TDAL has it's merits, however, I'm not sure if it is interperated correctly and then implemented right. What GeorgeCulp says is very true. I've been preaching a "management of constants" approach here in South Africa(it should actually just be - getting the basics right!!), but the value of having someone with enough training and the passion to make the whole drying operation their own to manage it properly has fallen largely on deaf ears. In short, the constants are (but not limited to):
1.Preparation – Sawing accuracy, board dimension, stacking procedures ect
2.Process Control – Airflow, energy distribution and management, humidity control and venting
3.Maintenance – Electrical, Mechanical, Instrumentation and structure
You may have the best drying schedule that works 100% for a specific specie and dimension, but the moment any one of the above "constants" changes, it influances the drying curve and you could be loosing time and/or quality.....in short, the drying schedule is not the optimum for the conditions inside the kiln anymore
Only when you have mastered this, can you really start fine tuning drying schedules.