Design and application of an integrated energy system combining middle-depth ground-source heat pump, water heat storage and photovoltaics: Taking a residential complex in cold zone as an example

This paper presents an integrated energy system design scheme that combines middle-depth ground-source heat pump, water heat storage, and photovoltaics for heating a large residential complex in cold zone. The study uses DeST software to simulate heating loads and PVsyst software to forecast power generation. Based on this, an operation strategy for the integrated energy system is designed to match the supply and demand at the building end, considering the thermal storage tank capacity, the characteristics of photovoltaic power generation, the heating load characteristics of the building, and the characteristics of municipal power supply in different time periods. A comparative analysis is also conducted with traditional gas boiler systems and traditional middle-depth ground-source heat pump systems. The results show that the integrated energy system has significant advantages in reducing operating costs and carbon emissions.The average annual photovoltaic absorption rate of the integrated energy system is 77.67%, which can save 83.44% of the operating costs and reduce carbon emissions by 77.66% compared with the gas boiler system.