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

by Dongyi Zhou 1,2,3, Jiawei Yuan 2, Yuhong Zhou 2 and Yicai Liu 1,*
1
School of Energy Science and Engineering, Central South University, Changsha 410083, China
2
School of Mechanical and Energy Engineering, Shaoyang University, Shaoyang 422000, China
3
Key Laboratory of Hunan Province for Efficient Power System and Intelligent Manufacturing, Shaoyang University, Shaoyang 422000, China
*
Author to whom correspondence should be addressed.
Energies 2020, 13(10), 2462; https://doi.org/10.3390/en13102462
Received: 9 April 2020 / Revised: 1 May 2020 / Accepted: 6 May 2020 / Published: 14 May 2020
(This article belongs to the Section Energy Storage and Application)
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. View Full-Text
Keywords: fatty acids; expanded graphite; thermal properties; thermal energy storage; phase change materials fatty acids; expanded graphite; thermal properties; thermal energy storage; phase change materials
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MDPI and ACS Style

Zhou, D.; Yuan, J.; Zhou, Y.; Liu, Y. Preparation and Properties of Capric–Myristic Acid/Expanded Graphite Composite Phase Change Materials for Latent Heat Thermal Energy Storage. Energies 2020, 13, 2462.

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