Thermochemical heat storage ability of ZnSO ₄ · 7H ₂ O as potential long‐term heat storage material

Abstract

Summary ZnSO4·7H2O is a promising thermochemical heat storage material. In this paper, we report a detailed thermodynamic study of ZnSO4·7H2O based on hydration/dehydration, cyclicability, and water sorption performance. The TG‐DSC measurements reported that at below 120°C, 1747 and 1298 J g−1enthalpy was recorded for dehydration and hydration, respectively. The relative‐humidity study showed that at 75% RH (0.148 g/g), the water sorption can be significantly improved compared to lower humidity (65% 0.131). The XRD study highlighted that the main structure of ZnSO4 after thermal treatment remains unchanged.

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