Thermochemical heat storage materials for space heating applications such as, ZnSO₄ offer high energy storage density, low cost and clean mean of long-term solar energy storage. Herein, we studied the ZnSO₄ hydrated salt as potential heat storage material at low temperature and furthermore observed the impact of temperature and concentration on the dehydration/hydration process and enthalpy. The thermal behavior of ZnSO₄•7H₂O was investigated by applying various dehydration temperatures. The results showed that 85% of water loosed at 100 °C temperature, which released 699 J/g (1.37 GJ/m³) in the dehydration process. The hydration process of ZnSO₄.7H₂O at 100 °C recovered 541 J/g enthalpies, which delivered 1.1 GJ/m³. Similarly, the dehydration result obtained at 150 °C was the same as showed at 100 °C. However, the enthalpy of hydration was 20% less than prior. The XRD result showed that at higher temperatures agglomeration appeared followed by Van der Waals forces which affect the hydration rate. The result of good cyclability and larger water sorption performance of ZnSO₄ make them a promising and suitable for heat storage in space heating application, which can be used as thermochemical heat storage material for thermal storage devices.

ZnSO ₄等用于空间供热应用的热化学储热材料具有很高的储能密度，低成本和长期太阳能存储的清洁手段。在这里，我们研究了作为低温储热材料的ZnSO ₄水合盐，并进一步观察了温度和浓度对脱水/水合过程和焓的影响。通过应用不同的脱水温度研究了ZnSO ₄ •7H ₂ O的热行为。结果表明，在100°C的温度下有85％的水散失，在脱水过程中释放出699 J / g（1.37 GJ / m ³）。ZnSO ₄ .7H ₂的水合过程O在100°C时回收了541 J / g的焓，该焓为1.1 GJ / m ³。类似地，在150℃下获得的脱水结果与在100℃下显示的相同。但是，水合焓比以前降低了20％。XRD结果表明，在较高温度下出现团聚，随后出现范德华力影响水合速率。ZnSO ₄的良好的可循环性和较大的吸水性能的结果使其成为有前途的并且适合在空间加热应用中的储热，可以用作储热装置的热化学储热材料。