Feasibility analysis of a Darrieus vertical-axis wind turbine installation in the rooftop of a building

Balduzzi, Francesco; Bianchini, Alessandro; Carnevale, Ennio Antonio; Ferrari, Lorenzo; Magnani, Sandro

doi:10.1016/j.apenergy.2011.12.008

Cited by 240 publications

(101 citation statements)

References 11 publications

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“…Therefore, the performance of the CAWT increases with increase in skewed angle. Similarly, improvement in the performance of VAWT turbine due to skewed flow is reported in [6,33,56].…”

Section: Variation Of Height Above the Rooftopmentioning

confidence: 99%

“…Therefore, the performance of the CAWT increases with increase in skewed angle. Similarly, improvement in the performance of VAWT turbine due to skewed flow is reported in [6,33,56]. To verify the experimental result on the variation of height of CAWT above the rooftop (Figures 14 and 15), a simple CFD simulation was carried out to calculate the skewed angle (Figure 16) of the wind at the rooftop shown in Section 4 ( Figure 8a).…”

Section: Variation Of Height Above the Rooftopmentioning

confidence: 99%

“…However, Wind resource in the urban environment is complicated where the resource is proportionate to the surface topography, temperature influences and the dynamic nature of the urban environment [5]. Because of the high roughness length of the environment and the presence of obstacles characterized by different shapes and porousness along the flow stream path, the wind profile in urban areas is entirely not quite the same as the classical log-law based profile with the zero-speed elevation shifted up to a peculiar value (displacement, d) which is a function of the average height of the neighboring buildings ( Figure 1) [6]. The wind speed increases logarithmically with height.…”

Section: Introductionmentioning

confidence: 99%

“…According to the recent literature on self-starting ability of the H-Darrieus wind turbine, Dominy et al [16] and Hill et al [17] demonstrated that it is possible to have a self-start three-bladed H-rotor VAWT using Figure 1. Wind profile in the internal boundary layer in a built environment [6].…”

Section: Introductionmentioning

confidence: 99%

“…Other factors includes the orientation of the buildings to each other, the rooftop layout, street canyons, and trees [7]. Wind profile in the inte rnal boundary laye r in a built e nvironme nt [6].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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“…Therefore, the performance of the CAWT increases with increase in skewed angle. Similarly, improvement in the performance of VAWT turbine due to skewed flow is reported in [6,33,56].…”

Section: Variation Of Height Above the Rooftopmentioning

confidence: 99%

Section: Variation Of Height Above the Rooftopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

et al. 2017

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A piezoelectric energy harvesting from the vibration of the airflow around a moving vehicle

2020

Int Trans Electr Energ Syst

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In this study, an energy harvester using the mechanical vibrations created by the airflow on piezoelectric transducers outside a vehicle was designed, produced and introduced. The introduced harvester has an energy production potential of μJ level. Given an energy power, very little power but long-term harvest was achieved. While the introduced vehicle was driven at speeds of 70, 90, and 110 km/h, energy production at location angles of 0 , 45 , and 90 was determined for each speed. Vehicle speed, location angle, airflow outside the vehicle, and harvester output were measured. Output voltage of the harvester was found to be directly proportional to vehicle speed. Output of the transducers was combined using a circuit topology that would maximize the output voltage. Thanks to this circuit highest output voltage was obtained from the location angle of 0. Thus, maximum output power was obtained at a speed of 110 km/h for 0 location angle. This research develops a new design method for efficient and practical energy generated by piezoelectric sensors placed on a vehicle from the vibration of the airflow around a moving vehicle. This energy harvester can meet the internal micro energy needs of the vehicle with an external battery.

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Performance evaluation of a downwind diffuser on vertical axis wind turbine

Wang

Wong

Chong

et al. 2021

Intl J of Energy Research

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Research has proven that the performance of a horizontal axis wind turbine (HAWTs) can be increased significantly by the application of a diffuser. It serves as a power augmented feature to draw higher wind flow toward the HAWT. However, research on integrating a diffuser onto vertical axis wind turbines (VAWTs) is scant, where most of the available power augmentation devices used for VAWTs are the convergent duct, deflector plate, shroud, and guide vanes which are placed in a proper configuration at the upwind. In this paper, laboratory tests and computational simulations have been carried out to study the impacts of a downwind diffuser on the performance of a VAWT. The diffuser is designed with the absence of a concentrator or flange and is placed downwind of the VAWT. Parametric computational fluid dynamics (CFD) studies were carried out for the downwind diffuser length and semi-opening angle. A five-bladed H-rotor was selected as the testing wind turbine, whereas the diffuser used was made up of flat plates. Both simulations and experiment results are consistent. From the experiments, it was found that a downwind diffuser increases the VAWT performance remarkably. The diffuseraugmented VAWT produced an increment in the maximum coefficient of power of 31.42% at the TSR 0.65 to 0.75. Moreover, the diffuser induced a better self-start ability on the VAWT. The simulation showed that the flow field at the diffuser promotes a flow expansion which created a lower-pressure region at downstream that accelerates the wind toward the VAWT, hence increasing the turbine performance significantly.

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Feasibility analysis of a Darrieus vertical-axis wind turbine installation in the rooftop of a building

Cited by 240 publications

References 11 publications

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

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

A piezoelectric energy harvesting from the vibration of the airflow around a moving vehicle

Performance evaluation of a downwind diffuser on vertical axis wind turbine

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