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| Calculation and Optimization of Thermal Conductivity of Vacuum Insulation Panels with Aerogel Composite Cores |
| LIANG Yuying1,WU Huijun1,2,YANG Jianming1,2,TANG Lan1
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1 School of Civil Engineering, Guangzhou University, Guangzhou 510006;
2 Institute of Building Energy Efficiency, Guangzhou University, Guangzhou 510006 |
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Abstract 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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Published: 20 July 2018
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2018, Vol. 32 
