Influence of Boundary Conditions on the Estimation of Thermal Properties in Insulated Building Walls

The objective of this study is to evaluate the ability of inverse techniques to estimate the resistance and the capacity of a highly insulated multilayer wall under real weather conditions. The wall is equipped with temperature sensors inside and on its inner and outer surfaces, and the boundary con...

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Bibliographic Details
Published in:Buildings (Basel) 2024-12, Vol.14 (12), p.3706
Main Authors: Rendu, Manon, Le Dréau, Jérôme, Salagnac, Patrick, Doya, Maxime
Format: Article
Language:English
Subjects:
Absorptivity
Boundary conditions
building envelope
Case studies
Convective heat transfer
Energy consumption
Heat transfer
Heat transfer coefficients
Identification
inverse methods
Long wave radiation
Methods
modelling
Multilayers
Parameter identification
Parameter sensitivity
Parameter uncertainty
Performance evaluation
Physical properties
Plywood
Radiation
Resistance thermometers
Sensitivity analysis
Sensors
Temperature sensors
Thermal capacity
Thermal properties
Thermal resistance
Thermodynamic properties
walls thermal transmittance
Weather
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Summary:The objective of this study is to evaluate the ability of inverse techniques to estimate the resistance and the capacity of a highly insulated multilayer wall under real weather conditions. The wall is equipped with temperature sensors inside and on its inner and outer surfaces, and the boundary conditions have been measured over a 14-day period. Uncertainties on various parameters of the model are evaluated, including internal and external convective heat transfer coefficients (±20% and ±7 W.m-².K−1 respectively), external long-wave heat transfer coefficient (±0.15 W.m−2.K−1) and solar absorption coefficient (±0.06). A sensitivity analysis demonstrated the high correlation with some parameters defining the thermal performance of the walls (thermal resistance or capacity). A solution is proposed to limit the number of identified parameters, while allowing the identification of the thermal resistance and the thermal capacity of the walls. There are two cases: either the weather conditions are accurately measured (temperature, short- and long-wave radiation) and the thermal characteristics can be assessed, or intrusive sensors are installed, and the thermal characteristics can be evaluated more accurately.
ISSN:2075-5309
2075-5309
DOI:10.3390/buildings14123706