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

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2019
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Abstract
The efficient storing and utilizing of industrial waste heat can contribute to the reduction of CO2 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.
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Authors Lee, Jae Yong;Yim, Taesu;Kim, Hyouck Ju;Hong, Sungkook;Seo, Doo Won;Kim, Hong Soo;
Journal energies
Year 2019
DOI
DOI not found
URL
https://www.mdpi.com/1996-1073/12/7/1262
Keywords
Materials of engineering and construction. Mechanics of materials Engineering (General). Civil engineering (General) Biotechnology Technology Archaeology chemical engineering social sciences computer engineering. computer hardware mechanics of engineering. applied mechanics engineering design

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