Influence of Al Foil Layers on Thermal Conductivity and Flexural Strength of Glass Fiber Core VIPs
Vacuum insulation panels (VIPs) are regarded as the most promising high-performance thermal insulation products on the market today.A high and stable vacuum state within VIP enclosure provides a durable service life for VIP.Its core is typically made of laminated glass fiber (GF) due to its low thermal conductivity,high modulus,high toughness,light weight and non-combustible property.However,fiber-bridging significantly exist under the low-pressure condition inside VIP,resulting in solid heat conduction intensified between the layers.Also,the VIP with pure GF core is comparatively soft.In this paper,aluminum foils were orderly arranged in 30cascading layers of GF core,10 different new structural VIPs with 1-10GF+ 1A1 were got to compare with the pure 30GF core VIP.The influence of different layers of Al foil on the thermal conductivity and flexural strength of VIPs were discussed.Thermal conductivities of the as-prepared VIPs with proportion of 490mm× 210mm were evaluated by the heat flow meter thermal conductivity instrumentation Netzsch HFM 436.Flexural strength was compared between the different samples by electronic universal testing machine.Results showed that A1 foil layers laminated in the core can make a contribution to the flexural strength of VIP.The thermal conductivity of the pure 30GF core VIP was 2.278 mW/(m · K),while the data of 1--8GF+ 1Al structure were higher than 2.278 mW/(m · K).The thermal conductivity of 9GF+Al and 10GF+Al structure were 2.330 mW/(m · K) and 2.146 mW/(m · K) respectively.Theoretical and experimental analysis showed that the optimum layers of Al foil for 30GF core are 2,and the structure is 10GF+ 1Al.
VIP glass fiber Al foil thermal conductivity flexural strength
Nie Lili Chen Zhaofeng
Super Insulation Composite Laboratory, College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing, 210016, P.R.China
国际会议
The 12th International Vacuum Insulation Symposium (IVIS 2015)(第十二届国际真空绝热材料会议)
南京
英文
1-5
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）