PSI - Issue 55

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2023) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 55 (2024) 143–150

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ESICC 2023 Organizers © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ESICC 2023 Organizers Abstract The European Union must enhance energy efficiency in its building stock, given that buildings account for up to 40% of the EU's energy consumption. Currently, more than 85% of buildings have been in use for over two decades, with at least 75% lacking energy efficiency. Only 10% of the building stock achieves ‘A’ or ‘B’ ratings in energy performance certificates. To meet energy efficiency standards, retrofitting exterior walls with passive techniques, such as enhancing optical properties, proves highly effective. Employing high reflectance surfaces reduces solar heat absorption, thereby lowering cooling energy use. This study examines the impact of reducing surface temperature through an external thermal insulation system with a high reflectance finishing coat during building envelope renovation in various climatic zones in Portugal. Preliminary findings indicate that high reflectance has a more substantial effect on annual heat gain for moderately insulated walls than well-insulated ones. The effect varies with maximum air temperature, especially in hot summers. A change in reflectance can improve heat gain reduction, especially considering the cost of retrofitting with insulation materials. An optimal balance between reflectance and thermal resistance is key to achieving lower surface temperatures and reducing cooling energy demands for Portuguese climates. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ESICC 2023 Organizers ESICC 2023 – Energy efficiency, Structural Integrity in historical and modern buildings facing Climate change and Circularity Improving energy efficiency in Portuguese buildings: Retrofitting façades with high reflectance finishing coat Andréa R. Souza a *, Inês Flores-Colen b , Nuno M. M. Ramos a a CONSTRUCT-LFC, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-645 Porto, Portugal b CERIS, DECivil, IST-University of Lisboa; Av. Rovisco Pais, 1049-001 Lisbon, Portugal Abstract The European Union must enhance energy efficiency in its building stock, given that buildings account for up to 40% of the EU's energy consumption. Currently, more than 85% of buildings have been in use for over two decades, with at least 75% lacking energy efficiency. Only 10% of the building stock achieves ‘A’ or ‘B’ ratings in energy performance certificates. To meet energy efficiency standards, retrofitting exterior walls with passive techniques, such as enhancing optical properties, proves highly effective. Employing high reflectance surfaces reduces solar heat absorption, thereby lowering cooling energy use. This study examines the impact of reducing surface temperature through an external thermal insulation system with a high reflectance finishing coat during building envelope renovation in various climatic zones in Portugal. Preliminary findings indicate that high reflectance has a more substantial effect on annual heat gain for moderately insulated walls than well-insulated ones. The effect varies with maximum air temperature, especially in hot summers. A change in reflectance can improve heat gain reduction, especially considering the cost of retrofitting with insulation materials. An optimal balance between reflectance and thermal resistance is key to achieving lower surface temperatures and reducing cooling energy demands for Portuguese climates. ESICC 2023 – Energy efficiency, Structural Integrity in historical and modern buildings facing Climate change and Circularity Improving energy efficiency in Portuguese buildings: Retrofitting façades with high reflectance finishing coat Andréa R. Souza a *, Inês Flores-Colen b , Nuno M. M. Ramos a a CONSTRUCT-LFC, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-645 Porto, Portugal b CERIS, DECivil, IST-University of Lisboa; Av. Rovisco Pais, 1049-001 Lisbon, Portugal Keywords: Reflectance; Finishing Coat; Surface Temperature; Heat Flux; Portugal Climate.

Keywords: Reflectance; Finishing Coat; Surface Temperature; Heat Flux; Portugal Climate.

* Corresponding author. Tel.: +351 964596 479. E-mail address: andrea.souza@fe.up.pt * Corresponding author. Tel.: +351 964596 479. E-mail address: andrea.souza@fe.up.pt

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ESICC 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ESICC 2023 Organizers

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