运行模式对毛细管换热器换热性能影响研究

Study on the influence of operation mode on the heat transfer performance of capillary heat exchanger

利用地源热泵系统实现地铁隧道中热量的转移,不仅缓解了隧道热堆积问题,还有效利用了可再生能源.以地源热泵系统毛细管前端换热器为研究对象,利用基于TRNSYS软件所建立的传热模型,通过实测数据验证了其正确性,研究了运行模式对毛细管换热性能的影响情况,模拟计算了毛细管与周围岩体及隧道空气之间的传热过程,分别分析了连续运行以及不同间歇运行工况时毛细管换热性能的变化情况,间歇运行有利于提高毛细管前端换热器的换热性能,间歇运行日运行时间小于等于8 h时,夏季时毛细管单位面积换热量可提高18%,冬季时提高28%.

Using ground source heat pump system to realize heat transfer in subway tunnel not only alleviates the problem of heat accumulation in the tunnel,but also effectively exploits renewable energy.With the capillary front-end heat exchanger based on ground source heat pump system as the research object,this paper establishes the heat transfer model by using TRNSYS software.Its validity is verified by the measured data.The influence of operation mode on capillary heat transfer performance is studied,and the heat transfer process among the capillary,the surrounding rock and the tunnel air is simulated,and the changes of capillary heat transfer performance in continuous and different intermittent operation are analyzed respectively.Intermittent operation is beneficial to improve the heat transfer performance of the capillary front-end heat exchanger.When the daily running time of intermittent operation is less than or equal to 8 hours,the heat exchange per unit area of capillary can be increased by 18%in summer and 28%in winter.