Thermochemical Heat Storage Materials and their Solar Space Heating Application

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The study evaluates the efficiency of thermochemical heat storage materials, specifically salt hydrates like MgSO4, ZnSO4, and FeSO4, for solar energy storage. It highlights the high energy storage densities of MgSO4 and ZnSO4, with enthalpy values of 2256 J g-1 and 1731 J g-1, respectively. The research emphasizes the hydration and dehydration performance, revealing optimal water absorption under specific humidity levels. While MgSO4 and ZnSO4 demonstrate promising cyclic stability, FeSO4's performance is limited by overhydration. Further research is needed for market readiness.