Study on the Influence of Filling Ratio on the Startup and Heat Transfer Performance of the Separate Heat Pipe with Plate Evaporator

Chang Zhuang; Bai Bofeng; Han Xu; Wen Boyao; Luo Zhengyuan; Zhang Siliang

doi:10.13832/j.jnpe.2024.090044

Volume 46 Issue 5

Oct. 2025

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Article Navigation > Nuclear Power Engineering > 2025 > 46(5): 46-55

Chang Zhuang, Bai Bofeng, Han Xu, Wen Boyao, Luo Zhengyuan, Zhang Siliang. Study on the Influence of Filling Ratio on the Startup and Heat Transfer Performance of the Separate Heat Pipe with Plate Evaporator[J]. Nuclear Power Engineering, 2025, 46(5): 46-55. doi: 10.13832/j.jnpe.2024.090044

Citation:

Chang Zhuang, Bai Bofeng, Han Xu, Wen Boyao, Luo Zhengyuan, Zhang Siliang. Study on the Influence of Filling Ratio on the Startup and Heat Transfer Performance of the Separate Heat Pipe with Plate Evaporator[J]. Nuclear Power Engineering, 2025, 46(5): 46-55. doi: 10.13832/j.jnpe.2024.090044

Citation:

Chang Zhuang, Bai Bofeng, Han Xu, Wen Boyao, Luo Zhengyuan, Zhang Siliang. Study on the Influence of Filling Ratio on the Startup and Heat Transfer Performance of the Separate Heat Pipe with Plate Evaporator[J]. Nuclear Power Engineering, 2025, 46(5): 46-55. doi: 10.13832/j.jnpe.2024.090044

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Study on the Influence of Filling Ratio on the Startup and Heat Transfer Performance of the Separate Heat Pipe with Plate Evaporator

doi: 10.13832/j.jnpe.2024.090044

1.
State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, 710049, China
2.
China Nuclear Power Engineering Co., Ltd., Beijing, 100086, China
3.
Lanpec Technologies Limited (Shanghai), Shanghai, 201518, China

Received Date: 2024-09-14
Rev Recd Date: 2024-11-28

Available Online: 2025-10-15

Publish Date: 2025-10-15

Abstract

Abstract

Separated heat pipe can remove the decay heat generated by spent fuel effectively, demonstrating significant application value in the field of passive residual heat removal in nuclear plants. A new type of Separated heat pipe, featuring a capsule-type plate for the evaporator and a serpentine finned aluminum flat tube for the condenser, was proposed by our research group, and the influence law of different filling ratios on the start-up and heat transfer performance of Separated heat pipe was experimentally analyzed. The research found that, for the separated heat pipe with plate type evaporator in this research, the differential pressure across the evaporator reflects the start-up characteristics of Separated heat pipe more accurately compared to the superheat degree at the evaporator outlet. The time required for the evaporator pressure difference to stabilize first increases and then decreases with increasing filling ratio, indicating that the filling ratio significantly affects the startup behavior of such heat pipes. The maximum heat transfer capacity of Separated heat pipe can reach 183.6 kW in stable operation, and the corresponding filling ratio is 51%. The two-phase heat exchange area in evaporator and the temperature difference between working medium and environment in condenser both reaches maximum values at this point. Furthermore, the curve of heat transfer capacity versus filling ratio shows an optimal range of 51% to 82%, within which Separated heat pipe maintains high heat transfer performance. The thermal resistance of condenser dominates the total thermal resistance of Separated heat pipe. These research results provide references for optimization design and engineering application of Separated heat pipe.
- Separated heat pipe,
- Plate heat exchanger,
- Filling ratio,
- Start-up,
- Heat transfer performance

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References(24)

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