Thermal energy storage properties and thermal reliability of PEG/bone char composite as a form-stable phase change material

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Abstract

Bone char (BC) is a promising porous material that can be used for preparing a form-stable composite phase change material (PCM). In this paper, form-stable polyethylene glycol (PEG 6000)/BC composite PCMs were prepared by impregnation method. The PEG was used as the phase change material, and two different particle sizes of BC (0.8–1 mm: BC-1; 0.25–0.8 mm: BC-2) were acted as the supporting materials. The phase composition and chemical structure of the composite PCMs (PEG/BC-1 and PEG/BC-2) were characterized using X-ray diffraction and Fourier transformation infrared. The results indicated that the PEG can be well impregnated into BC pores with good compatibility. Thermal properties and thermal stability of the composite PCMs were determined by differential scanning calorimeter (DSC) and thermogravimetry analysis (TGA). DSC results showed that the maximum impregnation percentage for PEG into BC-1 and BC-2 was 38.77 and 43.91%, respectively, without melted PCM seepage from the composites. The TGA analysis revealed that the composite PCMs had good thermal stability above their working temperature range. The thermal cycle test of 100 melting–freezing cycles showed that the composite PCMs have good thermal reliability and chemical stability. The form-stable composite PCMs can be used as thermal energy storage material for waste heat storage and solar heating system.

Keywords

Bone char PEG Form-stable composite PCM Thermal energy storage 

Notes

Acknowledgements

We gratefully acknowledge the China Scholarship Council (CSC) for providing the opportunity to study at the University of Auckland, and the assistance from the group and department. This present work was supported by the National Natural Science Foundations of China (Grant Nos. 51472222, 51372232).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  • Ruilong Wen
    • 1
    • 3
  • Puqi Jia
    • 2
    • 3
  • Zhaohui Huang
    • 1
  • Minghao Fang
    • 1
  • Yangai Liu
    • 1
  • Xiaowen Wu
    • 1
  • Xin Min
    • 1
  • Wei Gao
    • 3
  1. 1.Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and TechnologyChina University of Geosciences (Beijing)BeijingChina
  2. 2.Department of Nonferrous Metallurgy, School of MetallurgyNortheastern UniversityShenyangChina
  3. 3.Department of Chemical and Materials EngineeringThe University of AucklandAucklandNew Zealand

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