Grenzen der Verfahren zur Bewertung des Sommerlichen Wärmeschutzes nach DIN 4108-2:2013

Abstract

The limitations of the overheating risk assessment procedures according to DIN 4108-2:2013. The methodology of DIN 4108-2 for assessing the overheating probability of a critical room no longer reflects scientific and technical standards. There is increasing criticism in the literature. The article explains the methodology and background of DIN 4108-2 and summarizes known application limits and shortcomings from the literature. These concern both assumed boundary conditions and the representation of the relevant physical effects and assessment criteria. Furthermore, the paper claims that the building use and geometry must be integrated in a more differentiated manner as a relevant category in the consideration of the overheating risk. On analyzing five practical examples, contradictions between the results of the simplified method, the simulations with boundary conditions according to DIN 4108-2 and the simulations with building-specific boundary conditions are shown. By means of a comparison of measurement and simulation results for one of these example rooms, the limitations of the simulation analyses are also addressed. The aim of this illustration is to mediate between the scientific discussion, which is based on highly idealized cases, and the practice-related planning challenges, where the applicability of these assessment approaches is often unclear.