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Chinese Journal of Materials Research  2015, Vol. 29 Issue (4): 262-268    DOI: 10.11901/1005.3093.2014.148
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Preparation and Performance of a Phase Change Heat Storage Composite of Paraffin/Different Particle Sized Expanded Graphite
Yunfeng TIAN,Zhen LI(),Yang WANG,Ping ZENG,Lingyi JIANG
Faculty of Material Science and Chemistry, China University of Geosciences, Wuhan 430074, China
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Yunfeng TIAN,Zhen LI,Yang WANG,Ping ZENG,Lingyi JIANG. Preparation and Performance of a Phase Change Heat Storage Composite of Paraffin/Different Particle Sized Expanded Graphite. Chinese Journal of Materials Research, 2015, 29(4): 262-268.

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Abstract  

As phase change heat storage material (PCM), composites of paraffin/expanded graphite of different particle sizes (DPS-EG) were prepared by melt blending method, which were then characterized by means of XRD, FT-IR, SEM, DSC and LFA. The effect of mass fraction of DPS-EG on performance of the composite PCM was studied. Results show that the thermal diffusivity of the composite PCM increased first and then decreased with the increasing mass fraction of small particle sized EG. When the ratio of mass fraction for large sized ones to the small ones of the DPS-EG was 9:1, paraffin may be allowed to fill fully into the free space of the mosaic structure of DPS-EG. The thermal diffusivity of the composite PCM was up to 1.964×10-6 m2/s, 22 times higher than that of pure paraffin, while its latent heat was 144.2 J/g.
Key words:  composite materials      expanded graphite with different particle sizes      paraffin      mosaic structure      phase change heat storage material     
Received:  31 March 2014     
Fund: *Supported by National Undergraduate Innovative Training Project No. 201310491014.
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Yunfeng TIAN
Zhen LI
Yang WANG
Ping ZENG
Lingyi JIANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.148     OR     https://www.cjmr.org/EN/Y2015/V29/I4/262

Fig.1  Preparation process diagram of EG / paraffin composite PCMs
Sample PC-0 PC-1 PC-3 PC-5 PC-7 PC-10
EG-1 (<80 mesh) 10% 9% 7% 5% 3% 0
EG-2 (>200 mesh) 0 1% 3% 5% 7% 10%
Table 1  Mass ratio of EG-1 and EG-2
Fig.2  XRD spectra of EG-1 (a) and EG-2 (b)
Fig.3  SEM images of EG-1 (a) and EG-2 (b)
Fig.4  XRD spectra of EG, paraffin and composite PCMs
Fig.5  FTIR spectra of paraffin, EG and composite PCMs
Fig.6  SEM images of composite PCMs, (a, b) PC-0, (c, d) PC-1, (e, f) PC-10
Fig.7  Adsorption property of composite PCMs, (a) PC-0, (b) PC-1, (c) PC-3, (d) PC-5, (e) PC-7, (f) PC-10
Fig.8  Thermal diffusivity of paraffin and composite PCMs
Fig.9  DSC curves of paraffin and composite PCMs
Sample Latent heat/(J/g) Solid-solid Tm/℃ Solid-liquid Tm/℃
Paraffin 160.5 35.15 51.32
PC-10 144.8 35.04 50.95
PC-1 144.2 36.59 51.45
PC-0 145.2 35.01 50.41
Table 2  Latent heats and phase change temperatures (Tm) of paraffin and composite PCMs
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