Detection of thermal anomalies on building façades using infrared thermography and supervised learning

Abstract

We propose a cost-effective, non-intrusive approach to assess the quality of the thermal isolation of the building stock in a given municipality or small city. Our prototype measurement system, mounted on a vehicle, acquires geotagged optical and infrared images from the street-side of the buildings. A basic approach to detect gross thermal anomalies, such as thermal bridges, via a binary classifier trained on 2000 carefully labeled infrared images is demonstrated. Thermal anomalies are identified with a precision score of around 89.2 % and 75.6 % recall on a test dataset of 1184 images infrared recorded in Hergiswil (NW). The enabled automated assessment helps to identify retrofitting targets and supports increasing the renovation rate.

Evaluation of Thermal Resistance of External Protection During Thermal Renovation of the Building

“…The set of thermal modernization works involves improving the thermal performance of the building's enclosing structures, the consumption of energy resources by engineering systems, and ensuring the energy efficiency of the building is not lower than the established minimum requirements for the energy efficiency of the building and requires significant financial investments (Spindler, U., 2022). The problem of thermal renovation is acute not only in Ukraine, this problem is solved with various scientific and technical approaches (Barahona, B.,2021;Fernandez-Luzuriaga, J., 2022;Li, H., 2022;Mehregan, M., 2022;Popescu, L. L., 2021) taking into account ethnic, economic and climatic features in many countries of the world (Echlouchi, K., 2022;Gonzalez-Caceres, A., 2022;Milovanovic, B., 2022;Ricci, M., 2022;Wu, H., 2022;Zhang, X., 2021). In addition to the energy-saving effect, thermal renovation measures reduce the negative impact on the environment by reducing carbon dioxide emissions into the atmosphere (Chen, R., 2021;Kalbasi, R., 2022;Nematchoua M. K., 2022).…”