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Aerial Thermographic Image-Based Assessment of Thermal Bridges Using Representative Classifications and Calculations

Author

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  • Zoe Mayer

    (Karlsruhe Institute of Technology (KIT), Institute for Industrial Production (IIP), Hertzstr. 16, 76187 Karlsruhe, Germany)

  • Julia Heuer

    (Karlsruhe Institute of Technology (KIT), Institute for Industrial Production (IIP), Hertzstr. 16, 76187 Karlsruhe, Germany)

  • Rebekka Volk

    (Karlsruhe Institute of Technology (KIT), Institute for Industrial Production (IIP), Hertzstr. 16, 76187 Karlsruhe, Germany)

  • Frank Schultmann

    (Karlsruhe Institute of Technology (KIT), Institute for Industrial Production (IIP), Hertzstr. 16, 76187 Karlsruhe, Germany)

Abstract

Since the middle of the 20th century many any buildings were built without any energy standards and still have a comparably poor energy quality. To obtain an overview of the current thermal quality of buildings in a whole city district, it may be promising to work with thermographic images obtained by unmanned aerial vehicles (UAV). Aerial thermography represents a fast and cost-efficient approach compared to traditional terrestrial thermography. In this paper, we describe an approach to finding thermal bridges on aerial thermographic images and characterizing them in terms of their risk of mold formation, energy losses, retrofit costs, and retrofit benefits. To identify thermal bridge types that can be detected reliably on aerial thermographic images, we use a dataset collected with a UAV in an urban district of the German city of Karlsruhe. We classify and characterize 14 relevant thermal bridge types for the German building cohorts of the 1950s and 1960s. Concerning the criterion of mold formation, thermal bridges of window components, basement ceiling slabs, balcony slabs, floor slabs, and attics are found to be particularly relevant to retrofit projects. Regarding energy savings, the retrofit of thermal bridges of window sills, window lintels, and attics shows high potential. The retrofit of attics seems to be less attractive, when also taking into account the necessary retrofit costs.

Suggested Citation

  • Zoe Mayer & Julia Heuer & Rebekka Volk & Frank Schultmann, 2021. "Aerial Thermographic Image-Based Assessment of Thermal Bridges Using Representative Classifications and Calculations," Energies, MDPI, vol. 14(21), pages 1-43, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7360-:d:672711
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    References listed on IDEAS

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    3. Lucchi, Elena, 2018. "Applications of the infrared thermography in the energy audit of buildings: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 3077-3090.
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