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

Jae Yong Lee, Taesu Yim, Hyouck Ju Kim, Sungkook Hong, Doo Won Seo and Hong Soo Kim
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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

Energies, 2019, vol. 12, issue 7, 1-18

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.

Keywords: thermochemical heat storage; thermochemical material; composite honeycombs; compressive strength of honeycombs; magnesium oxide; zeolite 13X (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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