十二水硫酸铝铵新型复合相变材料及其性能研究  

Study on aluminum ammonium sulfate dodecahydrate composite phase change material and its properties

作　　者：樊占胜 鹿院卫[1] 王元媛 李正阳 赵甜 吴玉庭[1] FAN Zhansheng;LU Yuanwei;WANG Yuanyuan;LI Zhengyang;ZHAO Tian;WU Yuting(MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学传热强化与过程节能教育部重点实验室,北京100124

出　　处：《热力发电》2023年第2期32-38,共7页Thermal Power Generation

基　　金：国家自然科学基金项目(52076006,52106096)。

摘　　要：为了解决单一水合盐相变材料过冷度大、热导率小、循环稳定性差等问题,以十二水硫酸铝铵为相变材料,采用熔融共混法将Al2O3与黄原胶作为添加剂对十二水硫酸铝铵进行改性,采用多孔吸附法将改性膨胀石墨和改性十二水硫酸铝铵复合,制备了一种新型复合相变材料,并研究了其热物性、过冷度、循环稳定性和材料相容性。实验结果表明:复合相变材料的熔点、潜热和导热系数分别为93.23℃、235.40 k J/kg和4.086 W/(m·K);循环50次后,过冷度稳定在24.00℃,且循环300次后,潜热仅下降5.9%,具有较好稳定性;316L不锈钢和复合相变材料具有较好的相容性,可作为封装容器材料使用。该复合相变材料具有良好的性能,在建筑物供暖方面具有较大的应用潜力。In order to solve the problems of high supercooling degree, low thermal conductivity and poor cycle stability of single hydrated salt phase change material, ammonium aluminum sulfate dodecahydrate was used as phase change material, Al2O3and xanthan gum were used as additives to modify ammonium aluminum sulfate dodecahydrate by melt blending, and a new composite phase change material was prepared by using porous adsorption method to composite modified expanded graphite and modified ammonium aluminum sulfate dodecahydrate. The thermophysical properties, supercooling degree, cycle stability and material compatibility were analyzed. The results show that, the melting point, latent heat and thermal conductivity of the composite phase change material were 93.23 ℃, 235.40 k J/kg and 4.086 W/(m·K), respectively. After 50 cycles, the supercooling degree was stable at 24 ℃, and after 300 cycles, the latent heat only decreased by 5.9%, with good stability. The 316 L stainless steel and composite phase change materials have good compatibility, and can be used as packaging container materials. The composite phase change material has good performance and great application potential in building heating.

关 键 词：复合相变材料 十二水硫酸铝铵 热物性 相容性 稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程]