地埋管回填材料传热性能的研究与分析

Research and analysis of heat transfer performance of buried pipe backfill material

当回填材料导热系数大于周围岩土层,对地埋管换热器换热性能提升效果开始逐步递减。研究回填材料增益效果递减的原因,对提高总系统运行效率具有重要意义。通过软件平台Workbench对地埋管换热器在回填材料导热系数不同的情况下进行模拟。结果显示,回填材料在整个传热过程中主要起到疏导热量,扩大导热面积的作用。回填材料导热系数较高时,可通过提高进水管水温进一步开发系统换热效率。

when the thermal conductivity of backfill material is larger than that of surrounding rock and soil layer,the improvement effect of heat transfer performance of buried pipe heat exchanger begins to decrease gradually.It is of great significance to study the reason of decreasing gain effect of backfill material to improve the operation efficiency of the total system.By software platform workbench the buried pipe heat exchanger is simulated under the condition of different thermal conductivity of backfill material.The results show that the backfill material mainly plays the role of dredging heat and expanding the heat conduction area in the whole heat transfer process.When the thermal conductivity of backfill material is high,the heat transfer efficiency of the system can be further developed by increasing the water temperature of intake pipe.