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Here as well, an influence of the heat conductivity of the material cannot be clearly seen, as copper and graphite seem to enhance the reactivity of the sample, but the sand composite, surprisingly, shows highest reactivity, possibly due to a more porous structure of the composite sample compared to the other materials. CYCLING STABILITY AND CYCLE EFFICIENCY MgCl2 * 6 H2O is known to develop a gel-like structure due to overhydration, which hinders further water uptake, leading to a possibly reversible decrease of the reactivity of the TCM. Furthermore, thermal decomposition could lead to an irreversible loss in reactivity. We decided to investigate cycling stability of the zeolite composite in comparison to pure MgCl2 * 6 H2O closer, as the zeolite composite, compared to the other samples, seems to enhance the characteristics of the sample in such a way, that the third dehydration step (step III), during which a beginning thermal decomposition is likely to take place, is occurring at higher temperatures compared to the other samples, whereas peak temperatures of step I and II are similar to those of the other composites and the heat fluxes obtained are comparable to pure MgCl2 * 6 H2O. During cycling, both materials show a linear decrease of the amount of heat generated during rehydration (Figure 7). After 25 cycles, MgCl2 * 6 H2O has a 40% lower heat output during hydration compared to the first cycle. The 26th, 27th cycle and 28th cycle show a sudden drop by another 10%. The reactivity of the sample was recovered to 80% after grounding using mortar and pestle, indicating that overhydration plays the major role in the decrease of reactivity of MgCl2 * 6 H2O. Figure 7: Decrease in reactivity of MgCl2 * 6 H2O and a zeolite composite, respectively, during subsequent hydration/dehydration cycles. The amount of heat released during hydration of the sample was measured.PDF Image | THERMOCHEMICAL STORAGE MATERIALS RESEARCH
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