Energy Storage Science and Technology ›› 2017, Vol. 6 ›› Issue (4): 688-695.doi: 10.12028/j.issn.2095-4239.2017.0079

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Ceramic-salt based composites for thermal energy storage

NAVARRO Maria Elena1, PALACIOS Anabel1, HUGHES Tomos1, CONNOLLY Chloe1, UPPAL Harkiran1, CONG Lin1, LEI Xianzhang2, QIAO Geng1,2, LENG Guanghui1, DING Yulong1   

  1. 1School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK; 2Global Energy Interconnection Research Institute Europe GmbH, Berlin 10117, Germany
  • Received:2017-05-29 Revised:2017-06-21 Online:2017-07-01 Published:2017-07-01
  • Contact: NAVARRO M E(1979—),female, research fellow, research in thermal energy storage, E-mail: h.navarro@bham.ac.uk.
  • Supported by:
    Global Energy Interconnetion Research Institute Europe GmbH (SGRI-DL-71-16-018), The National Natural Scierce Fund (21406243).

Abstract: This paper reports a study on ceramic based phase change materials (PCM). Sodium nitrate (NaNO3) was used as the PCM, magnesium oxide (MgO) as the ceramic matrix, and different types of carbon materials as the thermal conductivity enhancers (TCE). The composites were fabricated by mixing, compaction, and sintering. The effect of carbon material addition was studied and the morphological and thermophysical properties of the composites were characterized. The results showed that the addition of the TCE could either hinder or enhance the thermal diffusivity of the composites, depending on the type of TCE used. It was found that the thermal energy storage density increased with increasing PCM concentration in the composite. All the composites manufactured were found to be thermally stable up to 500 ℃.

Key words: thermal energy storage, phase change material, composites, thermal conductivity enhancer