Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1973-12-10
1976-02-17
O'Dea, William F.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62203, 62208, 62380, F25D 2106
Patent
active
039383504
ABSTRACT:
Freezing apparatus in which food is quickly frozen comprising five coils, two joined in series to form a first set and two joined in series to form a second set, the exhaust of the two sets being delivered to the fifth coil in a pre-cooling chamber where food is introduced by a conveyor to the freeze tunnel. Each of the five coils is positioned in a separate chamber in the tunnel and thermal couple sensors deliver signals which are compared to a set-point signal in proportional controllers to control the flow of liquid nitrogen to each set of coils. Flow from the first and second sets of coils is vented to atmosphere and heater apparatus adjacent the fifth coil is energized when the temperature of nitrogen vapor discharged from the fifth coil is less than a predetermined value which results when formation of ice on the surface of the fifth coil reduces exchange of the heat between air circulated over the fifth coil and nitrogen vapor flowing therethrough.
REFERENCES:
patent: 3263441 (1966-08-01), Rother
patent: 3374640 (1968-03-01), Boese
patent: 3757531 (1973-09-01), Gement, Jr.
Martin Patrick S.
Moody Barron M.
Capossela Ronald C.
Crutsinger Gerald G.
Cryogenics Corporation of America
Moore Howard E.
O'Dea William F.
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