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Energy performance of a prefabricated timber-based retrofit solution applied to a pilot building in Southern Europe

https://research.thinkwood.com/en/permalink/catalogue3158
Year of Publication
2022
Topic
Energy Performance
Material
CLT (Cross-Laminated Timber)
Application
Walls
Author
Evola, Gianpiero
Costanzo, Vincenzo
Urso, Alessandra
Tardo, Carola
Margani, Giuseppe
Organization
University of Catania
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Walls
Topic
Energy Performance
Keywords
Timber-based Retrofit
Thermal Insulation
Thermal Bridges
Dynamic Simulations
Space Heating
Space Cooling
Research Status
Complete
Series
Building and Environment
Summary
This paper advances the current knowledge on the use of prefabricated timber-based panels in building renovation by analyzing in detail the thermal performance achieved by two different renovation solutions developed in the framework of the ongoing e-SAFE H2020 project. In particular, these solutions apply to the external walls of a pilot building located in Catania (Italy) as a double-skin façade that increases also the seismic performance of the building. The dynamic energy simulations reveal that the proposed solutions allow reducing the energy need for space heating and space cooling by 66% and 25%, respectively. One further finding is that, although the proposed timber-based renovation solutions are not affected by mould growth and surface condensation risk, the impact of thermal bridges cannot be neglected after renovation. Indeed, despite the strong reduction in the magnitude of heat losses due to thermal bridges (from 667 W·K-1 down to 213.1 W·K-1), they still account for about 21% of total heat losses after the renovation. This suggests that more complex and expensive technological solutions should be introduced to further reduce heat losses in some thermal bridges, but a cost-benefit analysis should justify their adoption. Finally, overlooking these thermal bridges in dynamic energy simulations can lead to an average underestimation of the heating and cooling energy demand after the renovation, by about 16% and 5% respectively. In this regard, the paper proposes a simplified yet reliable approach to include heat transfer through thermal bridges in the post-processing stage of dynamic energy simulations under thermostatic control.
Online Access
Free
Resource Link
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Energy, Seismic, and Architectural Renovation of RC Framed Buildings with Prefabricated Timber Panels

https://research.thinkwood.com/en/permalink/catalogue2503
Year of Publication
2020
Topic
Seismic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems

Moisture-Related Risks in Wood-Based Retrofit Solutions in a Mediterranean Climate: Design Recommendations

https://research.thinkwood.com/en/permalink/catalogue3259
Year of Publication
2022
Topic
Moisture
Author
Urso, Alessandra
Costanzo, Vincezo
Nocera, Francesco
Evola, Gianpiero
Organization
University of Catania
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Topic
Moisture
Keywords
Hygrothermal Simulations
Moisture-related Risks
Wood-based Envelope Solutions
Thermal Insulation
Research Status
Complete
Series
Sustainability
Summary
Nowadays, advanced hygrothermal simulation tools are available and they are widely used to predict moisture-related risks in building components, such as mold growth and increased conductive heat losses. This paper takes advantage of these capabilities to analyze moisture-related risks in the innovative wood-based retrofit solutions, developed in the ongoing H2020 “e-SAFE” project. In particular, simulations carried out through the Delphin software for the warm Mediterranean climate of Catania (Italy) allowed assessing the effectiveness of several insulating materials used in the wall assembly and the moisture-related performance determined by adopting either a waterproof membrane or a vapor barrier in convenient positions. The results show that the solutions with highly permeable and highly moisture-capacitive insulation (e.g., wood fiber) are mold free, but at the expense of increased heat losses by up to 12%, compared to dry materials). In some circumstances, foam glass or extruded polyurethane could be preferable, due to their high resistance to mold growth and their flat sorption curve. The vapor-open waterproof membrane applied to the outer side of the insulation is suggested, while a vapor barrier on the outer side of the existing wall worsens mold-related issues.
Online Access
Free
Resource Link
Less detail