeng Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
Phase Change ◽  
High Thermal Conductivity ◽  
Fiber Network

scholarly journals High thermal conductivity phase change composite with percolating carbon fiber network

2015 ◽  
Vol 154 ◽  
pp. 678-685 ◽  
Author(s):  
Takahiro Nomura ◽  
Kazuki Tabuchi ◽  
Chunyu Zhu ◽  
Nan Sheng ◽  
Shuangfeng Wang ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Fiber ◽  
Phase Change ◽  
High Thermal Conductivity ◽  
Fiber Network

Lauric acid/bentonite/flake graphite composite as form-stable phase change materials for thermal energy storage

2020 ◽  
Vol 10 (2) ◽  
pp. 214-224 ◽  
Author(s):  
Songyang Liu ◽  
Jie Han ◽  
Qingjie Gao ◽  
Wenze Kang ◽  
Ruichen Ren ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Lauric Acid ◽  
Stable Phase ◽  
Impregnation Method ◽  
Flake Graphite ◽  
Graphite Composite

The main purpose of this paper was to synthesize a novel form-stable composite phase change material (PCM). Herein, bentonite-based PCMs were synthesized by impregnating Na-bentonite clay with lauric acid (LA) through a vacuum impregnation method. Flake graphite (FG) was used to enhance the thermal conductivity of the composite PCMs. In addition, FG also helped block the leakage of the PCMs. It is worth noting that with the addition of FG, the period of melting and solidifying of composite PCMs were decreased to some extent. Meanwhile, the thermal conductivity of the PCMs has been obviously improved. Moreover, the synthesized composite PCM exhibited a favorable performance of reliability after 200 thermocycling test. Hence, this study showed that the developed composite PCM has the potential to be applied in thermal energy storage systems.

Novel PEG/EP form-stable phase change materials with high thermal conductivity enhanced by 3D ceramics network

2020 ◽  
Vol 46 (16) ◽  
pp. 25285-25292
Author(s):  
Binyong Wu ◽  
Dong Lao ◽  
Renli Fu ◽  
Xinqing Su ◽  
Houbao Liu ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Phase Change Materials ◽  
High Thermal Conductivity ◽  
Stable Phase

scholarly journals Thermal Conductivity Enhancement of Iraqi Origin Paraffin Wax by Nano-Alumina

2017 ◽  
Vol 13 (3) ◽  
pp. 83-90 ◽  
Author(s):  
Miqdam T. Chaichan ◽  
Rasha Mohammed Hussein ◽  
Aida Mohammed Jawad
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Latent Heat ◽  
Heat Storage ◽  
Thermal Storage ◽  
Paraffin Wax ◽  
Al2o3 Nanoparticles ◽  
Conductivity Enhancement ◽  
Nano Alumina ◽  
Change Material

Abstract   Paraffin wax is utilized for the heat storage applications taking advantage from the high stored latent heat during the phase change (from solid to fluid) period. What isn't right with this procedure is that the wax has a little heat transfer rate because of its low thermal conductivity. The thermal conductivity improvement of the paraffin wax has been examined utilizing nano-material with high thermal conductivity. In the recent study, (Al2O3) nanoparticles with weights of 1, 2, and 3% of the paraffin wax were added to the paraffin wax. The Iraqi paraffin wax accessible at the local markets was utilized as a phase change material (PCM). Many properties of the wax were changed due to the addition of nanofillers. The wax color was changed from light brown to white. The thermal conductivity of the paraffin wax was expanded by increasing the additional nanoparticles extent with 37.1, 42.3 and 60.32% for 1, 2 and 3% added nano-Al2O3 compared to pure wax conditions. The subsequent change in the thermal conductivity of the paraffin wax makes it reasonable for the use in thermal storage applications.   Keywords: Latent heat, Nano-alumina, Paraffin wax, Thermal storage,

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