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The novel MgSO₄/ZnSO₄ (MZx) composite was prepared and characterized for their long term heat storage application. Initially, the water sorption and desorption of the MZx composite was performed and then its water uptaking was checked under constant temperature and humidity. The results revealed that hydration enthalpy and adsorption mass were depended on charging temperature, mass ration, humidity, and hydration temperature.

The DSC study of the MZx composite concerning pure MgSO₄ and ZnSO₄ was studied and it was observed that the hydration behavior of the MZx composite was 34 and 48% improved than its counterparts respectively.

The effect of humidity and temperature on adsorbed mass was studied under constant temperature and humidity. The result showed that at 75% humidity under 45 °C, the MZx composite adsorbed its maximum (0.21 g/g) water mass. Based on the results, the …