| 摘要: |
| 针对移动供热的温度范围，相变温度为119 ℃的赤藻糖醇具有很大的应用潜力，但其导热系数低、放热不稳定、容易过冷等不足。本文通过添加纳米材料作为成核剂改善赤藻糖醇性能，制备了不同纳米材料的相变复合材料。对样品的融化-凝固进行观察记录，绘制时间温度曲线并对纳米氧化钛在质量分数不同的情况下进行体积膨胀率和密度、过冷度、相变潜热、导热系数测定，测试表明，相对于纯赤藻糖醇添加纳米级物质作为成核剂可以减小相变材料的过冷度，并且在一定程度上可以提高相变材料的导热系数；纳米二氧化钛对样本的密度数值上有0.02~0.08 g/cm3的波动，膨胀率呈减小的趋势；添加0.1%的纳米二氧化钛-赤藻糖醇过冷度下降37.91%，潜热值下降2.25%，固态导热系数增大3.67倍。 |
| 关键词: 储能技术 赤藻糖醇 纳米复合材料 热物理性能 |
| DOI： |
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| 基金项目: |
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| Experimental Research on Nanotitanium-erythritol Energy Storage System |
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Zhang Xuelai, Ding Jinhong, Luo Xiaoxue, Xu Weiwen
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| (Institute of Cooling Energy Storage Technology, Shanghai Maritime University) |
| Abstract: |
| Erythritol with transformation temperature of 119 ℃ has huge potential in application according to temperature range of mobile heating, but it is also limited by its disadvantage of low thermal conductivity, unstable heat releasing, bigger supercooling. Nanometer materials as nucleating agents were putted into erythritol in order to improve its thermal properties, and the composite can be used as phase change materials (PCMs). The properties of nanotitanium-erythritol with different mass ratio have be gained by time-temperature curve, differential scanning calorimetry (DSC),thermal conductivity test and other properties testing. The results show that Nanometer materials can decrease the supercooling of erythritol in a large degree, and it can also increase its thermal conductivity in small extent; Nanometer titania can decrease the composite’s coefficient of cubical expansion, and the composite’s density will fluctuate over a little range with 0.02~0.08 g/cm3; Nanometer titania of 0.1% mass ratio has a drop of 37.91 percent in erythritol’s supecooling, 1.09 percent in its latent heat and a growth of 3.67 times in solid thermal conductivity. |
| Key words: energy storage technology erythritol PCMs thermal property |
