Episode 14: Hartwig Künzel

In this episode of the pro clima Podcast, Simon sits down with Hartwig Künzel, who shares his journey with Fraunhofer—from accompanying his father at the test fields as a child, through his studies in chemical engineering, to his pivotal role today at the Institute. Hartwig dives into the critical role of understanding vapour permeability in construction, highlighting the creation and impact of the WUFI® model. He explains both the significance and complexities of working with WUFI®, along with the challenges that can arise in its calculation. Reflecting on earlier methods of hygrothermal modelling, Hartwig discusses their limitations. Now at the forefront of construction modelling, Hartwig leads efforts in developing and refining tools to measure risks like mould and rot, and is currently advancing in post-processing models to drive even greater accuracy in building science. “Vapour permeability is probably the most important parameter when it comes to hygrothermal simulations. The good thing about that is that is mostly pretty well known.” Special Guest: Hartwig Künzel.

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