三水醋酸钠的过冷机理与实验研究

【中文摘要】 为了解决相变蓄热材料三水醋酸钠的过冷问题,对无机水合盐的过冷机理进行了分析,以三种不同配方的试验样品在相同的实验条件下进行对比实验,从样品的实验照片和记录的步冷温度曲线两方面分析了其凝固过程。实验结果表明,质量百分比为5%的成核剂十二水磷酸氢二钠能一定程度上抑制无机水合盐三水醋酸钠的过冷度,但其过冷度仍然较大;使用质量百分比5%的十二水磷酸氢二钠和质量百分比3%的增稠剂明胶做添加剂后,三水醋酸钠的过冷性能得到明显改善。

【英文摘要】 The supercooling mechanism of salt hydrates was analyzed to solve the supercooling of thermal storage material,sodium acetate trihydrate.The comparison experiment on three groups of different formulae was conducted under the same experimental conditions.Solidification process was analyzed based on the experimental photos of solidification and temperature curves of step cooling recorded.The results show that 5%(in mass) nucleating agent,twelve-hydrated disodium hydrogen phosphate,could reduce the supercooling degree of acetate hydroxide trihydrate to some extent but the supercooling degree was still large.However,the supercooling degree of sodium acetate trihydrate could decrease clearly by adding 3%(in mass) thickener gelatin and 5%(in mass) twelve-hydrated disodium hydrogen phosphate.

【中文关键词】 工程热物理; 三水醋酸钠; 过冷; 相变; 步冷温度曲线

【英文关键词】 Engineering thermophysics; Sodium acetate trihydrate; Supercooling; Phase change; Temperature curve for step cooling