In order to study the operational characteristics of a combined solar photovoltaic-thermal system and multi-source heating system

an experimental platform for a solar photovoltaic-thermal combined dual-source heat pump system was constructed. The system was tested in heating

cooling

and hot water production modes

with a focus on analyzing the heat output

COP

electricity consumption

etc.

when heating from the PV/T source and air source in heating hot water production and heating modes. The impact of heating from the PV/T water tank on the electrical and thermal efficiency of the PV/T panel was also examined

along with an analysis of the system's energy saving performance during actual operation. The experimental results indicate that in heating mode during cold and sunny winter weather

the average COP of the heat pump unit is 2.18

while the system's average COP is 3.17

with heating from the PV/T source accounting for 61.57% of the operating time. In the hot water production mode

at the same heating temperature

the heat pump performance is superior when heating from the PV/T source compared to heating from the air source. Heating from the PV/T water tank can effectively reduce the temperature of the PV/T panel

thereby enhancing its electrical and thermal efficiency.