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Une analyse numérique du refroidissement pour l'assemblage des détecteurs Dewar refroidis grâce à des [cryorefroidisseurs] Joule-Thomson.

A numerical cool-down analysis for Dewar-detector assemblies cooled with Joule-Thomson cryocoolers.

Auteurs : TZABAR N., KAPLANSKY A.

Type d'article : Article, Article de la RIF

Résumé

Joule–Thomson (J–T) cryocoolers are commonly in use for rapid cool-down of Infra-Red (IR) detectors. The cool-down time is governed both by the J–T cryocooler performances and the Dewar structure, which is usually geometrically complicated. A finite-element model of the complete Dewar-Detector-Cooler Assembly (DDCA) is developed. The analysis calculates the heat transfer in the Dewar and the J–T cryocooler, the coolant flow rate, the pressure drop in the vessel that supplies the coolant to the J–T cryocooler, and the pressure drop in the low pressure stream of the heat exchanger that determines the pressure in the evaporator. A verification of the analysis is conducted against experimental results with a single cryocooler at a single scenario and the model is further validated against eleven other experimental results. A satisfactory agreement is obtained between the analysis and the experimental results.

Documents disponibles

Format PDF

Pages : 56-65

Disponible

  • Prix public

    20 €

  • Prix membre*

    Gratuit

* meilleur tarif applicable selon le type d'adhésion (voir le détail des avantages des adhésions individuelles et collectives)

Détails

  • Titre original : A numerical cool-down analysis for Dewar-detector assemblies cooled with Joule-Thomson cryocoolers.
  • Identifiant de la fiche : 30011709
  • Langues : Anglais
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 44
  • Date d'édition : 08/2014

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