“…14,[19][20][21] Inorganic PCMs include crystalline hydrated salts, molten salts, metals, their alloys, etc. [22][23][24][25] Among them, hydrated salts are the most widely used inorganic PCMs due to their advantages such as non-combustibility, high latent heat density, and low cost. [26][27][28][29] The mechanism of phase change energy storage for hydrated salts is as follows: when the temperature is below the phase change temperature, the anhydrous salts will combine with water to form crystalline hydrated salts.…”