Performance Study of Alternate Operation Mode of Solar PV/T-GSHP System for Building Heating in Northern China

Aiming at the current clean energy heating hot spots in northern China, two-layers of independent residential building in a typical cold region of Beijing is used as a heating object to establish a PV/T-GSHP system model with PV/T collectors coupled with GSHPs. The heat load is modeled and calculated using Sketchup software combined with TRNBuild plug-in, and the building water supply temperature is controlled and simulated to operate during the heating season using the software TRNSYS. The results show that the system building water supply temperature range is 45.54–56.31 °C, which basically meets the winter heating set temperature. Typical daily PV efficiency values range from 14.24 to 20.74%, typical annual power generation is 910.02 kW h, and system energy consumption is 5730.37 kW h, which is equivalent to PV power generation saving 15.88% for the system. The system can achieve stable water supply temperature in winter, which is suitable for clean energy utilization and carbon emission reduction in northern China.