Bayesian uncertainty analysis of inversion models applied to the inference of thermal properties of walls

Demeyer, Séverine; Sant, Véronique Le; Koenen, Alain; Fischer, Nicolas; Waeytens, Julien; Bouchié, Rémi

doi:10.1016/j.enbuild.2021.111188

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Beyond the purview of the PASLINK project, several research works have determined the thermal properties of building components. For example, (Iglesias et al, 2018) and (Demeyer et al, 2021) both propose approaches based on Bayesian inference and uncertainty analysis to estimate the thermal properties of walls. They use simplified heat transfer models and in-situ measurements of temperature and heat flux to establish the relationship with the unknown thermal properties.…”

Section: Introductionmentioning

confidence: 99%

Experimental method for estimating the effect of solar radiation on the inner surface heat flux of opaque building envelope elements

Uriarte,

Erkoreka,

Jimenez

et al. 2024

Journal of Building Physics

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There still exists a considerable difference when comparing the real and the design energy consumption of buildings. The difference between the design and the real building envelope energy performance is one of its main reasons. The building envelope can be characterised through the individual characterisation of its different building envelope components such as opaque walls or windows. Therefore, the estimation of parameters such as their transmission heat transfer coefficient (UA) and their solar aperture (gA) is usually implemented. Although building components have been analysed over the years, the thermal characteristics of buildings have mainly been estimated through steady-state laboratory tests and simplified calculation/simulation procedures based on theoretical data. The use of inverse modelling based on registered dynamic data has also been used; however, unfortunately, the models used tend to significantly simplify or neglect the solar radiation effect on the inner surface heat flux of opaque building envelope elements. Therefore, this work presents an experimental, dynamic and inverse modelling method that accurately models non-linear phenomena through the use of a user-friendly simulation programme (LORD). The method is able to analyse in detail the effect of the solar radiation on the inner surface heat flux of opaque building envelope elements, without the necessity of knowing their constructive details or thermal properties. The experiment is performed in a fully monitored test box, where different models are tested with different opaque walls to find the best fit. Finally, the solar irradiance signal is removed from the best models so as to accurately quantify the weight of the solar radiation on the inner surface heat flux of each wall for two extreme periods, one for sunny summer days and other for cloudy winter days.

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Section: Introductionmentioning

confidence: 99%

Experimental method for estimating the effect of solar radiation on the inner surface heat flux of opaque building envelope elements

Uriarte,

Erkoreka,

Jimenez

et al. 2024

Journal of Building Physics

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“…The need therefore currently exists to enable monitoring the actual performance of insulating materials, over the course of seasons. The many projects underway in France targeting envelope performance monitoring (REHAFUTUR [9], ISABELE [10], RESBATI [11]), as is the case in other countries [12,13], reveal the societal importance behind this focus on the in situ thermal behavior of building envelopes. The attention paid to bio-sourced materials in the construction industry has grown over the past few decades, as their use has become more widespread across the globe [14].…”

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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Measurement prototype for fast estimation of building wall thermal resistance under controlled and natural environmental conditions

Feuillet

Waeytens

et al. 2022

Energy and Buildings

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Bayesian uncertainty analysis of inversion models applied to the inference of thermal properties of walls

Cited by 3 publications

References 24 publications

Experimental method for estimating the effect of solar radiation on the inner surface heat flux of opaque building envelope elements

Experimental method for estimating the effect of solar radiation on the inner surface heat flux of opaque building envelope elements

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

Measurement prototype for fast estimation of building wall thermal resistance under controlled and natural environmental conditions

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