水合盐相变储能材料研究

Recent Progress in the Hydrated Salt Phase Change Materials

水合盐相变储能材料具有原料丰富、储热密度高、价格低等优点,在太阳能高效利用、工业余废热利用、跨季节储热采暖、智能温室、食品储存保鲜、轻纺行业等方面有着广阔的市场前景及经济效益。但是,在实际应用过程中会遇到过冷、相分离、非协调性熔解、热传效率低(热导率低)、体积变化、循环稳定性、结晶速率慢以及热化学稳定性等问题。针对这些问题,通过密度泛函理论、成核剂"协同效应"、纳米导热粒子、微纳核壳结构构筑等研究提升水合盐相变储能材料性能及应用范围,该研究思路对于水合盐相变储能材料的开发具有重要意义。

Hydrated salt phase change materials have many advantages such as low price,easy acquirement and safety. Meanwhile,a wide range of utilizations including the efficient use of solar energy,the recovery of waste heat from the industry,cross-seasonal heat storage,intelligent greenhouses,the preservation of food storage and the industry of light textile have been achieved with good market prospects and economic benefits.However,it suffers the problems such as supercooling,phase separation,inconsistent melting,low heat transfer efficiency（ low thermal conductivity）,volume change,cycle stability,slow rate of crystallization and thermochemical stability in the practical applications. Through density functional theory（ DFT）,＂synergistic effect＂of nucleating agents,nano-conductive particles and the ＂micro-nano/core-shell structure ＂of phase change materials,the properties of hydrated salt phase change materials can be improved and its range of application can also be broadened. The present research strategy has great significance for the development and utilization of hydrated salt phase change materials.