Photovoltaic/thermal integrated air source heat pump hot water system with phase change tank

Add phase change materials can significantly improve the stability of the solar water heating system, but at the same time increase the complexity of the system. To solve the design problem of the key parameters of the photovoltaic/thermal integrated air-source heat pump (PVT-ASHP) hot water system, a simulation model of the PVT-ASHP hot water system with coupled phase-change tanks based on TRNSYS was established. Taking a civil building in Zhengzhou as the research object, the influence of four key parameters of hot water collection tank volume, PVT area, inclination angle and circulation flow on system performance is analyzed. Taking overall efficiency as the goal, the influence degree of four parameters on system performance is obtained by orthogonal experiment and range analysis method, and the optimal parameters are determined. The results show that the COP of the PVT-ASHP hot water system with coupled phase change tanks can reach 3.92, which is an 18.07 % improvement over the conventional PVT-ASHP system, and at the same time exhibits lower energy consumption and higher power generation performance. Among the four parameters considered, the influence degree of system performance is tank volume, PVT area, circulating flow rate and inclination angle in turn, and the overall efficiency is up to 76.28 %. The research results can provide a theoretical basis for the performance optimization design of PVT-ASHP hot water system.