季戊四醇与三羟甲基乙烷相变材料蓄热性能研究

发布时间：2018-01-18 03:11

  本文关键词：季戊四醇与三羟甲基乙烷相变材料蓄热性能研究　出处：《太阳能学报》2017年09期 　论文类型：期刊论文

  更多相关文章： 固-固相变 复合材料 相变温度 过冷度 导热性能

【摘要】：对一类可用于太阳能中温蓄热的有机相变材料性能进行实验分析。相变蓄热材料具有储热密度大、温度波动小等优点,但也存在导热系数低、过冷度较大的问题,对相变材料进行复合,能有效改善其相变特性与导热性能。利用高温融化-混合的方法制备季戊四醇(PE)与三羟甲基乙烷(PG)的混合材料,使用DSC仪器分析相变温度与相变潜热,同时研究不同形核剂对混合材料的相变温度、过冷度的影响。利用压制成型—融化吸附—冷却的方法制备膨胀石墨与PE、PG的复合相变材料,用激光导热系数测试仪测试复合相变材料的导热性能。结果表明,PE与PG混合相变材料的相变温度区间基本在25℃以上,过冷度约15℃,膨胀石墨作为形核剂,使过冷度有一定减小。增加复合相变材料中膨胀石墨的含量能提高材料各个方向的导热系数。
[Abstract]:The properties of a class of organic phase change materials which can be used for solar energy medium temperature storage are analyzed experimentally. The phase change materials have the advantages of high heat storage density and low temperature fluctuation, but there are also low thermal conductivity. When the supercooling degree is high, the phase change material is recombined. The mixture of pentaerythritol (PE) and trimethylolethane (PGN) was prepared by melting and mixing at high temperature. The phase transition temperature and latent heat of phase transition were analyzed by DSC instrument, and the phase transition temperature of different nucleating agents on the mixed material was also studied. The influence of undercooling degree. The composite phase change material of expanded graphite and PEPGs was prepared by pressing molding melting adsorption-cooling method. The thermal conductivity of composite phase change material was tested by laser thermal conductivity tester. The results show that the phase change temperature range of PE-PG mixed phase change material is above 25 鈩，

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