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
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.
NETL
NSTL
万方数据
维普
