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Chinese Journal of Space Science ›› 2019, Vol. 39 ›› Issue (2): 233-241.doi: 10.11728/cjss2019.02.233

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Precision Thermal Control Scheme of Fluctuating Temperature for Space Fluid Loop

ZHANG Hanze1,3, ZHENG Tong1,3, ZHANG Hanxun1,3, CHEN Bo2,3   

  1. 1. Technology and Engineering Center for Space Utilization, Chinese Academy of Sciences, Beijing 100094;
    2. National Space Science Center, Chinese Academy of Sciences, Beijing 100190;
    3. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2018-04-02 Revised:2018-06-28 Online:2019-03-15 Published:2019-03-27

Abstract:

Fluid temperature at the inlet branches of the space fluid loop fluctuates randomly within a specific range, therefore measures should be taken to decrease their thermal effects on cold-plate cooled high-stability requirement payloads. Because the traditional patch heaters require additional power and produce waste heat, a scheme of fluid mixing with PID controlled valves is proposed, which can utilize thermal energies in different loop braches to control the temperature at the coldplate inlet by regulating valve openings. A numerical study is performed and its results show the system can satisfy the high precision temperature control requirement. The fuzzy PID control effect is better than that of the PID control algorithm, such as faster response, less overshoot, and higher control precision. Therefore, the fuzzy PID is preferred as the control algorithm of this scheme.

Key words: Precision thermal control, Fluid loop, Control strategy

CLC Number: