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首页> 外文期刊>Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion >Study on solidification process of sodium acetate trihydrate for seasonal solar thermal energy storage
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Study on solidification process of sodium acetate trihydrate for seasonal solar thermal energy storage

机译：季铵太阳能热能储存醋酸钠三水合物凝固过程研究

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Abstract The phase change of sodium acetate (SA) aqueous solution to sodium acetate trihydrate (SAT) requires large supercooling degree, then the aqueous solution can be at liquid state at fairly low temperature without releasing the stored latent heat. Such a feature makes SAT a promising material for seasonal solar thermal energy storage. The present study firstly summarized the thermo-physical properties of the solid SAT and liquid SA aqueous solution at different temperatures and concentrations, including equilibrium temperatures, densities, specific heats and thermal conductivities. The calculation methods of these properties have been established. Secondly, with the aid of the above properties, a mathematic model of the thermal discharge process of the storage system, i.e. the solidification process of supercooled SA aqueous solution, was built based on the heat transfer between the phase changing material within a single storage tube and the external flowing heat transfer fluid (HTF). The experimentally obtained SAT crystal growth rate and the enthalpy change of solidifying supercooled SA aqueous solution were employed to aid the modelling. The discharge temperature and thermal power of the storage system were numerically obtained and analysed. The influence of the ambient temperature, the mass flow rate as well as the heat transfer coefficient of the HTF on the thermal discharge performance were discussed. Finally, the seasonal thermal storage density of SAT was given and compared to that of water and some sorption materials.
机译：<！[cdata [ 抽象 醋酸钠（SA）水溶液对醋酸钠三水合物（SAT）的相变，需要大的过冷度，然后水溶液可以在液态在相当低的温度下不释放储存的潜热。这种特征使SAT成为季节太阳能热能存储的有希望的材料。本研究首先总结了不同温度和浓度的固体饱和SA水溶液的热物理性质，包括平衡温度，密度，特定的热量和热导体。已经建立了这些属性的计算方法。其次，借助于上述性质，基于单个储存管内的相变材料之间的热传递，构建了存储系统的储存系统的热放电过程的数学模型，即超冷却SA水溶液的凝固过程和外部流动的传热液（HTF）。实验获得的SAT晶体生长速率和固化过冷SA水溶液的焓变化以帮助建模。在数值上获得并分析存储系统的放电温度和热功率。讨论了环境温度，质量流量以及HTF对热放电性能的热传递系数的影响。最后，给出了SAT的季节性热存储密度并与水和一些吸附材料进行比较。

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