Exakte U-Werte von Stahlbeton-Sandwichelementen

Precise U-values of precast concrete sandwich panels.

For the exact determination of the heat losses over the building envelope with static boundary conditions it is necessary to determine — besides other parameters — the thermal transmittance (U-value) of the exterior walls as accurate as possible. The U-value of precast concrete sandwich panels is quantified on the one hand out of the homogeneous layering of the three sandwich components and on the other hand out of the additional thermal losses of different anchor and joint systems. Usually simplified additions are assumed, which obviously simplify the computation method but generally lead to economically unfavorable results. With this in mind, a practice-suited computation method is presented which enables the exact examination of additional heat losses for anchor and joint systems for individual element configurations as well as the whole facade system and therefore leads to accurate U-values.