Optimization about multilayer laminated film and getter device materials of vacuum insulation panel for using at high temperature

Abstract

To comply with energy saving regulations, vacuum insulation panels (VIPs) have been used in refrigerators and automatic vending machines for some years now. VIPs for low-temperature applications are constructed from laminated plastic films, which are heat-welded together to maintain a vacuum inside. At high temperatures, the vacuum is lost and the performance of these panels degrades sharply. But recently there has been a demand for efficient insulation materials for use in hot-water equipment (e.g., vending machines, heat pumps, boilers and water heaters), which necessitates the study of laminated plastic films and getter devices for high-temperature VIPs. Measurements have been made of the allowable temperature limit of plastic films and the release of water vapor and outgassing during temperature-programmed adsorption with different getter materials. Suitable laminated films and getter device systems for high-temperature VIPs were chosen based on the results of these measurements, and their long-term reliability was evaluated by measuring the thermal conductivity at high temperature. As a result it was found that high-retort CPP and PBT films are the most suitable materials for use in the welded layers of high-temperature VIPs (105 °C).