Heat Exchanger Under The Action Of Seepage Coupling Heat Transfer Simulation And Experimental Research

In recent years, ground source heat pump as an energy saving, environmental protection technology has been widely studied an applied. The keystone of study focus on how to improve the heat transfer performance of ground source heat pump ground heat exchanger, in order to improve the operation efficiency of ground source heat pump and better realize the purpose of energy saving and emission reduction.In this paper, we consider the groundwater seepage in the soil. The GAMBIT was used to establish the physical model of soil with and without groundwater seepage. The ANSYS13.0was used to calculation the model. In the condition of without seepage, this paper analyzed the heat transfer performance of ground heat exchanger at different flow velocity within tubes and obtained the ground temperature field thermal influencing radius. The results show that the heat transfer is enhanced of ground heat exchanger with the increase of flow velocity within tubes. Continuing to increase the flow velocity within tubes has little effect of enhancing the heat transfer when the velocity is0.9m/s. In the condition of with seepage, this paper analyzed the effect of different velocity of seepage and soil porosity on the heat transfer performance. The results show that seepage deforms the ground temperature field and enhances the heat transfer. The heat transfer performance was increased by0.83%and8.83%when the velocity of groundwater seepage were1X10-(?)m/s and3×10-6m/s. The heat transfer rate of ground heat exchanger increases with the increasing in soil porosity.In order to check the accuracy of the coupled thermal conduction and groundwater advection model, this paper built a model experiment table based on the theory of similarity. Tests were carried out on ground heat exchanger with and without groundwater seepage in summer. The results of experiment are in a good accordance with the simulation results, thus verify the heat transfer law described by the analytical solution of the coupled thermal conduction and groundwater advection model of buried pipe.