In a temperature less than 0 C, wood may start to crack as water in the cell lumens expands as it freezes. The average specific heat value of pine and spruce at +0 – 100 C is 2,300 J/kgoC. The relationship between the thermal expansion coefficients and moisture contraction coefficients of wood in different directions relative to the grain is in the same class in terms of size. AddressPuuinfo Ltd. Snellmaninkatu 13, 00170 Helsinki, Finlandwww.puuinfo.fi, Emailinfo@puuinfo.fiSee personal email addresses here. The heat capacity of pine is almost the same as that of bricks, although the density of wood compared to bricks is only 1/3. 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. The average specific heat value of pine and spruce at +0 – 100 C is 2,300 J/kgoC. As the temperature of wood decreases, its strength usually increases. In the direction of the grain, the thermal conductivity of wood is about twice what it is perpendicular to the grain. An increase in moisture improves the specific heat of the wood, because the specific heat of the water is greater than that of the wood. The thermal expansion of wood in the direction of the grain is very little. The heat storing capacity of wood depends on its density, moisture content, temperature and the direction of the grain. Because of good heat capacity, a heavy-duty log wall is a relatively good external wall structure, although the heat insulation capacity of mineral wool, for example, compared to the thermal conductivity of wood is about three times as great. In the radial and tangential directions, temperature movements are much greater. The thermal conductivity of wood is relatively low because of the porosity of timber. temperature range of 0 °C to 100 °C and average specifi c heat capacity of dry wood substance in a temperature range of. An increase in moisture improves the specific heat of the wood, because the specific heat of the water is greater than that of the wood. Increasing the moisture in the wood also increases its thermal conductivity. Strong wood from the northern coniferous forest belt, Comparison of properties with North American and Japanese wood, Properties and benefits of nordic spruce and pine, Standard sizes: thicknesses, widths and lengths, Most common uses for quality classes of sawn timber, Uniform recommendations for Finnish large wooden buildings, Structural details of Finnish log construction, The effects of wooden surfaces as heat stabiliser, Scientific data on the health effects of pine and spruce, The use of wood can be considerably increased, Carbon is bound in wood structures for a long time, Wood product production produces more energy than it consumes, Timber construction as an enabler of low-carbon property development, y-merkki_logo_vaaka_englanti_nega_rgb.png, suomalaistapalvelua_englanti_nega_rgb.png. Repeated variation in temperature decreases the strength of wood. The heat storing capacity of wood depends on its density, moisture content, temperature and the direction of the grain. Thermal conductivity declines as the density of the wood decreases.