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Optimisation de la géométrie de l'échangeur de chaleur à contre-courant grâce à la minimisation de la production d'entropie.

Optimization of counterflow heat exchanger geometry through minimization of entropy generation.

Auteurs : LEROU P. P. P. M., VEENSTRA T. T., BERGER J. F., et al.

Type d'article : Article

Résumé

A counterflow heat exchanger (CFHX) is an essential element for recuperative cooling cycles. The performance of the CFHX strongly influences the overall performance of the cryocooler. In the design of a heat exchanger, different loss mechanisms like pressure drop and parasitic heat flows are often treated separately. Acceptable values for the pressure drop and total heat leakage are estimated and thus a CFHX geometry is more or less arbitrarily chosen. This article applies another, less familiar design strategy where these losses are all treated as a production of entropy. It is thus possible to compare and sum them. In this way, a CFHX configuration can be found that is optimal for a certain application, producing a minimum of entropy and thus has minimum losses. As an example, the design steps of a CFHX for the microcooling project at the University of Twente are given. Also a generalization of micro CFHX dimensions for cooling powers between 10 and 120 mW is presented. [Reprinted with permission from Elsevier. Copyright, 2005].

Détails

  • Titre original : Optimization of counterflow heat exchanger geometry through minimization of entropy generation.
  • Identifiant de la fiche : 2006-2746
  • Langues : Anglais
  • Source : Cryogenics - vol. 45 - n. 10-11
  • Date d'édition : 10/2005

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