地埋管地源热泵土壤温度场实验分析
Experimental analysis of soil temperature field with ground-source heat pump system
摘要：
利用地埋管地源热泵实验系统，研究了地埋管地源热泵在冬季供暖和夏季制冷工况下，埋管间距分别为5.65 m和4 m情况下，地下土壤温度随时间的变化；在夏季制冷工况下，对比了两种埋管间距下，地埋管热干扰现象对热泵机组运行效率的影响；研究了夏季制冷工况下，埋管间距为5.65 m时，热泵采取间歇性运行方式下地下土壤温度随时间的变化。结果显示，埋管间距为5.65 m时，周围土壤温度变化幅度较小，地埋管换热器换热效果更好，比埋管间距为4 m情况下约节能13%；与连续运行方式相比，间歇运行方式下热泵机组的运行效率约提高7%。
Abstract：
Based on an experimental system of the ground-source heat pump, studies the variation of underground soil temperature with time in winter and summer conditions when the buried pipe spacing are 5.65 m and 4 m, respectively. In summer condition, compares the influences of the thermal interference on the operational efficiency of heat pump units with different buried pipe spacing. In summer condition, studies the change of underground soil temperature with time when the heat pump unit adopts intermittent operation mode and the buried pipe spacing is 5.65 m. The results show that when buried pipe spacing is 5.65 m, the variation of soil temperature is small. In this case, the heat transfer performance of the underground heat exchanger is better, and the energy consumption reduces by about 13% than that in the case of buried pipe spacing of 4 m. Meanwhile, the operational efficiency of the heat pump unit improves by about 7% in intermittent operation mode than that in continuous operation mode.
Keywords:ground-source heat pump, temperature field of soil, buried pipe spacing, thermal interference, operational efficiency, intermittent operation