Performance analysis of multi-source district heating system integrated with geothermal and energy storage

Abstract

District integrated heating technology combined with renewable energy is an effective way to achieve the goal of peak carbon emissions and carbon neutrality. Based on geothermal sources, air source heat pumps, and inter-seasonal energy storage technology, a multi-source integrated district heating system is proposed, which can meet the requirement of space heating in buildings. Taking a residential community with an area of 35700 m2 as the application scenario, the thermal resistance- thermal capacity node network model (TRCM) of the borehole field and the thermodynamic model of the heat pump are developed. Then, the energy consumption and carbon emission performance of the heating system are achieved. The results indicate that the primary energy consumption of the multi-source district heating system is 45.73% less than the coal-fired boiler and the carbon emission reduces 787.83 tCO2. The multi-source heat pump system can achieve social benefit, with the help of reasonable dispatching between the source and load side, and the contribution of renewable energy. The long-term stable operation of the energy system can be achieved. This study can provide a theoretical reference for the development of integrated energy systems combined with geothermal energy.