Global Patent Index - EP 1030135 A1

EP 1030135 A1 2000-08-23 - Process and apparatus for controled cooling by evaporating liquid nitrogen

Title (en)

Process and apparatus for controled cooling by evaporating liquid nitrogen

Title (de)

Verfahren und Einrichtung zur geregelten Kühlung durch Verdampfen flüssigen Stickstoffs

Title (fr)

Procédé et dispositif pour le refroidissement controlée utilisant l'evaporation d'azote liquide

Publication

EP 1030135 A1 (DE)

Application

EP 99125892 A

Priority

  • EP 99125892 A
  • EP 99103355 A

Abstract (en)

The method involves using an intermediate medium that is cooled by the evaporated liquid nitrogen in a condenser (7) and has a different boiling characteristic from nitrogen. The intermediate medium passes from the condenser to an evaporator (6) as a liquid. The evaporated medium is fed back to the condenser for re-cooling and condensing. The solidifying point of the intermediate medium is higher than the evaporation temp. of the liquid nitrogen and the evaporation of the liquid nitrogen takes place at atmospheric pressure in thermal contact with the intermediate medium. An Independent claim is also included for an arrangement for regulated cooling with evaporated liquid nitrogen.

Abstract (de)

Bei einem Verfahren zur geregelten Kühlung durch Verdampfen flüssigen Stickstoffs wird ein Wärmeträger über ein Zwischenmedium gekühlt, welches mit dem verdampfenden flüssigen Stickstoff in einem Kondensator (7) gekühlt und von diesem in flüssiger Phase in einen Verdampfer (6) geleitet wird. In dem Verdampfer wird das flüssige Zwischenmedium unter geregeltem Druck und unter Wärmeaufnahme von dem Wärmeträger verdampft, zum Kondensator zurückgeführt und kondensiert. Damit in dem Kreislauf des Zwischenmediums niedriger Dampfdruck auftritt, wird ein Zwischenmedium verwendet, dessen Erstarrungspunkt bei einer höheren Temperatur liegt als die Verdampfungstemperatur des flüssigen Stickstoffs. Der flüssige Stickstoff wird bei Atmosphärendruck in Wärmeaustausch mit dem Zwischenmedium verdampft. <IMAGE>

IPC 1-7 (main, further and additional classification)

F25D 3/10; F25B 25/00; F25D 17/02

IPC 8 full level (invention and additional information)

F25B 25/00 (2006.01); F25D 3/10 (2006.01); F25D 17/02 (2006.01)

CPC (invention and additional information)

F25D 17/02 (2013.01); F25B 25/00 (2013.01); F25D 3/10 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 1030135 A1 20000823; EP 1030135 B1 20020911

INPADOC legal status


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