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Système frigorifique à grande échelle pour les essais sur le terrain du télescope de James Webb au NASA Johnson Space Center (Centre spatial Johnson de la NASA).

Large scale refrigeration plant for ground testing the James Webb telescope at NASA Johnson Space Center.

Auteurs : ARNOLD P., DECKER L., HOWE D., et al.

Résumé

The James Webb Telescope is the successor to the Hubble Telescope and will be placed in an orbit of 1.5 million km from earth. Before launch in 2014, the telescope will be tested in NASA Johnson Space Center's space simulation chamber, Chamber A. The tests will be conducted at the deep space conditions of low pressure and temperature. Chamber A's helium cryopanels are currently cooled down to 20 K by two Linde 3.5 kW refrigerators. The new 12.5 kW, 20 K Coldbox described in this paper is part of the upgrade to the chamber systems for this large test program. The Linde Coldbox will provide refrigeration power in several operating modes where temperatures and refrigeration power are controlled with high accuracy due to the demanding NASA test requirements. The implementation of two parallel expansion turbine strings and the Ganni floating pressure cycle results in a highly efficient and flexible process that reduces the electrical power input. This paper describes the collaboration and execution of the Coldbox project.

Détails

  • Titre original : Large scale refrigeration plant for ground testing the James Webb telescope at NASA Johnson Space Center.
  • Identifiant de la fiche : 2010-0376
  • Langues : Anglais
  • Source : Deutsche Kälte-Klima-Tagung: 2009, Berlin.
  • Date d'édition : 18/11/2009

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