Estimation of the thermal resistance of a building wall with inverse techniques based on rapid active in situ measurements and white-box or ARX black-box models

François, Adrien; Ibos, Laurent; Feuillet, Vincent; Meulemans, Johann

doi:10.1016/j.enbuild.2020.110346

Cited by 19 publications

(22 citation statements)

References 69 publications

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“…-Thermal resistance R1D is estimated with the active method introduced by the authors in [13] and presented in section 5.2. This technique, developed for the characterization of a homogeneous wall, is based on an inverse technique using a white-box model.…”

Section: General Methodsmentioning

confidence: 99%

“…The inverse method is briefly presented in this section. For more information, please refer to [13]. The method is based on four main steps:…”

Section: Inverse Methods For Homogeneous Wall Characterizationmentioning

confidence: 99%

“…The order n is increased until the difference between the measurements and the fitted function stops decreasing. The choice n = 7 proved to work well [13].…”

Section: Define An Analytical Expression Of the Model Inputmentioning

confidence: 99%

“…Two models are used, depending on the configuration (weather conditions). They will be referred as model A and model C to match notations used in [13]. The models are presented in Fig 19 . Model C may rely on results obtained from model D. Temperature Tin and heat flux ϕin are not used for the estimation: there is no need to implement contact sensors inside the wall.…”

Section: Choice Of Direct Modelmentioning

confidence: 99%

“…This work proposes a novel dynamic method for the in situ characterization of thermal bridges. It is a generalization of a technique developed by the authors for the measurement of a homogeneous wall thermal resistance [13]. It mainly consists in heating the indoor air and using inverse methods to estimate the wall thermal resistance from heat flux and temperature measurements.…”

mentioning

confidence: 99%

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In situ measurement method for the quantification of the thermal transmittance of a non-homogeneous wall or a thermal bridge using an inverse technique and active infrared thermography

François

Ibos

Feuillet

et al. 2021

Energy and Buildings

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Thermal bridges tend to increase overall buildings energy demand and might cause water condensation problems. They are thermally characterized by a linear transmission coefficient ψ or a point transmission coefficient χ. Today, most studies of thermal bridges are based on theoretical or numerical calculations. Standardized methods define default values and assumptions to make in simple or detailed simulations. The few existing in situ characterization methods of thermal bridges are based on steady-state assumptions. This makes them highly sensitive to weather conditions and often requires very long measurements. The present paper proposes a novel active method for the in situ characterization of a thermal bridge. It generalizes a measurement of a homogeneous wall thermal resistance. The indoor air is rapidly heated for a few hours (typically 6) and the wall thermal response is analyzed with an inverse technique based on a white-box model. Surface temperatures and heat fluxes are measured with contact sensors on a sound area and these quantities are then extrapolated to nearby thermal bridges using infrared thermography. The total heat transfer coefficient, required in the heat flux extrapolation process, is monitored with a specific device. The method is validated on a full-size loadbearing wall built inside a climate chamber. The mechanical supports, holding the internal insulation system implemented on the wall, generate several thermal bridges. The ψ-values estimated by the active method are less than 20% away from steady-state measurements taken as reference. Many configurations were tested with constant and varying external temperature and the method proved its robustness to these unsteady conditions.

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Section: General Methodsmentioning

confidence: 99%

“…The inverse method is briefly presented in this section. For more information, please refer to [13]. The method is based on four main steps:…”

Section: Inverse Methods For Homogeneous Wall Characterizationmentioning

confidence: 99%

“…The order n is increased until the difference between the measurements and the fitted function stops decreasing. The choice n = 7 proved to work well [13].…”

Section: Define An Analytical Expression Of the Model Inputmentioning

confidence: 99%

Section: Choice Of Direct Modelmentioning

confidence: 99%

mentioning

confidence: 99%

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In situ measurement method for the quantification of the thermal transmittance of a non-homogeneous wall or a thermal bridge using an inverse technique and active infrared thermography

François

Ibos

Feuillet

et al. 2021

Energy and Buildings

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Bio‐based building components: A newly sustainable solution for traditional walls made of Arundo donax and gypsum

et al. 2023

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To contribute to the use of bio‐based materials in the building sector, a novel bio‐based wall panel, with a high thermal performance level, is proposed in this work. The panel is based on an ancient rural technique, widely diffused in southern Italy, which makes use of Arundo donax L. canes combined with gypsum plaster to build walls and ceilings of rural buildings. The enhancement of the thermal capacity of these panels by means of the introduction in the canes of a natural wax oleogel (WO) is proposed in this paper. A specific experimental campaign aiming at the comparison of traditional and innovative panels was carried out to assess the enhanced thermal performance of the proposed solution. The maximum value of heat flow absorbed from the panel with WO was 61.08 W/m2 around a mean panel temperature of 24°C, corresponding to the melting temperature range of the WO. The panel without WO at the same temperature absorbed an incoming heat flow of 34.64 W/m2 which is about 57% of the panel with WO. The panel with WO released at a temperature of about 27.5°C, a heat flow of 43.42 W/m2. At the same temperature of about 27.5°C, the panel without WO released a heat flow of 34.38 W/m2 which is about 80% that of the panel with WO. The results highlighted that the addition of natural WO has enhanced the thermal capacity of the panel facilitating heat dissipation through the borders. These characteristics make the panel a suitable component for internal partitions of controlled temperature zones such as residential rooms, storage food areas, livestock buildings, and where it is necessary to obtain a constant environmental temperature. In particular, the null or low toxicity of the panel's materials allows for partition use, also in hygienically safe environments.

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Estimating dynamic solar gains from on-site measured data: An ARX modelling approach

2022

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Estimation of the thermal resistance of a building wall with inverse techniques based on rapid active in situ measurements and white-box or ARX black-box models

Cited by 19 publications

References 69 publications

In situ measurement method for the quantification of the thermal transmittance of a non-homogeneous wall or a thermal bridge using an inverse technique and active infrared thermography

In situ measurement method for the quantification of the thermal transmittance of a non-homogeneous wall or a thermal bridge using an inverse technique and active infrared thermography

Bio‐based building components: A newly sustainable solution for traditional walls made of Arundo donax and gypsum

Estimating dynamic solar gains from on-site measured data: An ARX modelling approach

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