Measured analysis of heating performance in a medium-deep and shallow coupled ground-source heat pump system

Aiming at the medium-deep and shallow coupled ground-source heat pump system, this paper presents the operation modes of the cascade utilization system under the different heating loads. The actual heating performance of the coupled system is obtained through the continuous monitoring of a project in the whole winter. The analysis results show that the heat extraction temperature of medium-deep wells is 53 ℃ higher than that of shallow wells, and the heat extraction is 5.6 times higher than that of shallow wells. The medium-deep ground heat extraction in cascade utilization mode doubles the amount of the non-cascade utilization mode. The heat supply from the medium-deep ground energy of 30% is provided by the primary heat exchange, and 70% by the heat pump secondary heat exchange. The results show the proportion and advantages of the energy cascade utilization of the medium-deep and shallow coupled ground-source heat pump system.