Wood and its useful properties
Wood is a remarkable material and therefore has remarkable properties. They are shown in Table 1. In addition to the well-known thermophysical properties of five basic and to a large extent also characteristic building materials, the last column shows the coefficient of thermal conductivity and in μm2 / s. It expresses the ability of the heat wave to spread in the building material to which the coefficient relates. Among the five representatives of different material circuits (metal, insulation, concrete, masonry, wood), wood has the lowest coefficient a = 0.219 μm2 / s.
In other words, the heat wave spreads the slowest through wood. A look at the table further shows that the temperature wave spreads the fastest through aluminum with a = 113 μm2 / s. Both materials are used for the production of lamellas of shading technology. However, the speed of spreading of a temperature wave is not the same as the propagation, more precisely the intensity of heat transfer through a solid. This is determined by the thermal conductivity coefficient lambda, λ. Of the five materials, aluminum with the highest coefficient λ = 273 W / (mK) is the best, followed by concrete, wood, TI-blocks and the last is thermal insulation, which conducts heat the least.