渗流对地铁源热泵前端毛细管换热器性能及围岩温度场的影响
Effect of seepage on the performance of the front-end capillary heat exchanger in subway source heat pump system and the surrounding rock temperature field
季永明 1綦浩宇 1吉程帆 1焦嘉琛 1尹振峰 1胡松涛1
作者信息
- 1. 青岛理工大学 环境与市政工程学院,青岛 266525
- 折叠
摘要
地铁长期运行会引起隧道内的热堆积,影响地铁的安全高效运行.以毛细管为前端换热器的地铁源热泵系统是解决上述问题的有效技术之一.基于某示范工程,建立了隧道衬砌内毛细管换热器仿真模型;分析了典型工况下,渗流对其传热特性及隧道围岩温度场的影响.结果显示,渗流会显著扩大换热器的热影响范围,最远可达围岩下游 70 m处;与无渗流工况相比,渗流可显著提高换热器的效率,且二者逆流时,提升效果更明显,供冷季为 3.20 倍,供暖季为 2.55 倍;渗流可显著减弱围岩的热堆积.本研究可为地铁源热泵前端换热器的设计提供理论支撑.
Abstract
Long-term operation of subway will cause heat accumulation in the tunnel,which will affect the safe and efficient operation of subway.The subway source heat pump system with front-end capillary heat exchanger is one of the effective technologies to solve the above problem.Based on a demonstration project,a simulation model of the capillary heat ex-changer in the tunnel lining was established.The influence of seepage on the heat transfer characteristics of the capillary heat exchanger and the surrounding rock temperature field un-der typical working conditions was analyzed.The results show that the seepage can signifi-cantly expand the heat influence range of the heat exchanger,up to 70 m downstream of the surrounding rock.Compared with the condition without seepage,the efficiency of the heat exchanger can be significantly improved by seepage,and the improvement effect is more ob-vious when the two flow upstream,which is 3.20 times in the cooling season and 2.55 times in the heating season.The thermal accumulation of surrounding rock can be significantly weakened by seepage.This study can provide theoretical support for the design of the front-end heat exchanger of the subway source heat pump system.
关键词
地铁/热堆积/供热/换热器/渗流/热泵Key words
subway/heat accumulation/heating/heat exchanger/seepage/heat pump引用本文复制引用
基金项目
国家自然科学基金资助项目(52108079)
出版年
2024
NETL
NSTL
维普
万方数据