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 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.

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