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As evident from the Figure 38 MC core curve, the drying rate after the fifth day of the vacuum drying trial BBT1 was compromised due to a kiln fan/variable speed drive (VSD) failure, whereby practically no drying occurred until approximately day 20 when the VSD was repaired. Through observation of the slope of the MC core curve, we estimate that the drying time should have been in the order of 25 days. The indicative conventional drying time from the green condition is 58 days for this species (Pearn, 2007). The total drying times, including equalisation for the vacuum trials BBT1to BBT4 were 25.0, 21.6, 27.9 and 24.8 days, respectively. 80 70 60 50 40 30 20 10 0 -10 0 MC core 5 10 15 20 Time (days) MC gradient EMC 900 800 700 600 500 400 300 200 100 0 25 30-100 Temperature Pressure 90 80 70 60 50 40 30 20 10 0 900 800 700 600 500 400 300 200 100 0 -100 0 10 20 30 40 50 Time (days) MC core MC gradient EMC Temperature Pressure Figure 38. V acuum drying chart – BB T1 trial Figure 40. V acuum drying chart – BB T3 trial 80 70 60 50 40 30 20 10 0 900 800 700 600 500 400 300 200 100 0 -100 0 5 10 15 20 25 30 Time (days) MC core MC gradient EMC Temperature Pressure 80 900 70 60 50 800 700 600 500 40 400 30 20 10 300 200 100 0 0 -100 0 5 10 15 20 25 30 Time (days) MC core MC gradient EMC Temperature Pressure Figure 39. V acuum drying chart – BB T2 trial Figure 41. V acuum drying chart – BB T4 trial Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report 76 MC (%), Temperature (°C) MC (%), Temperature (°C) Pressure (mbar) Pressure (mbar) MC (%), Temperature (°C) MC (%), Temperature (°C) Pressure (mbar) Pressure (mbar)PDF Image | Evaluation of super-heated steam vacuum drying
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