ABSTRACT
Evacuation of the pores of nanoporous insulating material leads to a thermal conductivity in the range of 5 up to 10 mW/(m · K) including aging effects. For the use in building constructions two different types exist: on the one hand the load-bearing vacuum insulating sandwiches (VIS) with its envelope made of stainless steel and on the other hand the vacuum isolation panels (VIP) with its envelope made of a multilayer film. The technical lifetime of vacuum insulated constructions is one of its central questions. For VIS individual values are determined which base on individual permeation coefficients from standardized measurements. The determination of the technical lifetime of VIP bases on statistical evaluation of single measurements. Another important property of vacuum insulating elements used in building constructions is its resistance against mechanical loads and impacts. It is shown by examples that depending on the element type (VIS or VIP) this resistance may vary enormously.
