Numerical examination of thermal bridging effects at the edges of vacuum-insulation-panels (VIP) in various constructions

Abstract

The thermal losses on the edges of vacuum insulation panels (VIP) are influenced by the thickness of the panels, the type of edge design (single- or multi-layered foils), the inorganic barrier material and the thickness of the barrier layers. Additional thermal bridging effects result from applications and constructions, e.g., the material used in the joint between two panels (e.g. elastomeric foam), the covering layers on the panels and the mechanical fasteners used for mounting and fixing. Via numerical simulations for VIP of varying thickness, the thermal bridging effects are determined for different influencing factors. The impact of the linear thermal transmittance on thermal resistance of panels of various sizes is calculated and equivalent thermal conductivity of the panels determined.