Publicação
Converting Non-homogeneous Masonry Walls into 1D Hygrothermal Models
| Resumo: | This study addresses the complexities in refurbishing the extensive 20th-century building stock, driven by the European Renovation Wave initiative. To develop more effective conservation strategies, numerical simulations assess the hygrothermal performance of exterior walls, ensuring compatibility between new and existing materials and aiding energy modeling. A key challenge is accurately representing material discontinuities and heterogeneities in one-dimensional (1D) models of heat and moisture transfer. Many existing 20th-century buildings feature masonry walls with ceramic bricks and mortar coatings, often in double-wall systems with air-filled or insulated cavities. Instead of solid bricks, perforated ones (with holes) were commonly used. This study investigated the downscaling of inhomogeneous two-dimensional (2D) wall sections into homogeneous 1D representations. Simulations using WUFI 2D examined double-wall geometries with various configurations: bricks with and without holes explicitly modeled, mortar joints, air-filled or insulated cavities, and conventional versus thermally enhanced mortar coatings. Material properties were sourced from literature and databases, with a focus on modeling North-facing 20th-century buildings in Lisbon. Differences were more pronounced between assemblies with and without represented holes than between different geometries within each system. Thus, simplified geometries proved acceptable for the studied case by removing horizontal mortar joints and ceramic interlayers, while maintaining air voids. This approach yields more accurate results than assigning unified material properties (i.e., using one set of properties for both ceramic interlayers and air voids). This study proposes a methodological approach for future energy modeling optimized under more intense wind-driven rain conditions. |
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| Autores principais: | Bersch, Jéssica D. |
| Outros Autores: | Kraniotis, Dimitrios; Coelho, Guilherme B.A.; Masuero, Angela B.; Molin, Denise Dal; Flores-Colen, Inês |
| Assunto: | 20-century buildings Hygrothermal performance Inhomogeneous Assembly Masonry walls One- and Two-Dimensional Model Civil and Structural Engineering |
| Ano: | 2025 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso embargado |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | This study addresses the complexities in refurbishing the extensive 20th-century building stock, driven by the European Renovation Wave initiative. To develop more effective conservation strategies, numerical simulations assess the hygrothermal performance of exterior walls, ensuring compatibility between new and existing materials and aiding energy modeling. A key challenge is accurately representing material discontinuities and heterogeneities in one-dimensional (1D) models of heat and moisture transfer. Many existing 20th-century buildings feature masonry walls with ceramic bricks and mortar coatings, often in double-wall systems with air-filled or insulated cavities. Instead of solid bricks, perforated ones (with holes) were commonly used. This study investigated the downscaling of inhomogeneous two-dimensional (2D) wall sections into homogeneous 1D representations. Simulations using WUFI 2D examined double-wall geometries with various configurations: bricks with and without holes explicitly modeled, mortar joints, air-filled or insulated cavities, and conventional versus thermally enhanced mortar coatings. Material properties were sourced from literature and databases, with a focus on modeling North-facing 20th-century buildings in Lisbon. Differences were more pronounced between assemblies with and without represented holes than between different geometries within each system. Thus, simplified geometries proved acceptable for the studied case by removing horizontal mortar joints and ceramic interlayers, while maintaining air voids. This approach yields more accurate results than assigning unified material properties (i.e., using one set of properties for both ceramic interlayers and air voids). This study proposes a methodological approach for future energy modeling optimized under more intense wind-driven rain conditions. |
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