Exergy analysis and experiment research of solar assisted water source heat pump system

The work principle composition and operation mode of solar assisted water source heat pump system were introduced, and the exergy analysis model of the system and simulation mathematical model of solar collector system were build. The solar collector system was simulated, the system was tested, and the exergy analysis was made based on the test and simulation results. The results indicate that the solar assisted water source heat pump system is an energy-saving cold and heat source system for building, the COP of heating changes between 3.2-3.6, the comprehensive COP in heating and cold storage (or cold recycling) mode changes between 5.8-6.2; the exergy efficiency is the highest when the collector standard temperature to connect Ton of the system is set at 20°C, and the collector standard temperature to disconnect Toff should not be set at less than 8°C; The exergy efficiency of the system in cold storage mode is about 25% higher than in cold release mode; There is a great exergy loss rate at the circulating pump, reaching about 22%, to improve the exergy efficiency of the system, the average temperature of the water input and output from the evaporator should be set to 5-19°C.