21-25 July 2019
Connecticut Convention Center, Level 6
US/Eastern timezone

C2Or2A-05: Investigation of improving cool-down speed of Stirling type pulse tube cryocooler with ambient displacer

23 Jul 2019, 16:30
15m
Level 6, Room 26-27

Level 6, Room 26-27

Speakers

Cungang Yan (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences) Prof. Xiaotao Wang (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences) Prof. Wei Dai (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

Description

For a good cryocooler, besides high efficiency at working temperature, the cool-down speed is also important for some applications. Because of the difference in structure and operation mechanism, different cryocoolers have different characteristics of cool-down speed. This work introduces a Stirling type pulse tube cryocooler with ambient displacer which works at liquid nitrogen temperature region, and a strategy for improving the cool-down speed from room temperature to liquid nitrogen temperature has been investigated through simulation. The pulse tube cryocooler can provide 17.8 W cooling power at 77 K with 180 W input acoustic power at 70 Hz. By fixing the maximum displacer movement in the simulation, we investigate how tuning frequency around 70 Hz can change the cool-down speed. The strategy turns out be effective in the beginning stage of the cool-down process, an improvement of speed by about 15-20%. The gain becomes less obvious as the cold head temperature drops. In conclusion, tuning frequency during cool-down process helps the cold-head to reach final temperature faster but the average gain is not as big as expected.

Primary authors

Cungang Yan (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences;University of Chinese Academy of Sciences) Prof. Xiaotao Wang (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences) Prof. Wei Dai (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences) Prof. Ercang Luo (Technical Institute of Physics and Chemistry, Chinese Academy of Sciences)

Presentation Materials

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