Analysis of a coupled calcium oxide-potassium carbonate salt hydrate based thermochemical energy storage system

Akshay Chate, S. Srinivasa Murthy and Pradip Dutta

Energy, 2024, vol. 313, issue C

Abstract: A coupled thermochemical energy storage (TCES) system consisting of calcium oxide (for high temperature storage) and potassium carbonate salt hydrate (for medium temperature storage) is analyzed for long-term high temperature heat storage. The coupled TCES system is expected to have smaller volume requirement as evaporator and condenser of the conventional TCES system are replaced by a second reactor. The rate expressions for hydration-dehydration reactions of both storage materials are modified to calculate the reaction completion times, which provide the rate limiting process. A thermodynamic analysis is carried out for the operating cycle of the coupled TCES system to study the impact of operating parameters on the system performance. It is observed that the charging temperature of the individual storage material has significant impact on the performance of the coupled TCES system. The analysis reveals that the coupled TCES system with optimized parameters operating in a cold ambient at 10 °C, achieves a cycle efficiency of 58.6 %, exergy efficiency of 49.1 %, specific heating power of 127.8 W kg−1 and volumetric energy storage density of 269.0 kWh m−3.

Keywords: Coupled thermochemical energy storage system; Thermodynamic analysis; Calcium oxide; Potassium carbonate salt hydrate; Heating in cold climates (search for similar items in EconPapers)
Date: 2024
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:313:y:2024:i:c:s0360544224038453

DOI: 10.1016/j.energy.2024.134067

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