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7 records – page 1 of 1.

Experimental Verification of Thermal Insulation in Timber Framed Walls

https://research.thinkwood.com/en/permalink/catalogue3007
Year of Publication
2022
Topic
Moisture
Application
Walls
Author
Michálková, Daniela
Durica, Pavol
Organization
University of Zilina
Editor
Pavlik, Zbyšek
Publisher
MDPI
Year of Publication
2022
Format
Journal Article
Application
Walls
Topic
Moisture
Keywords
Timber Framed
Relative Humidity
Thermal Conductivity
Material Properties
Research Status
Complete
Series
Materials
Summary
Current environmental crisis calls for sustainable solutions in the building industry. One of the possible solutions is to incorporate timber-framed constructions into designs. Among other benefits, these structures are well established in many countries, originating in traditional building systems. This paper focuses on experimental timber-frame walls. Different wall assemblies vary in thermal insulation materials and their combinations. We investigated ten experimental wall structures that have been exposed to natural external boundary conditions since 2015. The emphasis was on their state in terms of visual deterioration, mass moisture content, and thermal conductivity coefficient. We detected several issues, including defects caused by inappropriate realization, causing local moisture increase. Material settlement in loose-fill thermal insulation was another issue. Concerning was a significant change in the thermal conductivity of wood fiber insulation, where the current value almost doubled in one case compared to the design value determined by the producer.
Online Access
Free
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Fire Performance of Metal-Free Timber Connections

https://research.thinkwood.com/en/permalink/catalogue2186
Year of Publication
2015
Topic
Fire
Connections
Material
LVL (Laminated Veneer Lumber)
CLT (Cross-Laminated Timber)
Other Materials
Application
Wood Building Systems
Beams
Columns
Trusses

Heat Transfer Tests on EPS Material and Massive Timber Wall Component

https://research.thinkwood.com/en/permalink/catalogue2224
Year of Publication
2018
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Application
Walls

Hygrothermal Properties of Cross Laminated Timber Panels

https://research.thinkwood.com/en/permalink/catalogue2307
Year of Publication
2017
Topic
Moisture
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
Application
Walls
Wood Building Systems

Thermal conductivity of engineered bamboo composites

https://research.thinkwood.com/en/permalink/catalogue3031
Year of Publication
2016
Topic
Energy Performance
Material
Other Materials
Author
Shah, Darshil U.
Bock, Maximilian C. D.
Mulligan, Helen
Ramage, Michael H.
Organization
University of Cambridge
Publisher
Springer
Year of Publication
2016
Format
Journal Article
Material
Other Materials
Topic
Energy Performance
Keywords
Thermal Properties
Thermal Conductivity
Engineered Bamboo Composites
Research Status
Complete
Series
Journal of Materials Science
Summary
Here we characterise the thermal properties of engineered bamboo panels produced in Canada, China, and Colombia. Specimens are processed from either Moso or Guadua bamboo into multi-layered panels for use as cladding, flooring or walling. We utilise the transient plane source method to measure their thermal properties and confirm a linear relationship between density and thermal conductivity. Furthermore, we predict the thermal conductivity of a three-phase composite material, as these engineered bamboo products can be described, using micromechanical analysis. This provides important insights on density-thermal conductivity relations in bamboo, and for the first time, enables us to determine the fundamental thermal properties of the bamboo cell wall. Moreover, the density-conductivity relations in bamboo and engineered bamboo products are compared to wood and other engineered wood products. We find that bamboo composites present specific characteristics, for example lower conductivities—particularly at high density—than equivalent timber products. These characteristics are potentially of great interest for low-energy building design. This manuscript fills a gap in existing knowledge on the thermal transport properties of engineered bamboo products, which is critical for both material development and building design.
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Free
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Thermal Conductivity Values for Laminated Strand Lumber and Spruce for Use in Hybrid Cross-laminated Timber Panels

https://research.thinkwood.com/en/permalink/catalogue1861
Year of Publication
2017
Topic
Moisture
Material
LSL (Laminated Strand Lumber)
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Author
Tripathi, Jaya
William Rice, Robert
Publisher
North Carolina State University
Year of Publication
2017
Format
Journal Article
Material
LSL (Laminated Strand Lumber)
CLT (Cross-Laminated Timber)
Application
Walls
Wood Building Systems
Topic
Moisture
Keywords
Spruce
Specific Gravity
Moisture Content
Thermal Conductivity
Research Status
Complete
Series
BioResources
Summary
This study examined the thermal conductivity as a function of specific gracity and moisture content for laminated strand lumber (LSL) and red spruce. As part of a larger study of heat and mass transfer in cross-laminated timber panels using laminate comprised of both LSL and spruce, the authors measured the thermal conductivity at four moisture content levels. The results showed that the LSL had a higher thermal conductivity value across the entire moisture content range tested. The average difference was just over 8% and the range for both LSL and spruce was from 0.081 W /m-K to 0.126 W /m-K. Comparisons with published solid wood thermal conductivity values across the range were good. There were no reported values of LSL thermal conductivity at various moisture content levels.
Online Access
Free
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Thermophysical properties of balsa wood used as core of sandwich composite bridge decks exposed to external fire

https://research.thinkwood.com/en/permalink/catalogue3073
Year of Publication
2022
Topic
Fire
Application
Decking
Author
Vahedi, Niloufar
Tiago, Carlos
Vassilopoulos, Anastasios P.
Correia, João R.
Keller, Thomas
Organization
École Polytechnique Fédérale de Lausanne (EPFL)
Universidade de Lisboa
Publisher
Elsevier
Year of Publication
2022
Format
Journal Article
Application
Decking
Topic
Fire
Keywords
Balsa Wood
Effective Thermophysical Properties
Thermal Conductivity
Specific Heat Capacity
Coefficient of Thermal Expansion
Charring Temperature
Charring Rate
Research Status
Complete
Series
Construction and Building Materials
Summary
The load-bearing performance of sandwich bridge decks comprising a balsa core and fiber-reinforced polymer composite face sheets exposed to fire is a main concern regarding the application of these deck systems. In order to obtain the thermal responses of the balsa core exposed to fire, the temperature-dependent values of thermal conductivity and specific heat capacity are required. Furthermore, information about the char depth and charring rate and the temperature-dependent coefficient of thermal expansion is also needed for the subsequent thermomechanical modeling. In the current study, the effective thermal conductivity and specific heat capacity of balsa up to 850 °C were obtained from one-dimensional transient heat transfer models and experimental data using an inverse heat transfer analysis. The results showed that both properties depend significantly on the stages of combustion, direction of heat flow (in the tracheid or transverse direction) and density. Moreover, charring temperatures and rates were obtained, again as a function of direction and density. Finally, the coefficient of thermal expansion was measured in the transverse direction during evaporation and pyrolysis.
Online Access
Free
Resource Link
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7 records – page 1 of 1.