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开发了一种熔点为78℃的八水氢氧化钡复合相变材料,通过添加成核剂使复合相变材料的过冷度降低3~5℃,结合纳米技术使材料的热导率提高了11.7%。基于包含复合相变蓄热材料与石蜡、水蓄热的梯级蓄热太阳能光伏、光热集热器,对该新型材料的释热特性进行了实验,实验结果表明,八水氢氧化钡复合相变蓄热材料无过冷,在其相变温度上相变平稳。在水流量为90 L·h~(-1),环境温度为20℃时,集热系统可以有效地储存太阳能,以50℃为参考点放热时间长达60 min以上,且在放水前20 min内,系统的出水温度都高于70℃,因此该系统能够在降低太阳电池工作温度的同时,满足日常生活需求。
A phase transition material of barium hydroxide octahydrate with a melting point of 78 ℃ has been developed. By adding a nucleating agent, the undercooling of the composite phase change material is reduced by 3 ~ 5 ℃. The thermal conductivity of the material is improved by the combination of nanotechnology 11.7%. The heat release characteristics of the novel material were tested based on the cascade thermal storage solar photovoltaic and solar collector containing composite phase change thermal storage material and paraffin wax and water thermal storage. The experimental results show that the composite phase of octahydrate barium hydroxide octahydrate Variable heat storage material without subcooling, stable phase transition temperature. When the water flow rate is 90 L · h -1 and the ambient temperature is 20 ℃, the solar collector system can effectively store solar energy, and the heat release time is longer than 60 min with the reference point of 50 ℃ as long as 60 min. min, the system’s water temperature is higher than 70 ℃, so the system can reduce the solar cell operating temperature at the same time, to meet the daily needs.