三水合乙酸钠复合相变储热材料的制备与热物性研究-走动力工程及工程热物理专业毕业论文.docx

广东．X-,_lk大学硕士学位论文3、针对膨胀石墨大小粒径混合添加发现，50目：320目膨胀石墨比例为5：3时，膨 广东．X-,_lk大学硕士学位论文 3、针对膨胀石墨大小粒径混合添加发现，50目：320目膨胀石墨比例为5：3时，膨 胀石墨在三水合乙酸钠中形成了较好的导热网链，复合材料的导热系数为2．89 W／(m·K)，储放热时间大幅缩短，320目膨胀石墨未影响复合材料相变潜热，相 变温度升高约1℃。经多次循环后材料过冷度维持1．2。C。 关键词：相变材料；膨胀石墨；潜热；复合材料 万方数据 AbstractAbstract Abstract Abstract With the rapid development of society，the contradiction between the massive consumption of fossil energy and the worsening environment is becoming more and more obvious．Improving energy utilization is the main method to alleviate the contradiction between energy and environment．Phase change energy storage material is a kind of material that can realize the time—space conversion ofthermal energy，which is of great significance to improve the utilization of energy．Sodium acetate trihydrate is a common phase change material，which has a series of advantages，such as large amount of latent heat of phase change，low-cost and wide source．It’S widely used in household heat storage，heat pump，industrial waste heat recovery，etc．However， due to its low thermal conductivity and low heat release rate．Therefore，it is the key to improve the thermal conductivity and the heat transfer rate of the material．Aiming at solving the problem of sodium acetate trihydrate disadvantages，such as its low thermal conductivity and low heat release rate．In this paper，mixed addition method Was proposed to improve the thermal conductivity of materials．And researching how different additives affecting the performance， meanwhile doing comparative analysis． In the paper，expanded graphite Was used as the material to enhance thermal conductivity， Sodium acetate trihydrate is the phase change heat storage material．Method of melt blending Was applied to producing composite phase—change thermal energy storage materials，composed of expanded graphite and Sodium acetate trihydrate．In order to characterized and tested micro morphology and thermal properties of the composite materials，and researching addition amount of expanded graph