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6 Recommendations The results of drying trials show that vacuum drying produces material of the same or better quality than is currently being produced by conventional methods in a much faster timeframe. Economic analysis indicates positive or negative results depending on the species and the size of drying operation. We recommend vacuum drying over conventional drying for all operation sizes, in terms of drying quality, time and economic viability, for E. marginata and E. pilularis. We also recommend vacuum drying over conventional drying for the same reasons for drying C. citriodora and E. obliqua in larger drying operations (kiln capacity 50 m3 or above), but not for smaller operations at this stage. Further schedule refinement has the ability to reduce drying times further and may improve the vacuum drying viability of the latter species in smaller operations. Anecdotal evidence suggests that vacuum drying viability is strengthened when drying thicker dimension timber as the difference in vacuum and conventional drying times is magnified. We recommend this topic for further investigation. A comprehensive heat and mass transfer drying model has been developed with the ability to accurately simulate vacuum and conventional drying of Australian hardwood species. This has the ability to significantly reduce the time required for this type of research. We recommend developing the model to include a mechanical component with the ability to simulate drying shrinkage stress/strain to predict drying degrade such as checking, distortion and residual drying stress. 118 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final reportPDF Image | Evaluation of super-heated steam vacuum drying
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