High Thermal Conductivity of Carboxyl‐rich Carbon/Polyethylene glycol Composites for Enhanced Photothermal Conversion and Latent Heat Storage

2021 ◽  
Author(s):  
Huizhi Yang ◽  
Yufeng Bai ◽  
Chunhua Ge ◽  
Shangyu Li ◽  
Xiangdong Zhang
Keyword(s):  
Thermal Conductivity ◽  
Polyethylene Glycol ◽  
Latent Heat ◽  
Heat Storage ◽  
High Thermal Conductivity ◽  
Latent Heat Storage ◽  
Photothermal Conversion

Thermal Conductivity Enhancement in a Latent Heat Storage Device

2013 ◽  
Vol 860-863 ◽  
pp. 590-593
Author(s):  
Cha Xiu Guo ◽  
Ding Bao Wang ◽  
Gao Lin Hu
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Solid State ◽  
Liquid Phase ◽  
Phase Change ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage Device ◽  
Latent Heat Storage ◽  
Conductivity Enhancement

High conductivity porosity materials are proposed to enhance the phase change materials (PCM) in order to solve the problem of low conductivity of PCM in the latent heat storage device (LHSD), and two-dimensional numerical simulation is conducted to predict the performance of the PCM by CFD software. During the phase change process, the PCM is heated from the solid state to the liquid phase in the process of melting and from the liquid phase to the solid state in the solidification process. The results show that porosity materials can improve heat transfer rate effectively, but the effect of heat transfer of Al foam is superior to that of graphite foam although the heat storage capacity is almost the same for both. The heat transfer is enhanced and the solidification time of PCM is decreased since the effective thermal conductivity of composite PCM is increased.

scholarly journals Thermal Conductivity and Density Evaluation of Nanosuspension as Latent Heat Storage Material

Netsu Bussei ◽  
2019 ◽  
Vol 33 (4) ◽  
pp. 151-158
Author(s):  
Shin-ichi Morita ◽  
Fumiya Irie ◽  
Katsuma Hirano ◽  
Yasutaka Hayamizu ◽  
Takanobu Yamada ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Latent Heat ◽  
Heat Storage ◽  
Storage Material ◽  
Latent Heat Storage ◽  
Heat Storage Material ◽  
Density Evaluation

Thermal properties of nano-sized polyethylene glycol confined in silica gels for latent heat storage

2017 ◽  
Vol 655 ◽  
pp. 211-218 ◽  
Author(s):  
Fang Tian ◽  
Shiqi Zhang ◽  
Min Zhai ◽  
Jian Sui ◽  
Xiaozheng Lan ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Polyethylene Glycol ◽  
Latent Heat ◽  
Heat Storage ◽  
Silica Gels ◽  
Latent Heat Storage

Applications of Nanocomposite-Enhanced Phase-Change Materials for Heat Storage

2017 ◽  
Vol 891 ◽  
pp. 509-515
Author(s):  
Jaroslav Jerz ◽  
Peter Tobolka ◽  
Martin Nosko ◽  
Tomáš Dvorák
Keyword(s):  
Thermal Conductivity ◽  
Phase Change ◽  
Latent Heat ◽  
Phase Change Materials ◽  
Heat Storage ◽  
Low Cost ◽  
Utilization Efficiency ◽  
Fibrous Materials ◽  
Solar Thermal Energy ◽  
Latent Heat Storage

The development of efficient materials for heat storage has become recently a popular research topic as amount of energy gained from solar power depends significantly on day and night cycle. That's why the right choice of material for heat storage directly affects the utilization efficiency of solar thermal energy. Research on heat storage materials nowadays focuses on phase change materials (PCMs) enabling repeatedly utilize the latent heat of the phase transition between the solid and liquid phase. Most currently used PCMs have low thermal conductivity, which prevents them from overcoming problem of rapid load changes in the charging and discharging processes. To overcome this obstacle and to obtain excellent heat storage possibility, various techniques have been proposed for enhancing the thermal conductivity of PCMs, such as adding metallic or nonmetallic particles, in-corporating of porous or expanded materials, fibrous materials, macro-, micro-, or nanocapsules, etc.The authors of this study report particularly the huge potential of oxide nanoadditives, such as titania (TiO2), alumina (Al2O3), silica (SiO2) and zinc oxide (ZnO), that are even in small quantities (up to 3 wt.%) able significantly to enhance the heat storage characteristics of conventional PCMs. Moreover, the microstructure of the granules produced by recycling of aluminum scrap refers to the possibility of their utilizing for the purpose of low cost solutions enabling to increase the thermal conductivity of PCMs. The above mentioned technical solutions are therefore the important keys to successful commercialization of materials for latent heat storage in future building industry.

scholarly journals Improvement the performance of composite PCM paraffin-based incorporate with volcanic ash as heat storage for low-temperature application

2021 ◽  
pp. 53-61
Author(s):  
Dwi Rahmalina ◽  
Dwi Chandra Adhitya ◽  
Reza Abdu Rahman ◽  
Ismail Ismail
Keyword(s):  
Thermal Conductivity ◽  
Melting Temperature ◽  
Latent Heat ◽  
Large Scale ◽  
Heat Storage ◽  
Heat Of Fusion ◽  
Latent Heat Storage ◽  
Conductivity Enhancement ◽  
Water Heaters ◽  
Supercooling Degree

Paraffin is well known thermal energy storage with the high latent heat of fusion. Unfortunately, low thermal conductivity and low melting temperature inhibit large-scale applications for lower temperature applications like solar water heaters and desalination. The addition of high thermal conductivity material can increase the thermal conductivity of paraffin and increase the melting temperature of paraffin. In this study, a new approach is taken by using volcanic sand as thermal conductivity enhancement material. The properties of the sand are examined. The chemical composition of the sand is dominated by Fe (51.23 %), Fe2O3 (23.24 %) and SiO2 (11 %), which are known as good thermal conductivity materials. Six different compositions of paraffin/sand (weight ration) are tested to observe the melting and vapor temperature of the composite. Adding sand (with granule size of 44 µm) by 30 wt % can accelerate the charging rate by 25 % compared to pure paraffin, where the discharging rate is increased significantly by 17.8 %. The supercooling degree of the composite is only 1 °C, where pure paraffin has a supercooling degree by 8 °C. The charging and discharging characteristics for each sample are discussed in detail within the article. Overall, the addition of volcanic sand improves paraffin's charging and discharging rate, reducing the supercooling degree and can be considered a convenient method to improve the paraffin performance as latent heat storage

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