Extremely fast freezing, low-temperature blast freezer
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United States of America Patent
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Jan 29, 2019
Grant Date -
Aug 17, 2017
app pub date -
Oct 17, 2016
filing date -
May 12, 2009
priority date (Note) -
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Abstract
A freezer includes a plurality of shelves in an insulated payload bay; a plurality of evaporators coupled to the payload bay with a multiplicity of coolant tubes in each evaporator, wherein each tube enters and then exits the payload bay, further comprising one or more cryogenic valves coupled to the coolant tubes; a pump to force coolant flowing through the evaporators with a pressure of at least 90 psi to supply the coolant at each evaporator with at least 20 gallons per hour of coolant; and a plurality of fans to circulate cooled air in the payload bay.
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