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Proceedings Paper

Development of Stirling-type pulse tube coolers driven by commercial linear compressors
Author(s): Guenter Thummes; Luwei Yang
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Paper Abstract

After an introductory section on pulse tube cryocoolers (PTC) this paper reports the state of development of some medium-size PTCs for potential future replacement of commercial Stirling cold fingers. The coolers were designed for operation with the AIM SL200 compressor (nominal input power: 100 W) and Leybold Polar SC7 compressor (nominal input power: 200 W), respectively. Adjustment of phase shift between pressure and mass flow oscillation is accomplished by means of inertance tubes in combination with a reservoir and a second-inlet flow impedance that are attached to the warm end of the pulse tube. Two coolers with U-shaped and one with linear arrangement of regenerator and pulse tube have been built and optimized. Up to now, the smaller U-shaped PTC driven by the AIM compressor at 100 W input power reached a no-load temperature of 45 K, and a cooling capacity of 2.85 W at 80 K is achieved, corresponding to a coefficient of performance of COP = 2.85 %. For the two larger PTCs driven by the Leybold compressor at 200 W of input, the obtained no-load temperature and cooling power at 80 K are 38 K and 6 W for the U-shaped cooler and 44 K and 8.1 W for the linear cooler, corresponding to COPs of 3 % and 4 % at 80 K, respectively. Measurements of the refrigeration temperature as function of the cold head orientation with respect to gravity revealed a small convection-induced temperature variation of several percent. The minimum temperature is achieved with the pulse tube cold end facing downwards.

Paper Details

Date Published: 23 January 2003
PDF: 14 pages
Proc. SPIE 4820, Infrared Technology and Applications XXVIII, (23 January 2003); doi: 10.1117/12.451050
Show Author Affiliations
Guenter Thummes, TransMIT Ctr. for Adaptive Cryotechnology and Sensors (Germany)
Univ. of Giessen (Germany)
Luwei Yang, Univ. of Giessen (Germany)

Published in SPIE Proceedings Vol. 4820:
Infrared Technology and Applications XXVIII
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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