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Feasibility of a new helical blade structure for a PV integrated wind turbine in a heat-driven swirling wind field

He, Yuanping, Zhang, Mingxu, Li, Weijun, Su, Junwei, Kase, Kiwamu, Yu, Chuck Wah, Gu, Zhaolin
Energy 2019 v.185 pp. 585-598
energy, fluid mechanics, heat, industrial applications, mathematical models, solar collectors, solar energy, temperature, vanes, wind, wind power, wind turbines
A controllable heat-driven swirling wind turbine system was integrated with a photovoltaics (PV) system for energy generation in a heat-collecting shed. This is a brand-new type of a wind energy generation system; and a helical three-blade structure in a vertical axis was introduced. The stationary pre-rotation vanes have a variable diameter and a helical twist angle of 225°. A numerical simulation was conducted to investigate the feasibility of a wind turbine blade structure for efficient energy output for industrial application. The computational fluid dynamics (CFD) tool OpenFOAM was used to simulate the operating conditions of the wind turbine. The findings illustrated the efficacy of the new system. The new helical blade structure is efficient for wind energy output of the turbine in a swirling wind field. The simulation under different heat source temperatures illustrated that an increase in heat source temperature could increase the output efficiency of the wind turbine energy system. The increment in output efficiency could be up to 19.07% when the temperature rises from 40 K to 80 K. The PV-swirling wind integrated system was shown to be more economical than a single solar photovoltaic system because its investment payoff period could be shortened by 2 years.