Investigation on phase shifting for a 4 K Stirling pulse tube cryocooler with He-3 as working fluid |
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| Affiliation: | 1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. Institute of Applied Physics, University of Giessen, D-35392 Giessen, Germany;3. TransMIT-Centre for Adaptive Cryotechnology and Sensors, D-35392 Giessen, Germany;1. School of Energy and Power Engineering, Wuhan University of Technology, Wuhan 430063, China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, 710049, China;1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China;1. State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, PR China;2. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;1. Research and Development Directorate, Japan Aerospace Exploration Agency, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan;2. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;3. Sumitomo Heavy Industries, Ltd., Industrial Equipment Division, 5-2 Soubiraki-cho, Niihama, Ehime 792-8588, Japan;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. Key Lab. of Ref. & Cryo. Technology of Zhejiang Province, Hangzhou 310027, China;3. TransMIT - Centre of Adaptive Cryotechnology and Sensors, D-35392 Giessen, Germany;4. Institute of Applied Physics, University of Giessen, D-35392 Giessen, Germany |
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| Abstract: | He-3 is generally recognized for its ability to provide more excellent thermophysical performance than He-4, especially in the 4 K temperature range. However, this was not always the case in our preliminary experiments on a three-stage Stirling-type pulse tube cryocooler (SPTC). Our ongoing studies, as reported in this paper, demonstrate that the different working fluids also affect the performance through their phase shifting capability. This feature has been passed over in large part by researchers considering refrigerant substitution. Unlike previous theoretical analyses that focus primarily on regenerator losses, this report investigates the effects of the working fluid on the phase angle at the cold end in order to quantitatively reveal the relationship between the lowest attainable temperature and the cooling capacity. The analysis agrees well with our experimental results on a three-stage SPTC. While running with the operating parameters optimized for He-3, the lowest temperature of the SPTC decreased from 5.4 K down to 4.03 K. This is the lowest refrigeration temperature ever achieved with a three-stage SPTC. |
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| Keywords: | Stirling-type pulse tube cryocooler Liquid helium temperature He-3 Phase shifting |
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