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为研究不同工况砾砂回填条件下土壤源热泵地理管换热器周围温度场的变化规律,通过自主设计的可模拟地下水渗流的砂箱试验台,以砾砂为回填材料,测试了多种工况下地埋管换热器周围的温度场,并利用Surfer软件绘制等温线。结果表明,饱和无渗流条件下,温度场呈圆形对称分布,随着热负荷的增加,温度场达到稳定的时间延长;稳定后的温度变化量增加;温度变化明显区域的范围增大。饱和有渗流条件下,温度场沿渗流方向向下偏移,随着渗流速度的增加,温度场达到稳定的时间缩短;上游各点达到稳定后的温度变化量减小,温度变化明显区域的范围缩小;下游各点达到稳定后的温度变化量先增大后减小,温度变化明显区域的范围扩大。研究成果提供了一种温度场测试的新方法。
In order to study the variation law of the temperature field around the ground source heat pump geoponic heat exchanger under the different working conditions of gravel sand backfilling, a sand box test bench simulating the groundwater seepage was designed to use gravel sand as the backfill material, Under the condition of underground pipe heat exchanger around the temperature field, and the use of Surfer software isotherm. The results show that the temperature field is circularly symmetric under the condition of no seepage and saturated, and the temperature field reaches a steady state with the increase of heat load. The temperature change after stabilization increases and the range of temperature change obviously increases. Under the condition of saturated seepage, the temperature field is shifted downwards along the seepage direction. With the increase of seepage velocity, the temperature field reaches a stable time shortened; the temperature change after the stabilization at each point of the upstream decreases, and the range of obvious temperature changes Reduce; the downstream point of stability after the change of temperature increases first and then decreases, the temperature changes in the region to expand the scope of obvious. The research results provide a new method of temperature field test.