| 摘要: |
| 隧道地源热泵是解决地铁隧道热污染的有效技术之一，毛细管换热器（CHE）因具有抗腐蚀、易弯曲、换热性能好、节省空间等优点被广泛应用于隧道地源热泵系统的前端换热器。基于示范工程建立了CHE流-热耦合传热模型，并在TRNSYS平台搭建CHE仿真系统，对隧道衬砌内CHE在连续、间歇运行下的传热性能进行分析。结果显示，当运行时间比由1/3逐渐增至1时，制冷季和采暖季第7日的CHE日均热流密度分别由100.59、87.42 W/m2降至78.14、68.62 W/m2，相应的围岩内表面温度分别随之增大和减小，表明间歇运行能显著提高换热器的传热性能，并有助于缓解隧道围岩冷热堆积问题。 |
| 关键词: 可再生能源 热泵 毛细管 间歇运行 传热性能 |
| DOI： |
| Received:December 08, 2022Revised:April 28, 2023 |
| 基金项目:国家自然科学基金（52108079）资助 |
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| Heat Transfer Performance of Capillary Heat Exchangers in Circular Tunnel Lining during Intermittent Operation |
|
Jiao Jiachen1, Ji Yongming1, Zhang Fengjun2, Ji Chengfan1, Yin Zhenfeng1, Hu Songtao1
|
| (1.School of Environmental and Municipal Engineering, Qingdao University of Technology;2.Qingdao Metro Group Co., Ltd.) |
| Abstract: |
| Tunnel ground-source heat pumps are effective in solving the thermal pollution problem in subway tunnels. A capillary-tube heat exchanger (CHE) is used as the front-end heat exchanger of the tunnel ground-source heat pump system because of its corrosion resistance, easy bending, good heat transfer performance, and compactness. In this study, a CHE fluid-thermal coupling heat transfer model is established based on a demonstration project, and a CHE simulation system is built on the TRNSYS platform to analyze the heat transfer performance of the CHE in tunnel linings under continuous and intermittent operation. When the run-time ratio increases from 1/3 to 1, the average daily heat flux of CHE in the cooling and heating seasons decreases from 100.59 W/m2 and 87.42 W/m2 to 78.14 W/m2 and 68.62 W/m2 after 7 days, respectively, whereas the inner surface temperature of the surrounding rock increases and decreases in the cooling and heating seasons, respectively. The results show that intermittent operation can significantly improve the heat transfer performance of the heat exchanger and help alleviate the problem of cold and heat accumulation in the rock surrounding the tunnel. |
| Key words: renewable energy heat pump capillary tube intermittent operation heat transfer performance |
