Probing cycle stability and reversibility in thermochemical energy storage – CaC2O4·H2O as perfect match?

Christian Knoll, Danny Müller, Werner Artner, Jan M. Welch, Andreas Werner, Michael Harasek and Peter Weinberger

Applied Energy, 2017, vol. 187, issue C, 9 pages

Abstract: The dehydration and subsequent rehydration of calcium oxalate monohydrate has yet to find application in thermochemical energy storage. Unlike for many other salt hydrates, complete reversibility of the dehydration-rehydration reaction was observed. Additionally, it was found that the rehydration temperature is strongly affected by the water vapour concentration: Full reversibility is not only achieved at room-temperature, but, depending on the water vapour concentration, at up to 200°C. This allows isothermal switching of the material between charging and discharging by a change of the H2O-partial pressure. Cycle stability of the material was tested by a long-term stress experiment involving 100 charging and discharging cycles. No signs of material fatigue or reactivity loss were found. In-situ powder X-ray diffraction showed complete rehydration of the material within 300s. The experimental findings indicate that the CaC2O4·H2O/CaC2O4 system is perfectly suited for technical application as a thermochemical energy storage medium.

Keywords: Calcium oxalate monohydrate; Full reversibility; Cycle stability; Water vapour concentration; Chemical heat pump; Thermochemical energy storage (search for similar items in EconPapers)
Date: 2017
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Citations: View citations in EconPapers (6)

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DOI: 10.1016/j.apenergy.2016.11.053

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