Refrigeration – Storage of solidified or liquified gas – Liquified gas transferred as liquid
Patent
1989-10-02
1992-12-29
Capossela, Ronald C.
Refrigeration
Storage of solidified or liquified gas
Liquified gas transferred as liquid
62 511, 624579, F17C 902
Patent
active
051741229
ABSTRACT:
A payload loaded into a chamber is cycled to a low temperature of about -320.degree. F. using liquid nitrogen fed to a heat exchanger evaporator that is located at the top of the chamber so that gaseous nitrogen vapor from the evaporator, at substantially the same temperature as the liquid nitrogen, is circulated to a payload in the chamber below, and, at the same time, gas from the chamber is circulated upward to highly thermally conductive fins on the heat exchanger that are cooled by the liquid nitrogen evaporation. Thus, heat from the payload is fed from the gas circulating upward to the heat exchanger to evaporate the liquid nitrogen and so the payload located at the bottom of the chamber is cooled by gas kinetics and is never touched by the liquid nitrogen.
In a preferred embodiment, an electric heater element and a fan are provided between the heat exchanger and the chamber and the heater is controlled to modify temperature descent rate during a low temperature cycle and to heat the chamber up to about +300.degree. F. for a high temperature cycle; and the heat exchanger, heater and fan are all carried by a (power) head that fits over and partially into the top of the chamber. Thus, the chamber may be a vacuum (envelope) chamber with no penetrations of the vacuum envelope to accommodate any of the elements, detectors or actuators and no cryogenic liquid inlet tubes penetrate the chamber.
REFERENCES:
patent: 3354668 (1967-11-01), Cserny
patent: 3411318 (1968-11-01), Puckett
patent: 3512370 (1970-05-01), Murphy et al.
patent: 4006606 (1977-02-01), Underdue
patent: 4377076 (1983-03-01), Staudt et al.
patent: 4485641 (1984-12-01), Angelier et al.
patent: 4739622 (1988-04-01), Smith
patent: 4783969 (1988-11-01), Hohol
Applied Cryogenics, Inc.
Capossela Ronald C.
Dunn Robert T.
LandOfFree
Method and means of low temperature treatment of items and mater does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and means of low temperature treatment of items and mater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and means of low temperature treatment of items and mater will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1879874