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Investigation on Long Term Operation of Thermochemical Heat Storage with MgO-Based Composite Honeycombs

Author

Listed:
  • Jae Yong Lee

    (Energy Network Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea)

  • Taesu Yim

    (Energy Network Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea)

  • Hyouck Ju Kim

    (Energy Network Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea)

  • Sungkook Hong

    (Energy Network Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea)

  • Doo Won Seo

    (Energy Materials Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea)

  • Hong Soo Kim

    (Energy Materials Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea)

Abstract

The efficient storing and utilizing of industrial waste heat can contribute to the reduction of CO 2 and primary energy. Thermochemical heat storage uses a chemical and/or an adsorption-desorption reaction to store heat without heat loss. This study aims to assess the long-term operational feasibility of thermochemical material based composite honeycombs, so that a new thermochemical heat storage and peripheral system were prepared. The evaluation was done by three aspects: The compressive strength of the honeycomb, heat charging, and the discharging capabilities of the thermochemical heat storage. The compressive strength exceeded 1 MPa and is sufficient for safe use. The thermal performance was also assessed in a variety of ways during 100 cycles, 550 h in total. By introducing a new process, the amount of thermochemical-only charging was successfully measured for the first time. Furthermore, the heat charging capabilities were measured at 55.8% after the end of the experiment. Finally, the heat discharging capability was decreased until 60 cycles and there was no further degradation thereafter. This degradation was caused by charging at a too high temperature (550 °C). In comparative tests using a low temperature (450 °C), the performance degradation became slow, which means that it is important to find the optimal charging temperature.

Suggested Citation

  • Jae Yong Lee & Taesu Yim & Hyouck Ju Kim & Sungkook Hong & Doo Won Seo & Hong Soo Kim, 2019. "Investigation on Long Term Operation of Thermochemical Heat Storage with MgO-Based Composite Honeycombs," Energies, MDPI, vol. 12(7), pages 1-18, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:7:p:1262-:d:219164
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    References listed on IDEAS

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    1. Shkatulov, Alexandr & Ryu, Junichi & Kato, Yukitaka & Aristov, Yury, 2012. "Composite material “Mg(OH)2/vermiculite”: A promising new candidate for storage of middle temperature heat," Energy, Elsevier, vol. 44(1), pages 1028-1034.
    2. Mastronardo, E. & Bonaccorsi, L. & Kato, Y. & Piperopoulos, E. & Lanza, M. & Milone, C., 2016. "Thermochemical performance of carbon nanotubes based hybrid materials for MgO/H2O/Mg(OH)2 chemical heat pumps," Applied Energy, Elsevier, vol. 181(C), pages 232-243.
    3. Schmidt, Matthias & Linder, Marc, 2017. "Power generation based on the Ca(OH)2/ CaO thermochemical storage system – Experimental investigation of discharge operation modes in lab scale and corresponding conceptual process design," Applied Energy, Elsevier, vol. 203(C), pages 594-607.
    4. Yan, J. & Zhao, C.Y., 2016. "Experimental study of CaO/Ca(OH)2 in a fixed-bed reactor for thermochemical heat storage," Applied Energy, Elsevier, vol. 175(C), pages 277-284.
    5. Taesu Yim & Hong Soo Kim & Jae Yong Lee, 2018. "Cyclic Assessment of Magnesium Oxide with Additives as a Thermochemical Material to Improve the Mechanical Strength and Chemical Reaction," Energies, MDPI, vol. 11(9), pages 1-15, September.
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