Modelling of Long-term Hygro-thermal Behaviour of Vacuum Insulation Panels
The low thermal conductivity of Vacuum Insulation Panels (VIPs) is not stable but increases with time due to gas permeation through VIPs barriers and the ageing of their envelope and core material.Accelerated experiments are carried out in order to better understand this ageing process but they are not sufficient to predict the long term performance of panels.Models have to be used to connect the short term evaluation and the long term behaviours in order to improve the prediction of the thermal conductivity evolution.This paper describes the development of a VIP model in the Dymola(R) software.This model takes into account the envelope and core material hydro-thermal characteristics and behaviours,and integrates the actual solicitations of the panels on site The thermo-activation of the envelope permeance is integrated.Many properties of the core material are modelized: type of silica,sorption isotherm,hygro-thermal ageing,pore size distribution,etc..Simulations in constant and variable conditions in temperature and moisture have been carried out.The results show first at all the unexpectable real behaviour of the VIPs conductivity,not accessible by simple short term linear evolution,and then the important impact of the core material characterization on the estimated long term performance of VIPs.
vacuum insulation panels core material behaviour mass and heat transport modelling
Antoine Batard Thierry Duforestel Lionel Flandin Bernard Yrieix
EDF R&D-ENERBAT-EDF Lab Les Renardières-77818 Moret-sur-Loing, France;LEPMI-LMOPS-Université de Savo EDF R&D-ENERBAT-EDF Lab Les Renardières-77818 Moret-sur-Loing, France LEPMI-LMOPS-Université de Savoie-Campus Savoie Teehnolae-Hélios-73376 Le Bourget-du-Lac, France EDF R&D-MMC-EDF Lab Les Renardières-77818 Moret-sur-Loing, France
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
212-215
2015-09-01（万方平台首次上网日期，不代表论文的发表时间）