Chair of Building Physics and Building Constructions

Hazard Potential of Facades for Biogenic Infestation (Algae)

As part of the project “Development of capillary tube-based concrete solid absorbers with dual use for environmental energy utilization” funded by the German Federal Environmental Foundation (DBU), research was conducted to investigate the hazard potential of garage walls due to algae infestation resulting from the local cooling of building components caused by absorber function. In a first step, the boundary and environmental conditions for biological infestation on building components were determined and the state of science regarding the prevention of biological growth on exterior building components was assessed. These were used to create indicators for borderline cases.

Following this basic research, the exterior components with integrated capillary tube-based concrete solid absorbers were then modeled for a transient simulation of coupled heat and moisture transport. This simulation was used to investigate and analyze the loss of heat from the exterior building components and the moisture balance at the building component surface as a function of day-night and annual climate. The temperature and humidity curves in particular on the component surface were analyzed with respect to the indicators of biogenic infestation and evaluated with respect to the hazard potential.

Funding organizationDeutsche Bundesstiftung Umwelt (DBU)
Project durationApril 2012 – September 2012
Participating research groupsChair of Building Physics and Building Constructions, Chair of Polymer Technology and Polymer Physics, Chair of Building Energy Engineering – Hermann Rietschel Institute
Project information