Thermal properties of wood: measurements by transient plane source method in dry and wet conditions

Abstract

Increasing use of wooden material in new constructions and retrofit activities push to a deeper comprehension of properties and specifically thermal properties of different wood species. On one side wooden products on the market are accompanied by few and generic information on the other side analysis of literature confirms a lack of experimental data on thermal conductivity of wood species grown in Italy. In this paper some species of softwood like spruce and larch, and hardwood, like elm, oak and ash are analysed and their thermal conductivities as a function of the equilibrium water content are evaluated by the use of a transient plane source. Results are in line with literature values and, in general, conductivity augments with water content increasing. The relationship between water content and conductivity exploited a linear behaviour for all species.

Determining thermal properties of beech and fir wood samples in longitudinal direction via modified transient plane source method

“…Sonderegger et al (2011) state that the thermal conductivity of wood is the highest in the longitudinal direction, while there is no clear consensus for the radial and tangential directions. Krištak et al (2019) report higher thermal conductivity values in the radial direction, while some authors (Peron et al 2020) do not find significant differences in the thermal conductivities of wood in the radial and tangential directions. In the oldest found research on the influence of temperature and MC on TC of wood, Kanter (1957) determined the thermal conductivity of birch using the stationary state method and determined a linear increase in TC with increasing temperature.…”

“…Harada et al (1998) determined the TC of various types of wood in the heating process using the laser flash method. Peron et al (2020) obtained the TC of oak, fir, larch, elm, and ash using the TPS method. Some authors made their own experimental setups for measuring TC.…”

Evaporation Performance of Wood‐Based Evaporator for Solar Interfacial Vapor Generation

“…After absorbing water, it still has a low thermal conductivity of about 0.17–0.20 W m −1 K −1 which can effectively prevent the heat transfer to bulk water. [ 30 ] Zhu et al [ 31 ] deposited palladium nanoparticles in the pores of natural wood, achieved efficient light absorption by the plasmonic effect, and the evaporation efficiency reached 85% at 10 sun intensities. Wu et al [ 32 ] designed an evaporator composed of natural wood coated with dopamine.…”