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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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Wetting and Drying Performance and On-site Moisture Protection of Nail-Laminated Timber Assemblies

https://research.thinkwood.com/en/permalink/catalogue1871
Year of Publication
2016
Topic
Moisture
Material
NLT (Nail-Laminated Timber)
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Author
Wang, Jieying
Organization
FPInnovations
Publisher
BC Housing Research Centre
Year of Publication
2016
Format
Report
Material
NLT (Nail-Laminated Timber)
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Topic
Moisture
Keywords
Wetting
Drying
Sheathing
Moisture Protection
Space Heating
Research Status
Complete
Summary
In recent years, nail-laminated timber has been increasingly used in wood construction, including both heavy timber non-residential buildings (for floors or roofs) and light wood-frame residential buildings (such as elevator shafts). However, such built-up assemblies, tend to have high wetting and low drying potential and are susceptible to moisture-related issues during the construction. This study evaluates moisture protection by the sheathing or membrane for nail-laminated timber assemblies during on-site construction in British Columbia. Severe wetting will lead to elevated moisture content. Therefore, the best practice when working with nail-laminated timber is to avoid wetting.
Online Access
Free
Resource Link
Less detail