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Cryorefroidisseur à tube à pulsation de type Stirling de puissance élevée fonctionnant aux alentours de 80 K.

High-power Stirling-type pulse tube cryocooler for operation near 80 K.

Numéro : pap. n. 068

Auteurs : SUN J., DIETRICH M., THUMMES G.

Résumé

High-power cryocoolers are used in many superconductor and gas liquefying applications. Stirling-type pulse-tube cryocoolers (PTCs) offer the advantage of high reliability, high efficiency and low maintenance compared to other cooler types. An in-house made single-stage Stirling-type pulse-tube cryocooler with inline configuration of regenerator and pulse tube was optimized for high cooling power near 80 K. The cooler is driven by a 10 kW-class linear compressor with dual opposed pistons (QDrive model 42SM-2S297W PWG). In order to reduce losses from pressure drop, the regenerator is designed with a small length to diameter ratio, thus making it susceptible to internal streaming losses. These losses manifest themselves in a measureable temperature inhomogeneity around the circumference of the regenerator and in a low cooling performance. To overcome these losses, the transverse heat conductance in the regenerator was increased by use of sandwich type fillings, where a part of the original stainless wire mesh was replaced by materials with higher thermal conductance, such as copper and brass mesh. Several types of sandwich fillings were experimentally investigated. Using these types of regenerator fillings, the losses from streaming were significantly reduced and the minimum no-load temperature was lowered from 54 to 47.5 K. The mean pressure and frequency of the pressure oscillation were also optimized. Up to now, a cooling power of 413 W at 80 K is available with an acoustic power (pV-power) of 7.8 kW at a frequency of 56 Hz.

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Format PDF

Pages : 384-389

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    20 €

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Détails

  • Titre original : High-power Stirling-type pulse tube cryocooler for operation near 80 K.
  • Identifiant de la fiche : 30006967
  • Langues : Anglais
  • Source : Cryogenics 2012. Proceedings of the 12th IIR International Conference: Dresden, Germany, September 11-14, 2012.
  • Date d'édition : 11/09/2012

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