Short time non-destructive evaluation of thermal performances of building walls by studying transient heat transfer

Yang, Yingying; Wu, Tingting Vogt; Sempey, Alain; Dumoulin, Jean; Batsale, Jean‐Christophe

doi:10.1016/j.enbuild.2018.12.002

Cited by 18 publications

(6 citation statements)

References 12 publications

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“…The methods are illustrated on the example of a simple R-C gray-box model. Yang et al [74] used a heat flux-temperature deconvolution method to estimate a wall thermal resistance from reconstruction of the unit-step response. Other studies rather used "white-box" models.…”

Section: State Of the Artmentioning

confidence: 99%

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

Ibos

Feuillet

et al. 2020

Energy and Buildings

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Section: State Of the Artmentioning

confidence: 99%

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

Ibos

Feuillet

et al. 2020

Energy and Buildings

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“…When examining the concrete in old buildings, the used concrete might not be documented, and its properties must then be determined on-site or by taking samples. A series of recent studies and publications was focused on the determination of the thermal properties of an entire wall as part of an existing building to evaluate the heat energy consumption [1][2][3]. The reported methods are regarding the entire thickness of the inspected wall in its actual state with moisture and degradation of materials, but last for several hours or even days due to the large thermal inertia.…”

Section: Introductionmentioning

confidence: 99%

“…Active thermography is generally considered as a rather inexpensive and fast method with high flexibility concerning the sample size, which can in principle be conducted onsite on buildings [1,3,20]. Therefore, this work examines the feasibility of active thermography for deducing the thermal parameters of concrete, but in a short-term mode.…”

Section: Introductionmentioning

confidence: 99%

Determination of Thermal Parameters of Concrete by Active Thermographic Measurements

2022

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The knowledge of the thermal parameters of a particular concrete is essential for thermal design of a building, but also could help to identify and assess the state of a concrete structure. Active thermography has the potential to be applied onsite and to provide a fast investigation of thermal properties. In this work, three different concrete samples were investigated by active thermography in reflection and in transmission setup. It was found that this method yields the same results without direct contact as the Transient Plane Source (TPS) method as an established inspection tool.

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“…Thermal properties can be determined by relying on inversion methods, built around a 1D model of the conductive exchanges taking place through the wall. The quadrupole method [27,28] is especially well adapted to simple geometries. This method relies on an analysis within the Laplace space or on the temperature and flow evolution frequencies and moreover serves to determine the wall's total thermal capacities and conductance.…”

Section: Introductionmentioning

confidence: 99%

Active Thermal Method Applied to the In Situ Characterization of Insulating Materials in a Wall

et al. 2021

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An in situ estimation of the thermal properties of bio-sourced building wall insulation components is of critical importance in improving both the energy efficiency of buildings and the development of construction materials with a smaller environmental footprint. Depending on weather conditions, passive methods are not always feasible; they require time to conduct lengthy testing and may lead to significant uncertainties. This article presents an active method based on power dissipation via flat electrical resistance. The method can be implemented regardless of outdoor weather conditions and is suitable for walls with high overall thermal resistance for which the small average component of the through flow is difficult to estimate. Measurements are conducted of both wall input flows and temperatures. An inverse method, derived from a finite difference model of 1D transfers along with a multi-objective approach, enables the characteristics of a two-material assembly to be identified. A multi-objective method was chosen to solve the problems of high correlation between the thermal parameters of the model. However, the method requires the use of two temperature sensors integrated inside the wall. Following a laboratory validation phase on a PVC/plasterboard assembly, the method is implemented on an actual wall. A coating/hemp concrete assembly is also characterized as part of this work program. The thermal conductivity of the hemp concrete block was estimated at 0.12 W m−1 K−1 and is consistent with values found in the literature.

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Short time non-destructive evaluation of thermal performances of building walls by studying transient heat transfer

Cited by 18 publications

References 12 publications

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

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

Determination of Thermal Parameters of Concrete by Active Thermographic Measurements

Active Thermal Method Applied to the In Situ Characterization of Insulating Materials in a Wall

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