| Title: | Experimental investigations of internal macro-scale convection in the loose-fill wood fiber insulation layer of a full-scale wall element |
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| Authors: | ID Veit, Martin (Author)
ID Johra, Hicham (Author)
ID Rask, Nikolaj (Author)
ID Roesgaard, Simon M. (Author)
ID Jensen, Rasmus Lund (Author) |
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| Files: |  URL - Source URL, visit https://doi.org/10.1016/j.enbuild.2025.116646
 PDF - Presentation file, download (10,19 MB)
MD5: 7B2025C1618A0819DD2E41987BD517EC
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | With increasing restrictions on the energy efficiency of buildings, thicker insulation layers are installed in new and refurbished buildings to reduce heat losses. Previous studies have indicated that internal macro-scale convection cells can occur in thick porous insulation layers, decreasing the thermal performance of the envelope component. The focus of previous studies has been on horizontal insulation layers, most often composed of glass wool. Therefore, there is a lack of empirical data for loose-fill insulation and, in particular, bio-based materials, which have the potential of being more sustainable than conventional ones. The present investigation of this paper looks at the possibility of internal macro-scale convection inside loose-fill wood fiber insulation in a full-scale vertical wall element, with the modified Rayleigh number in the current investigation being between 20 and 45 and exhibiting internal convection in all cases. The experimental results show good agreement in terms of heat flux and temperature distribution with numerical simulations where the macro-scale convection is modelled explicitly. It also indicates that internal macro-scale convection can be modelled with existing building physics simulation tools, such as COMSOL. Finally, the internal macro-scale convection increases the effective U-value by up to 90 % for the highest temperature difference in steady-state conditions. This effect appears to diminish under dynamic boundary conditions, with a calculated effective U-value being within the uncertainty of the steady-state case with the lowest temperature difference, indicating that it might be less influential under real conditions. |
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| Keywords: | thermal performance, internal convection, performance gap, insulation materials |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 28.10.2025 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2026 |
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| Number of pages: | str. 1-14 |
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| Numbering: | Vol. 350, [article no.] 116646 |
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| PID: | 20.500.12556/DiRROS-24127  |
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| UDC: | 699.8 |
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| ISSN on article: | 1872-6178 |
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| DOI: | 10.1016/j.enbuild.2025.116646 |
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| COBISS.SI-ID: | 256038147 |
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| Copyright: | © 2025 The Author(s) |
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| Note: |
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| Publication date in DiRROS: | 17.11.2025 |
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| Views: | 109 |
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| Downloads: | 56 |
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