Cryogenic freezer control

Details Cryogenic freezer control Cryogenic freezer control

1990-07-13

1991-10-08

Capossela, Ronald C.

Refrigeration

Processes

Treating an article

62216, 62374, 62380, F25D 1306

Patent

active

050542923

ABSTRACT:
Method and apparatus for controlling the cooldown and steady-state operation of a tunnel type cryogenic freezer by providing auxiliary cryogen to one or more gas recirculating zones of the freezer and controlling the supply of the auxiliary cryogen by sensing the temperature of the gas recirculating zone and comparing the temperature to a pre-set level.

REFERENCES:
patent: 3403527 (1968-10-01), Berreth et al.
patent: 3427820 (1969-02-01), Hart
patent: 3613386 (1971-10-01), Klee
patent: 3813895 (1974-06-01), Klee et al.
patent: 3892104 (1975-07-01), Klee et al.
patent: 4229947 (1980-10-01), Klee
patent: 4237695 (1980-12-01), Oberpriller et al.
patent: 4475351 (1984-10-01), Klee
patent: 4589264 (1986-05-01), Astrom
patent: 4800728 (1989-01-01), Klee

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