Energy and exergy efficiency comparison of horizontal and vertical axis wind turbines

Pope, Kevin; Dinçer, İbrahim; Naterer, G.F.

doi:10.1016/j.renene.2010.02.013

Cited by 221 publications

(112 citation statements)

References 18 publications

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“…These turbines are typically composed of two or three arc-type blades. Savonius turbines have the following advantages over other types of wind turbines: (1) ability to operate under complex turbulent flows [2]; (2) low rotation speed and noise emission [3]; (3) high starting torque, good starting performance [4]; and (4) simple structure and low cost.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

et al. 2015

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Abstract:The Savonius wind turbine is a type of vertical axis wind turbine (VAWTs) that is simply composed of two or three arc-type blades which can generate power even under poor wind conditions. A modified Savonius wind turbine with novel blade shapes is introduced with the aim of increasing the power coefficient of the turbine. The effect of blade fullness, which is a main shape parameter of the blade, on the power production of a two-bladed Savonius wind turbine is investigated using transient computational fluid dynamics (CFD). Simulations are based on the Reynolds Averaged Navier-Stokes (RANS) equations with a renormalization group turbulent model. This numerical method is validated with existing experimental data and then utilized to quantify the performance of design variants. Results quantify the relationship between blade fullness and turbine performance with a blade fullness of 1 resulting in the highest coefficient of power, 0.2573. This power coefficient is 10.98% higher than a conventional Savonius turbine.

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Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

et al. 2015

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“…The HAWT can achieve higher energy efficiencies and is capable to self-start at low wind speed but it only operates under one wind direction and thus requires a yaw mechanism to direct the turbine into the wind. It also has a high cost of maintenance and repairs due to the tower structure and the placement of the transmission and electrical generation equipment at the hub [9]. Furthermore, it is dangerous to surrounding birds and has a high noise level so it is not suitable for the urban environment [12].…”

Section: Introductionmentioning

confidence: 99%

“…The slope of the roof has an effect on the wind speed over the buildings [8]. The significant improvement in the operating efficiencies of wind power systems makes them more economically competitive to other energy generation techniques [9]. At present, two main categories of wind turbines have been used for electricity generation based on the axis about which the wind turbines rotate; the horizontal axis wind turbines (HAWTs) and the vertical axis wind turbines (VAWTs) [10,11].…”

Section: Introductionmentioning

confidence: 99%

Design and Testing of a Novel Building Integrated Cross Axis Wind Turbine

et al. 2017

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Abstract:The prospect of harnessing wind energy in urban areas is not promising owing to low wind speeds and the turbulence caused by surrounding obstacles. However, these challenges can be overcome through an improved design of wind turbine that can operate efficiently in an urban environment. This paper presents a novel design of a building integrated cross axis wind turbine (CAWT) that can operate under dual wind direction, i.e., horizontal wind and vertical wind from the bottom of the turbine. The CAWT consists of six horizontal blades and three vertical blades for enhancing its self-starting behavior and overall performance. The study employed a mock-up building model with gable rooftop where both of the developed CAWT and the conventional straight-bladed vertical axis wind turbine (VAWT) are mounted and tested on the rooftop. The height of the CAWT and the VAWT above the rooftop was varied from 100 to 250 mm under the same experimental conditions. The results obtained from the experimental study showed that there is significant improvement in the coefficient of power (C p ) and self-starting behavior of the building integrated CAWT compared to the straight-bladed VAWT. At 100 mm height, the C p,max value of the CAWT increased by 266%, i.e., from 0.0345 to 0.1263, at tip speed ratio (TSR) (λ) of 1.1 and at wind speed of 4.5 m/s. Similar improvements in performance are also observed for all condition of CAWT heights above the rooftop where the CAWT outperformed the straight-bladed VAWT by 196%, 136% and 71% at TSR of 1.16, 1.08, and 1.12 for Y = 150, 200, and 250 mm, respectively. Moreover, the CAWT performs better at 10 • pitch angle of the horizontal blade compared to other pitch angles.

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“…These are the main reasons for recently growing popularity of VAWT type constructions. To support these predictions, Pope presented a preliminary analysis of the effectiveness of various options of HAWT and VAWT, in the context of the first and second law of thermodynamics [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and preliminary validation of drag-based vertical axis wind turbine

Krysinski¹,

Buliński²,

Nowak³

2015

Archives of Thermodynamics

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The main purpose of this article is to verify and validate the mathematical description of the airflow around a wind turbine with vertical axis of rotation, which could be considered as representative for this type of devices. Mathematical modeling of the airflow around wind turbines in particular those with the vertical axis is a problematic matter due to the complex nature of this highly swirled flow. Moreover, it is turbulent flow accompanied by a rotation of the rotor and the dynamic boundary layer separation. In such conditions, the key aspects of the mathematical model are accurate turbulence description, definition of circular motion as well as accompanying effects like centrifugal force or the Coriolis force and parameters of spatial and temporal discretization. The paper presents the impact of the different simulation parameters on the obtained results of the wind turbine simulation. Analysed models have been validated against experimental data published in the literature.

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Energy and exergy efficiency comparison of horizontal and vertical axis wind turbines

Cited by 221 publications

References 18 publications

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

Computational Fluid Dynamics Prediction of a Modified Savonius Wind Turbine with Novel Blade Shapes

Design and Testing of a Novel Building Integrated Cross Axis Wind Turbine

Numerical modeling and preliminary validation of drag-based vertical axis wind turbine

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