Abstract
As an excellent adsorption material, Expanded graphite (EG) has large surface area and pore volume in micro morphology. Therefore, it is often used as the shape-stabilized material for liquid PCM. In the previous studies, the influence of the density and size of EG on the PCM was less studied. In this paper, the EG with different density and size is selected as the shape-stabilized material of PCM. In the experiment, modified calcium chloride hexahydrate composite PCM and EG with different sizes and densities were used for coupling. The experimental results show that the EG with density of 200 kg m−2 and the size of 50 mesh can better adsorb the PCM. The experiment uses a physical mixing method, and the operation steps are simple and easy to use in practice. The shape-stabilized PCM (ss-PCM) prepared with 50 mesh EG has higher latent heat value (104.21 J g−1) and lower undercooling (1.75 °C). At the end of this paper, the ss-PCM was tested by micro morphology, pore size and infrared spectroscopy. The experimental results showed that the EG and c-PCM were evenly coupled together. ss-PCM still show good stability after 30 thermal cycles and can be used in practical production.
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Abbreviations
- EG:
-
Expand graphite
- PCM:
-
Phase change material
- ss-PCM:
-
Shape-stabilized phase change material
- c-PCM:
-
Composite phase change material
- DSC:
-
Differential scanning calorimetry
- SEM:
-
Scanning electron microscope
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the General project of Guangxi Natural Science Foundation (2018GXNSFAA138157).
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Guangxi Natural Science Foundation (2018GXNSFAA138157)
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Luo, X., Cao, S., Hu, J. et al. Study on coupling of expanded graphite and modified calcium chloride hexahydrate phase change cold storage material. J Therm Anal Calorim 148, 10001–10009 (2023). https://doi.org/10.1007/s10973-023-12442-4
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DOI: https://doi.org/10.1007/s10973-023-12442-4