A Review of Maintenance of Vacuum inside Vacuum Insulation Panels

Abstract

The growing concerns over global energy crisis and the phasing out of polyurethane foams blown with CFC-11, which has high Ozone Depletion Potential(ODP), have pushed thermal insulation technology to improve its e‹ciency. Vacuum Insulation Panel(VIP) has been regarded as a super thermal insulation material with a thermal resistance of about 5-10 times higher than conventional thermal insulation. Appropriate vacuum in VIP is one of the most important factors contributing to the long term heat insulation performance of VIP. In this paper, the researches on three factors, which in‰uence internal pressure inside VIP, including gas and water vapor permeation through the barrier, gas absorption by getters and desiccants and outgassing of the kernel, were reviewed respectively. Following this, the research emphasis and suggestions, which should be paid attention to, were summarized.

Improvement of vacuum characteristics of cryostats for HPGe gamma-radiation detectors

“…The Combogetter is now widely used to provide vacuum in the 10 −3 -10 −2 mbar range in the Vacuum Insulation Panels (VIP). The published results confirm the effectiveness of this type of getters, capable to maintain a medium vacuum for several years [29][30][31][32][33]. In [34], the ability of a Combogetter to serve as a hydrogen absorber in sealed packages intended for transportation of radiation materials, was investigated.…”