Lumber Convective Drying Based on Controlled Moisture Transfer

Wood drying (in particular lumber drying), which almost entirely determines the quality of wooden products, is one most complicated and energy-consuming processes in wood processing. Convective lumber, all its varieties, remains common by far. Computer modeling usually based on solving systems differential heat mass transfer equations. The methods for such systems, both analytical numerical, are well researched developed. However, important methodological issue correct formulation boundary conditions that determine process interrelated at interface (wood – moist air). convective has traditionally used type III Academician A.V. Lykov, characterized a sufficiently close correspondence between flows moving from depth interface. This described value so-called Bio criterion. A computational experiment was carried out to verify these assumptions. It enabled possible controllability moisture removal during low-temperature conventional using modes three-step stepless structure. Besides this, influence dynamics internal stresses also studied. results have shown modes, hand, offer significant improvement with practically no loss capacity, other better controllability. previously conducted mentioned studies made it propose general principles then patent system automatic control drying, fundamentally different known systems. controls adjusting ratio external transfer, rather than media parameters chamber. limited control: cannot fully stabilize values use maintains certain balance ensures required completely eliminates occurrence defects. For citation: Gorokhovsky A.G., Shishkina E.E., Agafonov A.S. Lumber Drying Based Controlled Moisture Transfer. Lesnoy Zhurnal [Russian Forestry Journal], 2022, no. 1, pp. 166–172. DOI: 10.37482/0536-1036-2022-1-166-172