| 梁玉莹,吴会军,杨建明,唐兰.气凝胶复合材料真空绝热板的热导率计算及优化[J].材料导报,2018,32(12):2112-2117 |
| 气凝胶复合材料真空绝热板的热导率计算及优化 |
| Calculation and Optimization of Thermal Conductivity of Vacuum Insulation Panels with Aerogel Composite Cores |
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| DOI：10.11896/j.issn.1005-023X.2018.12.032 |
| 中文关键词: 气凝胶 真空 绝热 热导率 优化 |
| 英文关键词: aerogel, vacuum, thermal insulation, thermal conductivity, optimization |
| 基金项目:国家自然科学基金(51678167)；广东省自然科学杰出青年基金(S2013050014139)；广东省教育厅重大科研项目(2016KZDXM035) |
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| 中文摘要: |
| 采用常压干燥和抽真空工艺制备了气凝胶复合材料真空绝热板,基于一维稳态导热建立了气凝胶复合材料真空绝热板热导率的理论计算模型,研究了气凝胶密度和纤维含量对热导率的影响。结果表明,气凝胶复合材料真空绝热板的热导率随着气凝胶密度的增大而增大,随着纤维含量的增大呈现先减小后增大的抛物线型趋势,因此在某一最优的纤维含量下气凝胶复合材料真空绝热板具有最小的热导率。当气体压力为1 Pa、103 Pa和105 Pa,对应的纤维含量分别为7.3%、7.0%和2.5%(体积分数,下同)时,真空绝热板具有最小的热导率,分别为3.5 mW·m-1·K-1、3.8 mW·m-1·K-1和15.8 mW·m-1·K-1。研究结果可用于指导气凝胶复合材料真空绝热板的设计与性能优化,促进气凝胶复合材料真空绝热板在建筑保温领域的应用。 |
| 英文摘要: |
| Vacuum insulation panels with aerogel composite cores were prepared via techniques of ambient pressure drying and outgassing vacuum. Based on one-dimensional steady heat transfer, a theoretical model was built to predict the thermal conductivity of vacuum insulation panels with aerogel composite cores. The effects of aerogel density and fiber content on the thermal conductivities were investigated. The results indicated that the thermal conductivities increased with the increase of aerogel density. The thermal conductivities decreased firstly and then increased, with the increase of fiber content, with a minimum thermal conductivity at the optimal fiber content. For example, the optimal fiber contents were 7.3vol%,7.0vol% and 2.5vol% at the gas pressures of 1 Pa,103 Pa and 105 Pa respectively, and the corresponding minimum thermal conductivities, 3.5 mW·m-1·K-1,3.8 mW·m-1·K-1 and 15.8 mW·m-1·K-1 can be achieved respectively, which presented ultralow thermal conductivities of vacuum insulation panels with aerogel composite cores. Those optimized results could provide guidance for the structure design and properties optimization of vacuum insulation panels with aerogel composite cores, and thereby promoting their application as building thermal insulator. |
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