地热热管融雪系统应用研究

APPLICATION STUDY OF GEOTHERMIC HEAT PIPE SNOW MELTING SYSTEM

基于热管技术,设计"地热热管道路融雪系统",采用重力式热管将恒温层中的热量传递到道路表面以防止积雪。通过对热管及土壤中传热过程的分析,建立热管当量对流换热系数的物理模型,形成模拟热管在土壤中换热过程的有效数值方法。通过对融雪系统的三维非稳态数值模拟,得到热管运行30d内土壤温度分布的变化过程。数值计算结果显示,所设计的融雪系统能有效提高路面温度、防止积雪,可长期运行且无需外加动力,具有重要的工程应用价值。

By using the heat pipe technology, a ＂geothermic heat pipe snow melting system＂ was designed, gravity type heat pipes were used to transfer energy from the soil thermostat layer to road surface to prevent snow accumulating. Basing on the analysis of heat transferring process of heat pipe and soil, an efficient heat convection model of heat pump was built; a proper method to simulate the heat transferring process of heat pipe in soil was also developed. Changes of soil temperature distribution in 30 days after the starting of this snow melting system were studied by simulating the 3D unsteady model. According to the simulation results, the ＂geothermic heat pipe snow melting system＂ is proved to be efficient to improve the road surface temperature and prevent snow accumulating. This system can work steadily for a long time without any additional power system, so it is meaningful and environmentallyfriendly to be used in road, airport and square constructions.