Determination of the Thermal Conductivity of Vacuum Insulation Panels at Fire/Elevated Temperatures
In this study,a new method for the determination of the thermal conductivity of the VIPs core material (i.e.fumed silica) at elevated temperatures,up to 900℃,is proposed.An experimental set up,based on the heat flow meter apparatus method,is designed and realized.Two VIPs are joined together to form a specimen,which is subjected to fire conditions from one side,while the other side faces ambient conditions,simulating realistic fire conditions.The temperatures on both sides and the heat flux on the unexposed side are recorded and utilized for the determination of the thermal conductivity.The experimental data are coupled with a detailed numerical model,used for the determination of the VIPs core material thermal conductivity.An optimization technique is utilized in order to define the parameters of the model.The contribution of each heat transfer mechanism,i.e.gas conduction,solid conduction and radiation,of the detailed numerical model to the overall thermal conductivity is investigated.
vacuum insulation panels thermal conductivity modeling fire
Dimos A.Kontogeorgos Georgios K.Semitelos Ioannis D.Mandilaras Roland Caps Libor Kubina Maria A.Founti
National Technical University of Athens, School of Mechanical Engineering, Lab.Of Heterogeneous Mixt Va-Q-Tec AG, Karl Ferdinand Braunstrasse 7, 97080 Wurzburg, Germany
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
318-321
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）