Accelerated Ageing of Vacuum Insulation Panels

Vacuum insulation panels (VIP) is a high performance thermal insulation material solution with thermal conductivity values reaching as low as 4.0 mW/(mK). With time the thermal performance of the VIPs will degrade as moisture and gas permeate through the barrier envelope of the panels. To better evaluate these ageing effects, accelerated ageing experiments are needed. VIPs consist of a porous core of pyrogenic silica (SiO2) and a gas and vapour tight envelope. The external factors that are found to contribute most to ageing of VIPs are temperature, moisture and pressure. Several experiments have been initiated to evaluate the acceleration effects by the application of severe temperature, moisture and pressure conditions, including: 1. Thermal ageing at 80°C for 180 days according to CUAP 12.01/30 2. Exposure to cyclic climate in a vertical climate simulator according to NT Build 495. One VIP sample is fully exposed in the simulator and one is placed in a wooden frame structure. 3. Exposure to high vapour pressure by storage at 70°C and 90-100 % RH for 90 days. The increases in thermal conductivity during ageing were relatively small compared to the initial thermal conductivity of the VIPs, which is in agreement with the theoretical predictions. The temperature and moisture experiment seemed to achieve a rather large acceleration effect. In addition, the thermally aged VIP and the exposed VIP in the climate simulator show physical alterations. E.g. swelling, curving and delamination of the outer fire protection layer are observed.

Additional Info

  • WP: Advanced materials technologies
  • Publication Year: 2010
  • Number: 227-238
  • Name of proceedings: Proceedings of Renewable Energy Research conference 2010
  • Name of conference: Renewable Energy Research Conference
  • Town: Trondheim
  • Country: Norway
  • Date from: Monday, 07 June 2010
  • Date to: Tuesday, 08 June 2010

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