制冷学报2024，Vol.45Issue(2)：53-61,9.DOI:10.3969/j.issn.0253-4339.2024.02.053
圆形隧道衬砌内毛细管换热器间歇运行的传热性能
Heat Transfer Performance of Capillary Heat Exchangers in Circular Tunnel Lining during Intermittent Operation
摘要
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.关键词
可再生能源/热泵/毛细管/间歇运行/传热性能Key words
renewable energy/heat pump/capillary tube/intermittent operation/heat transfer performance分类
建筑与水利引用本文复制引用
焦嘉琛,季永明,张凤君,吉程帆,尹振峰,胡松涛..圆形隧道衬砌内毛细管换热器间歇运行的传热性能[J].制冷学报,2024,45(2):53-61,9.基金项目
国家自然科学基金(52108079)资助项目.(The project was supported by the National Natural Science Foundation of China(No.52108079).) （52108079）
