Thermal energy storage based on phase change materials (PCMs) plays a key role in bridging the gap between energy supply and demand for renewable energy applications. Hydrated salt is one kind of the most promising PCMs due to high phase-change enthalpy, non-flammability and low cost. Herein, we design and fabricate a lab-scale high energy-density and power-density thermal energy storage (TES) device using hydrated salt-based phase change composite (PCC). The thermophysical properties of the hydrated salt-based PCC are characterized and the thermal performances of the PCC-based TES device are analyzed at different operating conditions during charging and discharging processes. The Differential Scanning Calorimeter (DSC) analysis shows that the PCC has high phase-change enthalpy of 184.5 kJ·kg⁻¹ and suitable phase-change temperature of 50 ℃ for hot water heating. The experimental results show that the PCC-based TES device exhibits high specific energy storage density up to 88.4 kWh·m⁻³, approximately 2.6 times higher than the conventional water tank storage device. In discharging process, the PCC-based TES device exhibits high energy density (∼81.6 kWh·m⁻³), high efficiency (∼92.3 %), high power density (∼669.9 W·kg⁻¹), and stable output hot water temperature (45 ∼ 47 ℃) at different water flow rates (0.42 ∼ 2.42 L·min⁻¹) and inlet cold water temperatures (8 ∼ 25 ℃).

基于相变材料 (PCM) 的热能存储在弥合可再生能源应用的能源供需差距方面发挥着关键作用。水合盐具有相变焓高、不易燃、成本低等优点，是最有发展前景的一种相变材料。在此，我们使用水合盐基相变复合材料 (PCC) 设计并制造了实验室规模的高能量密度和功率密度热能存储 (TES) 装置。表征了水合盐基 PCC 的热物理性质，并分析了 PCC 基 TES 器件在充放电过程中不同工作条件下的热性能。^{差示扫描量热仪 (DSC) 分析表明，PCC 具有 184.5 kJ·kg -1}的高相变焓热水加热适宜的相变温度为50℃。^{实验结果表明，基于PCC的TES装置具有高达88.4 kWh·m -3}的高比储能密度，是传统水箱储能装置的约2.6倍。在放电过程中，基于PCC的TES装置具有高能量密度（~81.6 kWh·m ^-3）、高效率（~92.3 %）、高功率密度（~669.9 W·kg ^-1）和稳定的输出热水在不同的水流量（0.42 ∼ 2.42 L·min ^-1）和入口冷水温度（8 ∼ 25 ℃）下，温度（45 ∼ 47 ℃）。