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Analyse numérique couplée de la température des écrans, des pertes thermiques et des pressions du gaz résiduel dans un superisolant sous vide, combinant réseaux thermiques et réseaux de fluides. 1. Régime stationnaire.

A coupled numerical analysis of shield temperatures, heat losses and residual gas pressures in an evacuated super-insulation using thermal and fluid networks. 1. Stationary conditions.

Auteurs : REISS H.

Type d'article : Article

Résumé

The paper describes numerical simulations, using thermal networks, of shield temperatures and radiative and conductive heat losses of a super-insulated cryogenic storage tank operating at 77 K. Interactions between radiation and conductive heat transfer modes in the shields are investigated, by calculation of local shield temperatures. As a new method, fluid networks are introduced for calculation of stationary residual gas pressure distribution in the evacuated multilayer super-insulation. Output from the fluid network is coupled to the iterative thermal network calculations. Parameter tests concern thickness and emissivity of shields, degree of perforation, residual gas sources like desorption from radiation shields, spacers and container walls, and permeation from the inner container to the evacuated insulation space.

Détails

  • Titre original : A coupled numerical analysis of shield temperatures, heat losses and residual gas pressures in an evacuated super-insulation using thermal and fluid networks. 1. Stationary conditions.
  • Identifiant de la fiche : 2005-1097
  • Langues : Anglais
  • Source : Cryogenics - vol. 44 - n. 4
  • Date d'édition : 04/2004

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