基于有限元法的垂直地埋管换热器传热研究

Finite element analysis of heat transfer in vertical ground heat exchangers

根据能量守恒原理,对地埋管换热器建立二维传热模型。运用Ansys热分析软件,采用热传导的有限元瞬态分析方法,对地源热泵垂直埋管与回填材料及岩土间的传热进行数值模拟与分析。根据合肥地区某住宅的地源热泵工程的相关设计资料,分析了垂直埋管在岩土中传热的温度场及温度梯度场的影响大小及范围,对地埋管在1个周期运行后对岩土体的温度恢复情况的影响进行了数值分析,结果表明:对于地处夏热冬冷的合肥地区,较适宜应用地源热泵系统,岩土温度的自平衡性较好。

This paper sets up a two-dimensional heat transfer model for the vertical ground heat exchanger on the basis of energy conservation principle. The ANSYS Thermal software is introduced to simulate and analyze the transient heat transfer between the buried pipes, the backfill and the soil by means of the finite element method. On the basis of the related design data of a residential geothermal heat pump project in Hefei City, the temperature field and thermal gradient field of the soil are presented. The soil temperature change in a cycle as well as the thermal restoration capability of the soil is also analyzed. The result shows that the ground heat pump system is suitable for the region which is hot in summer and cold in winter, such as the Hefei area, and the soil has good self-balancing capability.