Thermal Switch Characteristics of a Multi-channel Parallel Pulsating Heat Pipe

Bi Tianshuo; Lü Yan; Shao Xuan; Xu Rongji

doi:10.12465/j.issn.0253-4339.2025.03.138

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Thermal Switch Characteristics of a Multi-channel Parallel Pulsating Heat Pipe

更新时间：2025-05-30

- Thermal Switch Characteristics of a Multi-channel Parallel Pulsating Heat Pipe
- Journal of Refrigeration Vol. 46, Issue 3, Pages: 138-144(2025)
- 作者机构：
  
  1.北京建筑大学环境与能源工程学院　北京市建筑能源高效综合利用工程技术研究中心　北京　 100044
  2.北京市市政工程设计研究总院有限公司　北京　 100082
- 作者简介：
  
  Xu Rongji, male, professor, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, 86-15313394763, E-mail: xurongji@bucea.edu.cn. Research fields: heat and mass transfer and solar thermal utilization.
- 基金信息：
  
  National Natural Science Foundation of China(51506004)
- DOI：10.12465/j.issn.0253-4339.2025.03.138
  CLC： TK172.4;TB61⁺1
- Received：30 April 2024，
  
  Revised：25 May 2024，
  
  Accepted：02 August 2024，
  
  Published：16 June 2025
- 稿件说明：
移动端阅览
Bi Tianshuo, Lü Yan, Shao Xuan, et al. Thermal Switch Characteristics of a Multi-channel Parallel Pulsating Heat Pipe[J]. Journal of refrigeration, 2025, 46(3): 138-144.
DOI：

Bi Tianshuo, Lü Yan, Shao Xuan, et al. Thermal Switch Characteristics of a Multi-channel Parallel Pulsating Heat Pipe[J]. Journal of refrigeration, 2025, 46(3): 138-144. DOI： 10.12465/j.issn.0253-4339.2025.03.138.

摘要

搭建了多通路并联式脉动热管热开关性能实验台，以氟代醚HFE-7100为工质，充灌率为80%，采用水浴加热、水浴冷却的方式调控脉动热管加热和冷却温度，实验研究了不同冷却温度下脉动热管的热开关特性。结果表明：多通路并联式脉动热管完全启动后蒸发段平均温度降低，冷凝段平均温度升高，热阻减小，传热性能迅速提升，温度及热阻变化过程呈现阶梯性骤然变化，可以作为热开关。随冷却温度的升高，热开关闭合时间与开关温度增大，10 ℃冷却温度下热开关闭合时间为12 s，开关温度为59.3 ℃。并且更高的冷却温度下，热开关性能更好，开关比与传热功率增量更大，当冷却温度为30 ℃时，热开关闭合后传热功率增加了26.8 W，开关比为5.05。

Abstract

An experimental platform was built to evaluate the thermal switching performance of a parallel pulsating multi-channel heat pipe using fluoroether HFE-7100 as the working fluid with a liquid filling ratio of 80%. The heating and cooling temperatures of the pulsating heat pipe were controlled using water baths for heating and cooling. The thermal switching characteristics of the pulsating heat pipe at different cooling temperatures were investigated experimentally. The results showed that after the complete start-up of the multi-channel parallel pulsating heat pipe

the average temperature of the evaporation section decreased

the average temperature of the condensation section increased

the thermal resistance decreased

and the heat transfer performance improved rapidly. The temperature and thermal resistance transient processes exhibited a sudden step change

which can be used as a thermal switch. As the cooling temperature increased

the closing time of the thermal switch and the switch temperature increased. At a cooling temperature of 10 ℃

the closing time of the thermal switch was 12 s

and the switch temperature was 59.3 ℃. At higher cooling temperatures

the thermal switch performed better

characterized by a greater increase in the switch ratio and heat transfer rate. When the cooling temperature was 30 ℃

the heat transfer rate increased by 26.8 W following the closure of the thermal switch

with a switch ratio of 5.05.

关键词

Keywords

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