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Development of a Stirling-type pulse-tube cryocooler - improving the efficiency of expander and experimental examination of an inclination characteristic.

[In Japanese. / En japonais.]

Author(s) : HIRATSUKA Y., NOMURA T.

Type of article: Article

Summary

The pulse-tube cryocooler does not need moving parts in the expansion space and it has advantages such as low vibration and high reliability. On the other hand, in order to enable the pulse-tube cryocooler to perform compression and expansion with a gas piston unlike other cryocoolers which have a solid piston, the trend is to influence the cryocooler performance by varying operating conditions. When the low temperature part of the expander is in the top with respect to the ambient temperature part, natural convection occurs by the influence of the gravity and a cooling capacity decreases greatly. The authors have developed the Stirling-type pulse-tube cryocooler 'WE-SP2000' with cooling capacity 4.6 W at 77 K for 200 W input power for high-temperature superconductor devices and semiconductor sensors, but there have been demands a smaller size, a high efficiency and higher reliability and needed further improvement. The paper describes an examination that was done of the efficiency improvement due to the change in the pulse-tube size and 24% of a cooling capacity has improved as a result. Furthermore, the influence of the inclination exerted on the cooling capacity for differences in expander form was examined.

Details

  • Original title: [In Japanese. / En japonais.]
  • Record ID : 2005-2566
  • Languages: Japanese
  • Source: Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers - vol. 21 - n. 4
  • Publication date: 2004

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