Abstract：

Using an experimental sandbox of single well cycling ground heat exchanger system, according to the heating and cooling period in Shenyang, carries out an experimental research on energy storage characteristics in two operating modes of summer-winter and winter-summer. The results show that the ability of aquifer temperature recovery is poor, and the aquifer temperature cannot return to its initial state during the intermittent period. In the heat load dominated area, assistant technology must be used during the operating of pumping and recharging well. Heat supply of the aquifer is needed to ensure long-term reliable operating of system. Suggests that the system firstly operates in the heat release condition in summer to supply the aquifer storage heat, and then the heat absorption is carried out in winter. The outlet water temperature and the coefficient of performance (COP) of heat pump system are both kept at a high level.