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| High-and-Low Temperature Testing System with Characteristics of Large Load and High Temperature Change Rate |
| Received:April 02, 2018 Revised:July 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.07.005 |
| KeyWord:high-and-low temperature testing system large load high temperature change rate large space ejector atomization integral separation control strategy |
| Author | Institution |
| MA Ping-chang |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| GAO Fei |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| LIU Jie |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| LIU Yue |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| LI Hong |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
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| Abstract: |
| Objective To develop a high-and-low temperature testing system with characteristics of large load and high temperature change rate, and introduce its key technologies and design thoughts. Its payload was up to 1.0 t (aluminum) and the temperature change rate was up to 5 /min to meet the requirement on actual measurement. ℃ Methods In order to satisfy requirements of the large load and high temperature change rate, the heating and refrigeration methods and power were designed. Because of characteristics of large space and large load in test zone, the space temperature gradient would be large and temperature would fluctuate dramatically. In view of these difficulties, coordinated design of each system was done. Especially, the design of ejector atomization in low temperature system and temperature integral separation control strategy were put forward. Results The temperature in test zone achieved a better follow in the temperature change stage and it has good spatial uniformity and volatility in the stable stage. Temperature uniformity in space was less than or equal to 2 , and volatility was less than or ℃ equal to 0.5 . ℃ Conclusion By using the closed single loop mode, and through design of ejection atomization and the control strategy of temperature integral separation, the space uniformity and fluctuation of the high-and-low temperature testing system and the requirement of temperature variation can be realized. |
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