Mathematical modelling and experimental investigation of dehumidifier drying of radiata pine timber¿
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Universidad del Bío Bío
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A dynamic kiln-wide wood drying model was developed previously to solve the integral form ofthe unsteady-state mass, momentum and energy balance equations in the air side. For the wood side,an empirical model, characteristic drying curve, for the internal moisture movement is used, whichwas obtained for low and medium temperature drying of Pinus radiata, with a medium velocity of 1.4-4.1 m s 1. As part of the research programme to improve the design and control of dehumidifier wooddrying kilns, the wood drying model has been assessed using the experimental data measured underdrying conditions similar to those in dehumidifier kiln. It is noted that close agreement between themodelled results and the experimental data can be obtained for Pinus radiata drying processes with amedium air velocity (< 5 m s 1). However, larger discrepancy between the modelled results and themeasured data has been observed with a higher velocity (8 m s 1). To solve this problem a newcharacteristic drying curve, based on a two-zone diffusion model, has been used in the kiln-wide wooddrying model and more accurate results have been obtained.
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