Current Status and Outlook of Research on Hybrid Ground Source Heat Pump System in Severe Cold Regions with Dominant Heat Loads

The advancement of hybrid ground source heat pump system (HGSHPS) is crucial for achieving the green and low-carbon transition in China’s heating industry. In extremely cold places where heat demand prevails, the prolonged operation of a single ground source heat pump system (GSHPS) induces thermal imbalance issues. This research examines multi-source synergistic approaches to managing building cooling and heating loads mostly influenced by GSHPS. It separately introduces the predominant HGSHPS and compares their applicability across various areas. The research indicates that the solar-assisted ground source heat pump system (SA-GSHPS) cooperative heating system effectively addresses the soil heat imbalance caused by uneven heat extraction and supplementation in this area; furthermore, the cross-seasonal heat storage technology exhibits significant potential for development. This paper proposes a hybrid heating system that integrates an air source heat pump system (ASHPS) and a GSHPS, designed to address the thermal imbalance issue in cold regions while minimizing energy consumption through multi-mode system switching. It offers novel insights for advancing theoretical research and enhancing the energy-efficient operation of HGSHPS.