Performance analysis of a solar energy coupled air-source and water-source heat pump composite heating system

This paper proposes a solar energy coupled air-source and water-source heat pump composite heating system which is suitable for Northern China. Taking a railway station area as an example, the TRNSYS simulation model and optimization model are established to analyse the performance of the system, and the equipment capacity and operation characteristics under different guarantee rates are obtained. The results show that the combined heating system has a high and stable water supply temperature, the average water supply temperature reaches 60 ℃, and it has strong adaptability to outdoor environments and heating ends. The system can maximize the use of solar energy and improve the utilization rate of solar energy. Compared with the air-source and water-source heat pump superposition heating system without solar energy, the comprehensive energy efficiency of the system has been improved by 22.5%-117.8%, with an average increase of 67.96%. The research results provide a feasible heating scheme for railway houses in severe cold and cold zones in the north.