Is it normal that huge temperature difference between shelves and raw material?

Is it normal that huge temperature difference between shelves and raw material?

Yes, its normal.

 

The shelves temperature displayed is the inlet temperature of the heat transfer fluid (it may change as per the recipe programmed). The material trays temperature displayed are the raw products real-time temperatures.

 

The fluid provide energy to raw product, enable frozen water inside sublimate to vapor. That means their temperature difference will be smaller and smaller, when freeze drying finish, the temperature of them will be same!

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