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Orientation dependence of cooling performance in tilted 4 K pulse tube coolers.

Number: 0007

Author(s) : SCHMIDT J. A., SCHMIDT B., FALTER J., THUMMES G., SCHIRMEISEN A.

Summary

We report an experimental study of the effect of tilting from vertical orientation on the cooling performance of a U-shaped 4 K pulse tube cryocooler (PTC) with 7 kW electrical input power. An investigation of cooling performance over tilt angles from 0 to ±60°for selected azimuthal orientations of the PTC is performed. The non-coaxial arrangement of the tubes suggests an asymmetric cooling performance while tilting along the first or second stage heat exchanger due to natural convection in the pulse tubes. The increase of no-load temperatures upon tilting by +/- 50° is asymmetric with a temperature difference of <2 K for the first and <0.05 K for the second stage of the cryocooler. While the regime of tilt angles within 30° show moderate loss in cooling power an almost sudden decrease of cooling power is revealed and analyzed for high tilt angles. The minimal no-load temperature of 2.19 K in vertical position is increased to 3.2 K and the vertical cooling power of 1.1 W at 4.2 K is reduced to 0.79 W at 60° inclination.

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Pages: 7

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Details

  • Original title: Orientation dependence of cooling performance in tilted 4 K pulse tube coolers.
  • Record ID : 30029003
  • Languages: English
  • Source: Cryogenics 2021 online. Proceedings of the 16th IIR International Conference, October 5-7, 2021.
  • Publication date: 2021/10/05
  • DOI: http://dx.doi.org/10.18462/iir.cryo.2021.0007
  • Document available for consultation in the library of the IIR headquarters only.

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