Basics of wind energy conversion.- Analysis of wind regimes.- Wind energy conversion systems.- Performance of wind energy conversion systems.- Wind energy and environment.- Economics of wind energy.

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Wind Energy: Fundamentals, Resource Analysis and Economics

Modelling and simulation of fuzzy-PI control system for a variable speed wind power generator

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Contribuição para as decisões de investimento na energia eólica em Cabo Verde

Modeling and Evaluation of Wind Turbine Operational Strategies During Icing Events

Rising demand for energy due to industrial development has led to the depletion of fossil fuels, which adversely affect climate change due to fossil fuel emissions. Wind energy is one of the most available popular sources of renewable energy are rapid growth. At the present vertical axis wind turbine (VAWT) is one of the kind of machines that used to produce electricity. The aerodynamics of a VAWT are very complex due to the dynamic stall when the blade of the turbine is an airfoil. Low starting torque is the wind turbine disadvantage when the airfoil is used as a blade. A computational fluid dynamic CFD is used to simulate the aerodynamic characteristics of the current model (coupling of the three blades VAWT with a movable vane). (SST) k-ω turbulence and finite volume method were used to solve the aerodynamics of the flow around the current model by using ANSYS FLUENT 16.1 software’s. The finding results from the numerical simulation show that the drag coefficient (Cd), static pressure drop and starting torque are increased in the positive side and decreases in the negative side of the turbine rotor. The movable vanes which are coupled with airfoil for each blade help the coming airflow passing freely between the vanes at the negative blade position in case of all the vanes are totally open, at this case the resistance coming from the air in the airflow direction is reduced to becoming near zero. Reducing the airflow resistance in the negative side of the turbine blades help to increase the rotation of the turbine rotor, then the output power from the turbine increases.

Numerical investigation of the aerodynamic characteristics of a coupling of the three blades VAWT with a movable vanes

A new design of a wind water heater (WWH) is presented. In this new system, the wind energy is directly converted to thermal energy used to heat the water. The wind energy is converted to frictional thermal energy by dissipation within a thin layer of oil. The oil is filled in an annular gap confined between two horizontal concentric cylinders with different diameters; the outer insulating cylinder is rotating while the inner cylinder is fixed. The heat generated is transferred into the inner cylinder then to the heat exchanger. The heat transfer fluid is carrying the heat from the heat exchanger to the water storage tank by mechanical pump. A mathematical model is proposed to model the system mechanical and thermal behavior. The theoretical model has been solved analytically to estimate the amount of thermal energy generated by the system based on a given wind design speed at the site. The theoretical performance of the proposed heater is analyzed and the effects of different design parameters on the heater performance are investigated. The theoretical predictions of the system performance show that the efficiency of proposed wind water heater at design wind speed is equal to 34.8%. The relatively low conversion efficiency of kinetic wind energy to sensible thermal one is due to the limitation imposed by the windmill performance.

Wind Energy: Fundamentals, Resource Analysis and Economics

Citations

Modelling and simulation of fuzzy-PI control system for a variable speed wind power generator

Contribuição para as decisões de investimento na energia eólica em Cabo Verde

Modeling and Evaluation of Wind Turbine Operational Strategies During Icing Events

Numerical investigation of the aerodynamic characteristics of a coupling of the three blades VAWT with a movable vanes

Design of a Wind Water Heater

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