Patent: Convection current freeze drying apparatus and method of operating the same

A convection current vacuum freeze drying apparatus is disclosed which includes a dryer chamber unit comprising a plurality of trays for depositing products to be freeze dried; a convection current condenser unit, mechanically connected to the dryer chamber unit, comprising a plurality of first elongate heat exchange tubes each having fins arranged around an outer circumference of the first elongate heat exchange tube; a refrigerator unit mechanically connected to the convection current condenser unit, operable to provide cold temperature to the plurality of elongate heat exchange tubes; a cooling tower unit mechanically connected to the convection current condenser unit; a primary vacuum pump unit, mechanically connected to the convection current condenser unit and the cooling tower unit, operable to provide a vacuum pressure to said convection current condenser unit; and a heater unit mechanically connected to provide a heat energy to both the dryer chamber unit and the convection current condenser unit.

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US10451346 B1