Residual gas analysis in vacuum insulation panel (VIP) with glass fiber core and investigation of getter for VIP

Abstract

Vacuum insulation panel (VIP) based on glass fiber core material has attracted considerable attention in building insulation due to lower core material cost than fumed silica. The insulation performance and service life of VIP are significantly dependent on the residual gas pressure and gas composition in VIP. Residual gas composition is measured using a newly-developed test apparatus that contains quadrupole mass spectrometer (QMS) and gas inlet system (GIS) in this paper. The results indicate that the main residual gases are nitrogen (N2), oxygen (O2) and water vapor (H2O) in the initial stage of VIP with thermal conductivity 1.52 mW m−1 K−1, while nitrogen (N2), oxygen (O2) hydrogen (H2) and water vapor (H2O) become the main residual gases after two years with thermal conductivity 6.80 mW m−1 K−1. Correspondingly, a composite getter for VIP is investigated, sorption capacities of which for hydrogen (H2), oxygen (O2) and water vapor (H2O) are measured in this paper. It is predicted that the central thermal conductivity of VIP with getter increases to 15 mW m−1 K−1 after 25 years, which is one step towards a future recommendation for building sectors.