1 School of Civil Engineering, Guangzhou University, Guangzhou 510006; 2 Institute of Building Energy Efficiency, Guangzhou University, Guangzhou 510006
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.
1 Collins T J. Review of the twenty-three year evolution of the first university course in green chemistry: Teaching future leaders how to create sustainable societies[J]. Journal of Cleaner Production,2017,18(140):93. 2 Air-conditioning engineers. 2015 ASHRAE handbook: Heating, ventilating, and air-conditioning applications[M]. Ashrae,2015. 3 Schiavoni S, D’Alessandro F, Bianchi F, et al. Insulation materials for the building sector: A review and comparative analysis[J]. Renewable & Sustainable Energy Reviews,2016,62: 988. 4 Kaln S S E, Jelle B P. Vacuum insulation panel products: A state-of-the-art review and future research pathways[J]. Applied Energy,2014,116(3):355. 5 Cuce E, Cuce P M, Wood C J, et al. Toward aerogel based thermal superinsulation in buildings: A comprehensive review[J]. Rene-wable & Sustainable Energy Reviews,2014,34(3):273. 6 Bouquerel M, Duforestel T, Baillis D, et al. Heat transfer modeling in vacuum insulation panels containing nanoporous silicas—A review[J]. Energy Buildings,2012,54(37):320. 7 Wang S X, Walliman N, Ogden R, et al. VIPs and their applications in buildings: A review[J]. Construction Materials,2007,160(4):145. 8 Caps R, Beyrichen H, Kraus D, et al. Quality control of vacuum insulation panels: Methods of measuring gas pressure[J]. Vacuum,2008,82(7):691. 9 ASTM C1484-10, Standard specification for vacuum insulation pa-nels[S]. ASTM Intstruction, West Conshohoken, United States,2010. 10 Di X B, Gao Y M, Bao C G, et al. Optimization of glass fiber based core materials for vacuum insulation panels with laminated aluminum foils as envelopes[J]. Vacuum,2013,97: 55. 11 Alam M, Singh H, Limbachiya M C. Vacuum insulation panels (VIPs) for building construction industry-A review of the contemporary developments and future directions[J]. Applied Energy,2011,88(11):3592. 12 Kan A K, Meng C, Guo Z P, et al. Modeling and measurement of effective thermal conductivity of vacuum insulation panels[J]. Chinese Journal of Vacuum Science and Technology,2016,36(8):935(in Chinese). 阚安康,孟闯,郭志鹏,等.真空绝热板导热系数预测模型及实验研究[J].真空科学与技术学报,2016,36(8):935. 13 Li C, Li B, Pan N, et al. Thermo-physical properties of polyester fiber reinforced fumed silica/hollow glass microsphere composite core and resulted vacuum insulation panel[J]. Energy Buildings,2016,125:298. 14 Yang J M,Wu H J, Zhong Z K, et al. Calculation and optimization of thermal conductivity of fused silica fiber/aerogel composites[J].Materials Review B: Research Papers,2016,30(10):139(in Chinese). 杨建明,吴会军,钟支葵,等.石英玻璃纤维/气凝胶复合材料的热导率计算及优化[J].材料导报:研究篇,2016,30(10):139. 15 Liao Y D, Wu H J, Ding Y F, et al. Engineering thermal and mechanical properties of flexible fiber-reinforced aerogel composites[J]. Journal of Sol-Gel Science and Technology,2012,63:445. 16 Simmler H, Brunner S, Heinemann U, et al. Vacuum insulation panels: Study on VIP-components and panels for service life prediction of VIP in building applications (Subtask A)[J]. Final Report for the IEA/ECBCS Annex,2005,39:38. 17 Wang M R, Pan N. Predictions of effective physical properties of complex multiphase materials[J]. Materials Science and Engineering R: Reports,2008,63(1):1. 18 Zeng S O, Hunt A, Greif R, et al. Geometric structure and thermal conductivity of porous medium silica aerogel[J]. Journal of Heat Transfer,1995,117(4):1055. 19 Yang J M, Wu H J, Wang M R, et al. Predicting thermal conducti-vity of fiber-reinfored aerogel composite materials[J]. Materials Review A: Review Papers,2015,29(11):124(in Chinese). 杨建明,吴会军,王沫然.预测纤维增强气凝胶复合材料热导率的研究进展[J].材料导报:综述篇,2015,29(11):124. 20 Wei G S, Liu Y S, Zhang X X, et al. Thermal conductivities study on silica aerogel and its composite insulation materials[J]. International Journal of Heat and Mass Transfer,2011,54(11-12):2355. 21 Shi X J, Zhang R F, He S, et al. Synthesis and heat insulation performance of glass fiber reinforced SiO2 aerogel composites[J]. Journal of the Chinese Ceramic Society,2016,44(1):129(in Chinese). 石小靖,张瑞芳,何松,等.玻璃纤维增韧SiO2气凝胶复合材料的制备及隔热性能[J].硅酸盐学报,2016,44(1):129.
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2018, Vol. 32 
