圆形隧道衬砌内毛细管前端换热器流-热耦合传热模型

Flow-heat coupled heat transfer model of capillary front heat exchanger in circular tunnel lining

隧道衬砌内置毛细管前端换热器(CHE)的热泵系统是解决地铁运营高能耗和隧道热堆积问题的有效途径之一。以青岛地区某示范工程为对象,对其CHE的物理模型合理简化,建立了基于面热源假设的圆形复合介质内CHE流-热耦合传热模型,采用理论与数值相结合的方法,求得了该耦合传热模型的解。基于理论模型及上述求解方法,在TRNSYS平台搭建了CHE流-热耦合传热模型仿真模块。采用现场毛细管换热器传热性能测试数据对模型进行了验证,结果表明,该仿真模块运行可靠且精度满足工程需要。该传热模型为地铁源热泵系统的设计提供了理论基础。

The heat pump system with built-in capillary front heat exchanger(CHE)in the tunnel lining is one of the effective ways to solve the problems of high energy consumption in subway operation and heat accumulation in the tunnel.This research takes a demonstration project in Qingdao area as the object,and rationally simplifies the physical model of CHE.A heat transfer model of CHE flow-heat exchange inside a circular composite medium based on the assumption of a surface heat source is established.The solution of the coupled heat transfer model is obtained by adopting a combination of theory and numerical methods.Based on the theoretical model and the above-mentioned solution method,a CHE flow-heat coupled heat transfer model simulation module is built on the TRNSYS platform.The model is verified with the test data of the heat transfer performance of the on-site capillary heat exchanger.The results show that the simulation module is reliable in operation and the accuracy meets the needs of the project.This heat transfer model provides a theoretical basis for the design of the subway source heat pump system.