A solar-assisted ground-source heat pump system is an excellent way of supplying clean energy in extremely cold regions. In this system

the solar energy collection and storage system has different connection and operation modes from the ground-source heat pump system. The running time of the solar system directly affects the thermal recovery characteristics of the soil. In this study

a solar-assisted ground-source heat pump system with annual heat storage was established based on the TRNSYS platform. A simulation calculation method for a soil heat accumulator with double independently buried pipes was proposed. The simulation results were compared to the field test data. Based on the actual project of a public building in Dalian

the operating parameters

which greatly influence the total operating energy consumption and the soil temperature change rate of the system

were obtained using an orthogonal experimental design and TRNSYS simulation. Their influence laws were subsequently analyzed. The results showed that the total operating energy consumption of the system positively correlated with the water supply temperature of the heat pump in winter

load-side water flow rate

and soil-side water flow rate. It negatively correlated with the water supply temperature of the heat pump in summer. When the cumulative heating and cooling capacity ratio was 1.31

the total operating energy consumption of the system negatively correlated with the start-up temperature of the heat storage. When the ratio was 2.32

it positively correlated with the start-up temperature of heat storage and when the ratio was 1.77

the start-up temperature of heat storage was 35 °C

and the energy consumption of the system was the lowest. The change rate in the soil temperature is negatively correlated with the start-up temperature of heat storage. The operating time and parameters of the solar system were adjusted according to the heating and cooling ratios of the system.