Experimental analysis of soil temperature field with ground-source heat pump system

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.