Simulation Study On Photovoltaic Photothermal Coupled Ground Source Heat Pump Cogeneration

Abstract

The TRNSYS model of photovoltaic photothermal coupled ground source heat pump cogeneration system is established in this paper. The weather data of Baotou, Inner Mongolia are used to simulate the whole year operation of the system. The influence of different cooling water flow rate and collection tank volume on power generation is analyzed. The energy consumption of energy storage systems with and without hydrogen production is analyzed and compared. It is concluded that different cooling water flow rate and different collection tank volume have little effect on the system power generation. In the heat collection season, the water temperature at the inlet of the buried pipe increases with the increase of solar radiation intensity, and the photoelectric conversion efficiency decreases with the increase of photovoltaic panel temperature. The combination of the CHP system and the hydrogen production system can absorb the discarded light and increase the energy utilization rate of the system by about 3.5%. The photovoltaic photothermal coupled ground source heat pump system is compared with the ground source heat pump system. When the ground source heat pump runs separately for heating for ten years, the soil temperature drops from the initial set of 13℃ to 1.58℃, and the temperature decreases by 11.42℃. Soil temperature decreased significantly and soil cold accumulation was serious. The photovoltaic photothermal coupled ground source heat pump system can maintain the soil temperature balance, the system runs for 10 years, the temperature only reduces 0.38℃. The COP of heat pump unit is also higher than that of ground source heat pump individual heating system.