Thermal Conductivity Of Hardwood

2 moisture content of the wood.

Thermal conductivity of hardwood. Thus light dry woods are better insulators. The heat conductivity of wood is dependent on a number of factors of varying degrees of importance. Thermal properties 3 15 conductivity 3 15 heat capacity 3 17 thermal diffusivity 3 17 thermal expansion coefficient 3 21 electrical properties 3 21 conductivity 3 21 dielectric constant 3 22. The thermal conductivity of solid wood and presumably wood based composite materials is known to increase with specific gravity dry weight volume at test moisture content temperature and extractive content wood handbook 2010.

Thermal conductivity declines as the density of the wood decreases. Thermal conductivity of pine a thermal conductivity of 0 1213 w mk for pine was the product of the hfm measurement. This property makes wood suitable for heating purposes but is disadvantageous for its technical utilization. For example the thermal conductivity of pine in the direction of the grain is 0 22 w moc and perpendicular to the grain 0 14 w moc.

When exposed to sufficiently high temperatures wood burns. The thinner and denser the wood the quicker the heat up time. Thermal conductivity is highest in the axial direction and increases with density and moisture content. Timber is an excellent building material.

Presently wood has become an alternative to brick in the construction of homes. The low thermal conductivity of wood means that it can act as an effective insulator to protect the inhabitants of the building from extreme environmental temperatures. Hardwood lumber in which annual rings form angles of 30. For example wool carpet rates a maximum r value of 2 1 while other types of carpet can rate as low.

The moisture content and density are major factors. This change in construction material can be attributed to the thermal conductivity of softwoods being approximately 1 7 that of brick. Carpet particularly wool and shag varieties provides the best r values among all standard flooring choices. However because marble tiles are usually twice as thick as ceramic tiles they offer greater protection against thermal conductivity.

3 direction of heat flow with respect to the. Thermal conductivity when installing an underfloor heating system with a wooden floor thermal conductivity is an important factor to think about. 1 density of the wood. Wood is also a popular fuel source as it burns slowly and predictably.

In the direction of the grain the thermal conductivity of wood is about twice what it is perpendicular to the grain.