Numerical and experimental estimation of building wall heat flux in presence of moisture transfer

Abstract Insulating building envelope is an efficient way to increase building energy efficiency and minimize greenhouse gas emissions related to heating. After building refurbishment, on-site measurements are suitable for verifying the actual thermal transmission properties of plane building compon...

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Bibliographic Details
Published in:Journal of physics. Conference series 2023-12, Vol.2654 (1), p.12121
Main Authors: Assaad, M El, Colinart, T, Lecompte, T
Format: Article
Language:English
Subjects:
Building components
Building envelopes
Emissions
Greenhouse gases
Heat flux
Heat transfer
Heat transmission
Insulation
Latent heat
Moisture effects
Physics
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Summary:Abstract Insulating building envelope is an efficient way to increase building energy efficiency and minimize greenhouse gas emissions related to heating. After building refurbishment, on-site measurements are suitable for verifying the actual thermal transmission properties of plane building components. For instance, the standard ISO 9869-1 describes a HFM method based on the measurement of surface heat flux with heat flow sensor (HFS). This method has been extensively investigated in the literature and successfully applied on vapor tight building walls. Nevertheless, hygroscopic building insulation materials (like biobased materials) are increasingly used, and heat transfer are coupled to moisture transfer within the wall. In this case, the HFS acts as a vapor barrier: it modifies the local moisture transfer and the associated latent heat flux. In this view, this study aims to clarify what it is measured with HFS in presence of moisture transfer. The question is first treated by numerical simulation of heat and moisture transfer within hygroscopic building wall. Then, experiments are carried out on hygroscopic building insulation where the moisture effects are exaggerated.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2654/1/012121