Vacuum drying of wood with radiative heating: I. Experimental procedure



Experimental results for the vacuum drying of wood with radiative heating are presented. In particular, the temperature and pressure measurements at different locations within the board are provided, as are the overall drying curves. The heat source is such that the temperature at the end of the process remains low (≈150°C), and under these conditions, the drying process resembles convective drying with superheated steam. Further important details concerning the internal transfer mechanisms that are induced by this drying process can be pointed out by comparing results for sapwood and heartwood of different species (Picea abies, Abies alba and Fagus silvatica). These extensive experimental data sets will be used in Part II of this work for the purposes of assessing the accuracy and predictive ability of two different drying models and for analyzing the vacuum drying process further at a fundamental level. © 2004 American Institute of Chemical Engineers AIChE J, 50:97–107, 2004