scholarly journals Preparation and Characterization of Lauric–Myristic Acid/Expanded Graphite as Composite Phase Change Energy Storage Material

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Dongyi Zhou ◽  
Jiawei Yuan ◽  
Xianghua Xiao ◽  
Yicai Liu
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Myristic Acid ◽  
Physical Adsorption ◽  
Eutectic Mixture ◽  
Conductivity Measurement ◽  
Expanded Graphite ◽  
Point Temperature ◽  
Fusion Point ◽  
Binary Eutectic

Lauric acid (LA) and myristic acid (MA) were used to prepare a binary eutectic mixture. The expanded graphite (EG) was used as the carrier, and the lauric–myristic acid/expanded graphite (LA–MA/EG) composite phase change material was prepared by physical adsorption method. The microstructure, chemical structure, and thermal properties of LA–MA/EG were characterized by scanning electron microscopy (SEM), differential scanning calorimeter (DSC), Fourier transform infrared spectroscopy (FTIR), and thermal conductivity measurement. The experimental results have shown that the maximum mass ratio of the binary eutectic mixture in the LA–MA/EG composite phase change energy-storing material was 92.2%, and there was physical mixing and has no chemical reaction between LA–MA and EG. The fusion point temperature of LA–MA/EG was 33.4°C, the solidification point temperature was 33.8°C, and the latent heat was 171.1 J/g, which was suitable for building energy storage field. After several thermal cycles, the change of the fusion point and potential heat of the composite phase change materials were very small, and it still has good energy storage performance.

Preparation and Thermal Properties of Stearic Acid/n‐Octadecane Binary Eutectic Mixture as Phase Change Materials for Energy Storage

2019 ◽  
Vol 4 (14) ◽  
pp. 4125-4130 ◽  
Author(s):  
Jianfen Shen ◽  
Zhanjiang Hu ◽  
Chaoming Wang ◽  
Ke Chen ◽  
Zhengyu Cai ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Energy Storage ◽  
Stearic Acid ◽  
Phase Change ◽  
Phase Change Materials ◽  
Eutectic Mixture ◽  
Binary Eutectic

scholarly journals Preparation and Performance of Capric-Myristic Acid Binary Eutectic Mixtures for Latent Heat Thermal Energy Storages

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Dongyi Zhou ◽  
Yuhong Zhou ◽  
Yicai Liu ◽  
Xianzhi Luo ◽  
Jiawei Yuan
Keyword(s):  
Thermal Stability ◽  
Low Temperature ◽  
Phase Change ◽  
Latent Heat ◽  
Thermal Energy ◽  
Myristic Acid ◽  
Eutectic Mixture ◽  
Gravimetric Analysis ◽  
Binary Eutectic

The capric-myristic acid (CA-MA) binary eutectic mixture phase change material (PCM) was prepared for low-temperature latent heat thermal energy storage (LHTES). The thermal properties, thermal stability, and long-term cycling reliability of the PCMs were measured. Differential scanning calorimetry results showed that the CA-MA binary eutectic mixture at the mass ratio (72/28 wt%) indicated a high-performance PCM for its suitable phase change temperature (Tm: 18.21°C, Tf: 17.40°C) and high latent heat (Hm: 148.5 J/g, Hf: 134.0 J/g). Thermal gravimetric analysis results indicated that the CA-MA binary eutectic mixture had excellent thermal stability in its operating temperature range. The thermal cycling tests and Fourier transform infrared spectroscopy results revealed that the CA-MA binary eutectic mixture had good long-term cycling thermal chemical reliability. In summary, in terms of thermal property, thermal stability, and reliability, the prepared CA-MA PCM could be applied particularly for low-temperature LHTES systems and backfill materials of ground source heat pump systems.

scholarly journals Palmitic Acid-Stearic Acid/Expanded Graphite as Form-Stable Composite Phase-Change Material for Latent Heat Thermal Energy Storage

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Dongyi Zhou ◽  
Yuhong Zhou ◽  
Jiawei Yuan ◽  
Yicai Liu
Keyword(s):  
Stearic Acid ◽  
Palmitic Acid ◽  
Phase Change ◽  
Latent Heat ◽  
Thermal Energy ◽  
Eutectic Mixture ◽  
Expanded Graphite ◽  
The Novel ◽  
Binary Eutectic ◽  
Change Material

The aim of this study is to prepare a novel form-stable phase-change material (PCM), palmitic acid-stearic acid/expanded graphite (PA-SA/EG) PCM, for latent heat thermal energy. A eutectic mixture of palmitic acid and stearic acid is incorporated with expanded graphite (EG). The thermal properties and microstructure of the novel PCMs were studied. The optimal mass ratio of PA-SA in composite PCM is approximately 92.8%. DSC results showed that the novel PCMs had suitable phase-change temperature (Tm: 55.18°C, Tf: 54.91°C) and high latent heat (Hm: 176.2 J/g, Hf: 175.6 J/g), and good thermal performance was maintained after 1500 times thermal cycling. The PA-SA binary eutectic mixture was uniformly distributed in the porous structure of EG, and the PCM did not leak even in molten state. EG had little effect on the thermal properties of the PA-SA binary eutectic mixture and remarkably improved the thermal conductivity of the composite PCMs. TGA test indicated that the composite PCM had nice thermostability in the range of operating temperature. Based on all these results, the PA-SA/EG composite PCM is a promising material for low-temperature thermal energy storage applications.

scholarly journals Preparation and Properties of Capric–Myristic Acid/Expanded Graphite Composite Phase Change Materials for Latent Heat Thermal Energy Storage

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2462
Author(s):  
Dongyi Zhou ◽  
Jiawei Yuan ◽  
Yuhong Zhou ◽  
Yicai Liu
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Phase Change Material ◽  
Latent Heat ◽  
Heat Pump ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Myristic Acid ◽  
Expanded Graphite ◽  
Change Material

A novel composite phase change material (CPCM), capric–myristic acid/expanded graphite (CA–MA/EG) CPCM, was prepared by absorbing liquid CA–MA (as the phase change material (PCM)) into EG (as the substrate material) for heat storage in the backfill materials of soil-source heat pump systems. The thermal characteristics and microstructure of the novel CPCM were analyzed using differential scanning calorimetry (DSC) and scanning electronic microscopy (SEM). The thermal conductivities of CA–MA/EG CPCM were surveyed. The thermal stability of the CA–MA/EG was analyzed using thermogravimetric analysis (TGA) and thermal cycle tests. The results showed that the optimal mass content of CA–MA in CPCM was approximately 92.4% and the CA–MA was uniformly distributed in the vesicular structure of EG; the CA–MA/EG CPCM had an appropriate phase change temperature (Tm: 19.78 °C, Tf: 18.85 °C), high latent heat (Hm: 137.3 J/g, Hf: 139.9 J/g), and excellent thermostability and thermal reliability. The thermal conductivity of the CPCM was remarkably enhanced after adding EG. Therefore, the CPCMs demonstrated outstanding thermal performance and can be utilized in low-temperature latent heat thermal energy storage (LHTES) systems, such as soil-source heat pump systems.

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