Application of Hart's computer simulation to the drying of 2-inch thick Douglas-fir heartwood lumber Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2v23vz838

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  • The purpose of this study was to compare the drying curves of 2-inch thick Douglas-fir heartwood boards as predicted by a computer simulation by C. A. Hart (1983) with those actually observed in experimental kiln runs. The moisture gradients within test boards were also simulated by the computer program and actually monitored by a thermo-moisture meter constructed by J. Forrer (1984). The measurements of moisture gradients in single boards and across a stack of boards were made in a small experimental kiln and in an industrial kiln respectively using a common kiln schedule. In spite of correctable temperature effects on the monitored D.C. resistance values, Forrer's thermo-moisture meter performed well in the determination of moisture changes in different depths of test boards and in reflecting warm-up time and maximum moisture gradients. Moisture gradients in single boards or between boards in a stack, as predicted by the simulation program, came close to observed values. After adjustments of computer inputs, the simulated drying curves came into very good agreement with the actual drying curves. The same was true for moisture gradients predicted by the simulation and monitored by the thermo-moisture meter. Thus, Hart's computer simulation originally developed for and verified on white oak lumber worked for the drying of Douglas-fir heartwood lumber as well. Both the simulation program and the thermo-moisture meter appear to be excellent tools for studying the drying behavior of wood.
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