Effect of temperature and testing position to heat absorption and temperature increasing rate during Eucalyptus pellita wood heat treatment

Eucalyptus pellita wood was radiation heated under different temperatures in vacuum condition. Effect of different temperatures and testing positions, contains different wood board depths, lengths, and widths, to heat absorption per unit mass (Qm) and average temperature increasing rate (VTmean) were studied. Influence degree to Qm and VTmean of the parameters were judged by analysis of covariance, and the degree of influence were weighed by LSD multiple comparisons. The results showed that:main factors which effecting VTmean and Qm during vacuum heat treatment were heat treatment temperature and testing board thickness, influence of distance from test point to board top and side was quite limited; VTmean and Qm went up as heat treatment temperature increasing and thickness enhancing, effect of depth increased significantly different at 0.05 levels when the depth difference reached up to 20 mm. The phenomenon of uneven heat transfer should to be taken into account when the thickness of the treating board was more than 40 mm.