共查询到19条相似文献,搜索用时 78 毫秒
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相变材料由于相变温度恒定、储能效果好、稳定性好等特征,在建筑墙体中的应用越来越多。介绍了相变材料的分类及建筑用相变材料的选择原则,分析了影响相变墙体节能效果的因素,总结了相变储能墙体构件形式及特征,并对相变墙体在建筑中的应用节能效果进行了综合对比分析。结果表明,相变墙体的节能效果受到诸多因素的影响,包括相变材料自身特性、气候、墙体形式及材料经济性等。因此需要综合衡量才能得到相变材料在墙体中的最佳应用方式,使相变墙体的节能性能最优化。通过综合布局可以有效地发挥相变材料的高储能性,从而达到降低建筑能耗、提高室内热舒适性的目的。 相似文献
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总结了国内外石蜡类相变材料在节能方面的研究与进展.石蜡具有相变潜热高、无过冷现象、性能稳定、无腐蚀性、价格便宜等优点,因此被广泛应用在建筑、储能地板、太阳能储热、空调系统等方面. 相似文献
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Hyperbranched polyurethane solid–solid phase change material (HB-PUPCM) has been prepared via a two-step process. The phase
transition behaviors and morphologies of these HB-PUPCM films were investigated using differential scanning calorimetry (DSC),
wide-angle X-ray diffraction (WAXD) and polarizing optical microscopy (POM). PEG soft segment in the polyurethane was found
to be crystalline at room temperature. However, when the temperature was raised to PEG’s melting point, polyurethane did not
melt into the liquid state as in the case of pure PEG but changed to an amorphous solid state. In HB-PUPCM, PEG’s molecules
probably are tied to the hard segment chain so strongly by the chemical bonds that they cannot change to a liquid state but
change to the amorphous state in the transition processing. 相似文献
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PMMA-g-PEG的制备及其相转变性能研究 总被引:1,自引:0,他引:1
使甲基丙烯酸单封端聚乙二醇大分子单体(MA-PEG)与甲基丙烯酸甲酯(MMA)在N,N-二甲基甲酰胺(DMF)中进行自由基接枝共聚反应,得到了以PEG为支链,聚甲基丙烯酸甲酯为主链(PMMA-g-PEG)的接枝共聚物.用核磁共振(1H-NMR),傅立叶红外光谱(FTIR)和凝胶渗透色谱(GPC)对PMMA-g-PFG的结构与相对分子量进行了表征.结果表明,所合成的共聚物结构明确,在MA-PEG大分子单体与MMA的不同配比条件下,得到的PMMA-g-PEG的分子量和分子量分布基本相同.并通过差示扫描量热仪(DSC)研究了接枝共聚物的热力学性质,结果表明,PMMA-g-PEG具有明显的相转变,其相变焓、相变温度与PEG的含量有关,并且随其含量的增加而增大. 相似文献
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相变储能材料研究进展 总被引:1,自引:0,他引:1
综述了固-固相变储能材料(s-S PCMs:sofid-solid phase change materials)、固-液相变储能材料(s-1 PCMs:solid—liquid phase change materials)的主要优缺点,并主要介绍了以下2种封装方式:(1)PCMs与基体材料复合制成定型PCMs,包括:与有机高分子材料机械共混、用无机多孔材料封装;(2)PCMs微囊化。此外,还分析了PCMs的主要应用领域及PCMs的主要研究方向。 相似文献
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The air-cooled frost-free refrigerator has become the main power consumer among household appliances. This study presents a new air-cooled household refrigerator that uses PCM in the fresh food and freezing chambers. Operational characteristics and performance test results are provided in the conditions of off-peak refrigeration with PCM and conventional refrigeration with/without PCM. Results show that refrigeration off-peak modes resulted in the peak temperature difference between M-packs and maximum temperature increase of M-packs in the freezing chamber. The energy consumption of the refrigerator is relatively increased. The energy consumption of the refrigerator prototype with PCM under the original control mode is reduced by 18.6% and the compressor ON-time ratio is reduced by 13.6% compared with the refrigerator prototype without PCM. Frost-free refrigerator with PCM under original control type exhibits advantages in terms of energy consumption and food quality. 相似文献