Cool-down Experiment of the Direct Throttling JT Cryocooler Working at Liquid Hydrogen Temperature

SHEN Yunwei; LIU Dongli; LIU Lei; QIU Changxu; ZHUAN Rui; GAN Zhihua

doi:10.3969/j.issn.1006-7086.2022.03.004

VACUUM AND CRYOGENICS > 2022 > 28(3): 273-278. > DOI: 10.3969/j.issn.1006-7086.2022.03.004

SHEN Yunwei, LIU Dongli, LIU Lei, et al. Cool-down Experiment of the Direct Throttling JT Cryocooler Working at Liquid Hydrogen Temperature[J]. VACUUM AND CRYOGENICS, 2022, 28(3): 273-278. DOI: 10.3969/j.issn.1006-7086.2022.03.004

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Cool-down Experiment of the Direct Throttling JT Cryocooler Working at Liquid Hydrogen Temperature

1. Cryogenics Center, Zhejiang University City College, Hangzhou 310015, China;
2. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;
3. Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, China;
4. Shanghai Institute of Aerospace Systems Engineering, Shanghai 201109, China

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Received Date: January 25, 2022
Available Online: July 05, 2023

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Abstract

The cryocooler working at liquid hydrogen temperature with a large cooling capacity is one of key technolo-gies for hydrogen zero boil-off storage in space.The precooled direct throttling JT cryocooler has advantages of absence of moving parts at low temperature and simplicity.With the potential to provide a large cooling capacity,it can realize longdistance transmission of cooling capacity separately.Meanwhile,the bypass structure is no longer required during the cooldown process.Based on the scheme of direct throttling JT cryocooler,an open-cycle experimental prototype of the direct throttling JT cryocooler working at liquid hydrogen temperature was built which was precooled by the GM cryocooler.Cool-down process was introduced.The cooling capacity of 10.19 W was measured at 20.8 K.
- liquid hydrogen temperature,
- large cooling capacity,
- direct throttling,
- JT cryocooler

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