地下水渗流对垂直埋管换热器换热性能影响的实验研究

地埋管换热器的换热性能是地源热泵空调系统设计的关键问题之一。建立了地源热泵砂箱实验台,实验研究了地下水渗流对地源热泵地埋管换热器换热性能的影响。研究结果表明:地下水渗流可以强化地埋管的换热,且随着渗流速度的增大,强化换热作用越明显。另外,实验结果也表明,U型管周围温度峰值的位置会沿渗流方向向下游偏移,地埋管群布置时应避开该位置,以强化埋管的换热。

Experiment on the Factors that Ground Water Flow Influence the Performance of the Heat Exchanger

To determining the capacity of the ground heat exchanger is one of the key issues of Ground-Source Heat Pump system. In this paper, a Ground-Source Heat Pump experiment rig with sand box was established, and the experiments on the influence of ground water flow rate and the performance of the heat exchanger were conducted. The experimental results show that ground water enhances heat transfer of underground pipe heat exchanger. With the groundwater flow rate increasing, heat transfer enhancement is visible. In addition, the results show that the position of the highest temperature around the U-tube will shift to the lower reaches along the flow direction. Therefore, in order to enhance the heat transfer, multi-pipe arrangement should consider this factor and avoid the position.