The effect offan speed on the drying process of timber in kiln driers. The study investigated the effect of fan speed on air velocity in a stack of timber in selected types of kiln driers. The trials were conducted under technical scale conditions. The values and dispersion of air velocity were measured in the stack were measured, depending on fan speed reduced in the final stage of the drying process. Changes in fan speed were evaluated on the basis of the time of drying, energy consumption to drive fans, as well as the dispersion of final moisture content in the stack, the dispersion of moisture content in the cross-section. The study included drying of hardwood and softwood timber. On the basis of obtained results it was found that reducing fan speed results in a decrease in both air velocity in the stack and electric energy consumption used to drive fans, while no significant extension of drying time or deterioration of drying quality were observed.
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