Effective thermal conductivity of a staggered double layer of vacuum.pdf

Energy and Buildings 43 (2011) 1241–1246 Contents lists available at ScienceDirect Energy and Buildings j o u rn al h omepage: w w w. elsev /locate/enbuild Effective thermal conductivity of a staggered double layer of vacuum insulation panels K. Ghazi Wakili ∗ , T. Stahl, S. Brunner Empa, Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, CH-8600 Duebendorf, Switzerland a r t i c l e i n f o a b s t r a c t Article history: The use of vacuum insulation panels in buildings has gradually increased in the past few years and Received 12 November 2010 developments in their production have occurred in parallel. This has mainly lead to an optimization of Received in revised form different hygro-thermal properties of both the core material as well as the envelope. The issue of thermal 22 December 2010 bridges caused by the 300 nm thin metallic layers of the barrier envelope and by the joints between two Accepted 8 January 2011 adjacent panels remains. The present study investigates the influence of these thermal bridges on the effective thermal conductivity of a staggered double-layer of vacuum insulation panels. For this purpose a Keywords: series of guarded hot plate measurements on single- and double-layers of vacuum insulation panels was Vacuum insulation panel Thermal bridge carried out.