In order to realize stable and efficient utilization of solar energy and geothermal energy

a combined complementary utilization system of solar energy and geothermal energy was designed. Firstly

the mathematical modeling for four subsystems constituting the joint complementary utilization system was carried out

and toluene and R410A were selected as the heat transfer fluids in the heat-power conversion system and the heat pump unit

respectively. Then

the EBSILON software was used to couple the four subsystems as well as to set design parameters. The data of meteorological parameters and geothermal parameters in heating season in a certain area of Zhengzhou were input

and the key indicators such as power generation and heating of the solar and geothermal combined complementary system were studied. The simulation study showed that

the heat supply of the solar system was stable at a minimum of 27.23 kW

and increased with the solar radiation. The heat supply of the geothermal unit was generally 160.26 kW

and the heat supply of the geothermal unit increased by 6.30 kW for every 5 ℃ increase in the temperature of the imported geothermal water. The heat supply of the geothermal unit decreased when the heat supply of the solar system increased

which could effectively complement the solar energy to increase the energy utilization rate and improve the stability of the system heating. This research can provide a theoretical basis for engineering application of solar energy and geothermal energy clean heating.