Hot air transfers heat and carries away moisture
Belt and tray systems move air around prepared food. Set temperature, airflow, bed depth and residence time from a trial.
PROCESS ROUTES
Hot Air Drying vs. Freeze-Drying
Understand the difference between thermal evaporation and vacuum sublimation.
ENGINEERING GUIDE
What to check
Freeze-drying begins with frozen material
Ice sublimates under vacuum. Size around wet load per batch, the complete cycle and ice captured by the condenser.
Decide from the finished product
Compare texture, rehydration, color and storage needs alongside energy and scheduling. Air knives after washing remove only free surface water.
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