Abstract
Systematic investigations towards performance improvement of a two-stage 4 K pulse tube cooler, concerning structural parameters, staging configuration and compressor input power, are presented in this paper. Theoretical analysis and experiment reveal that a proper negative DC flow through the double-inlet bypass has positive effects on cooling performance. With a modified cooler design a highest cooling power of 0.5 W at 4.2 K and 1 W at 5 K have been achieved. With heating load of 20 W at 67 K on the first stage, the 2nd stage can provide 0.42 W at 4.2 K. All these results have been obtained by using a 6 kW G-M compressor combined with a redesigned GM rotary valve. By using a compressor with measured input power of 1.7 kW the same cooler has a net cooling power of 170 mW at 4.2 K. The corresponding COP at 4.2 K is 1.0×10-4, which reaches the same order of magnitude as that of GM or GM+JT coolers at the same temperature range.
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© 1998 Springer Science+Business Media New York
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Wang, C., Thummes, G., Heiden, C. (1998). Performance Study on a Two-Stage 4 K Pulse Tube Cooler. In: Kittel, P. (eds) Advances in Cryogenic Engineering. Advances in Cryogenic Engineering, vol 43. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9047-4_259
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DOI: https://doi.org/10.1007/978-1-4757-9047-4_259
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