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Table 72. Simulation and experimental time comparisons versus MC C. citriodora MC (%) Model Experiment 50 ------- ------- 30 15 14 20 75 78 15 132 139 11 197 216 Drying time (hrs) E. marginata E. pilularis Model Experiment Model Experiment 104 87 32 39 230 247 264 239 326 405 459 419 410 461 558 536 548 535 610 588 E. obliqua Model Experiment 297 203 570 538 717 726 787 790 815 831 Conventional drying simulation results Using adjusted (measured) diffusion coefficient values, a simulation of conventionally drying C. citriodora was undertaken. The kiln drying schedule (dry and wet-bulb temperatures) was provided by Dale and Meyers sawmill, Queensland and is not published in this report due to commercial confidentiality. The air velocity was held at 2 m/s, common for this species, and the pressure held at ambient; 1000 mbar. All other simulation parameters were the same as those used to simulate vacuum drying for this species. The target final MC for this species is 11%, achieved after 504 hrs (21 days). We did not investigate conventional schedule simulations for the other species due to time constraints. Figure 81 depicts the simulation results for MC. After 504 hours the final simulated MC was 11.1%, very close to the target. This signifies that the model, although developed for vacuum drying, can be readily used for conventional drying, the predominant drying method currently used by industry. 0.5 0.4 0.3 0.2 0.1 0 0 200 Figure 81. Transpore 2-D conventional drying moisture content simulation results for C. citriodora using measured diffusion coefficient and pre-drying phase Model - surface Model - core Time (hrs) 400 600 114 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report Moisture content (%/%)PDF Image | Evaluation of super-heated steam vacuum drying
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