Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Identification of Thermal Properties of Construction Materials Using Far-Field Contactless Temperature Measurements
The IR thermography of buildings is used extensively in the diagnostic of buildings for thermal renovation, but is limited more often in detection of hot/cold regions and thermal bridges. In this paper we propose an alternative use of IR temperature measurements to retrieve effective local thermal diffusivity of building walls. The approach is inspired from known technics for thermal measurement such as hot-disc method, but the heat source is supplied by a laser beam and field temperatures are measured by a camera. So, the setup for contactless measure of thermal diffusivity combined a laser spot of diameter of 1.2 cm as a source of adjustable heat power and a camera IR able to record infrared images with a chosen frequency (up to 200 Hz). An adapted numerical method is proposed to retrieve the effective radial thermal diffusion value from the temperature evolution recorded on some points on the wall surface. Since the setup is designed for in field measurement a robust algorithm for parameter identification problem such as a genetic algorithm (GA) has been used. Although reputed for its robustness, GA does a massive call to the direct problem leading to calculation time some time prohibitive. In this paper GA use a fast estimator of direct problem that use a metamodel issued from Proper Orthogonal Decomposition of a beforehand built-up snapshot matrix combined with a Radial Basis Function interpolation. Some results obtained using the proposed setup and inversion procedure are presented as un example.
Identification of Thermal Properties of Construction Materials Using Far-Field Contactless Temperature Measurements
The IR thermography of buildings is used extensively in the diagnostic of buildings for thermal renovation, but is limited more often in detection of hot/cold regions and thermal bridges. In this paper we propose an alternative use of IR temperature measurements to retrieve effective local thermal diffusivity of building walls. The approach is inspired from known technics for thermal measurement such as hot-disc method, but the heat source is supplied by a laser beam and field temperatures are measured by a camera. So, the setup for contactless measure of thermal diffusivity combined a laser spot of diameter of 1.2 cm as a source of adjustable heat power and a camera IR able to record infrared images with a chosen frequency (up to 200 Hz). An adapted numerical method is proposed to retrieve the effective radial thermal diffusion value from the temperature evolution recorded on some points on the wall surface. Since the setup is designed for in field measurement a robust algorithm for parameter identification problem such as a genetic algorithm (GA) has been used. Although reputed for its robustness, GA does a massive call to the direct problem leading to calculation time some time prohibitive. In this paper GA use a fast estimator of direct problem that use a metamodel issued from Proper Orthogonal Decomposition of a beforehand built-up snapshot matrix combined with a Radial Basis Function interpolation. Some results obtained using the proposed setup and inversion procedure are presented as un example.
Identification of Thermal Properties of Construction Materials Using Far-Field Contactless Temperature Measurements
Springer Ser.Geomech.,Geoengineer.
Rotaru, Ancuța (Herausgeber:in) / Younes, Nabil (Autor:in) / Mouchrik, Ikram (Autor:in) / Slamia, Marouen (Autor:in) / Belayachi, Naima (Autor:in) / Hoxha, Dashnor (Autor:in)
International Conference on Critical Thinking in Sustainable Rehabilitation and Risk Management of the Built Environment ; 2019 ; Iași, Romania
Critical Thinking in the Sustainable Rehabilitation and Risk Management of the Built Environment ; Kapitel: 21 ; 241-248
30.10.2020
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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