Abstract
A high-efficiency pulse tube cryocooler at 20 K is a prerequisite for closed JT coolers to obtain 100 mW@4.2 K in space. Therefore, it is of strategic importance to develop a two-stage pulse tube cryocooler with high efficiency at 20 K for space applications. Based on this, the low temperature stage compressor, the low temperature stage regenerator structure, the cryogenic inertance tube size and the cryogenic gas reservoir volume were optimized in this paper to improve the performance. Finally, an efficient and compact space pulse tube cryocooler at 20 K was obtained. The cryocooler can obtain a cooling capacity of 670 mW@20 K with a relative Carnot efficiency of 2.54% when the total input power is 370 W, the second stage operating frequency is 27 Hz and the second stage charging pressure is 1.5 MPa.
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Acknowledgements
This work was supported by National Key R&D Plan under grant NO. 2018YFB0504603 and the National Basic Research Program of China (Grant No.613322).
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Zhu, Q.L. et al. (2023). Optimization of Two-Stage High-Efficiency Pulse Tube Cryocooler for Space Application at 20K. In: Qiu, L., Wang, K., Ma, Y. (eds) Proceedings of the 28th International Cryogenic Engineering Conference and International Cryogenic Materials Conference 2022. ICEC28-ICMC 2022. Advanced Topics in Science and Technology in China, vol 70. Springer, Singapore. https://doi.org/10.1007/978-981-99-6128-3_105
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DOI: https://doi.org/10.1007/978-981-99-6128-3_105
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