Urban wind energy exploitation systems: Behaviour under multidirectional flow conditions—Opportunities and challenges

Toja-Silva, Francisco; Colmenar‐Santos, Antonio; Castro-Gil, Manuel

doi:10.1016/j.rser.2013.03.052

Cited by 143 publications

(89 citation statements)

References 36 publications

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“…Toja-Silva et al (2013) present a review of the opportunities and challenges of urban wind energy that stresses the necessity to perform accurate analyses of the flow behaviour on building roofs, in order to get more information about possible positions of wind turbines to take advantage of the accelerating effect of the wind above the building, the adequate kind of turbine and the estimation of the power generation. Some authors (Ledo et al, 2011;Lu and Ip, 2009;Ricciardelli and Polimeno, 2006;Ng et al, 2011;Abohela et al, 2013) have carried out similar analyses reaching the same conclusions.…”

Section: Introductionmentioning

confidence: 99%

Roof region dependent wind potential assessment with different RANS turbulence models

Toja-Silva

Peralta

López-García

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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The analysis of the wind flow around buildings has a great interest from the point of view of the wind energy assessment, pollutant dispersion control, natural ventilation and pedestrians wind comfort and safety. Since LES turbulence models are computationally time consuming when applied to real geometries, RANS models are still widely used. However, RANS models are very sensitive to the chosen turbulence parametrisation and the results can vary according to the application. In this investigation, the simulation of the wind flow around an isolated building is performed using various types of RANS turbulence models in the open source code OpenFOAM, and the results are compared with benchmark experimental data. In order to confirm the numerical accuracy of the simulations, a grid dependency analysis is performed and the convergence index and rate are calculated. Hit rates are calculated for all the cases and the models that successfully pass a validation criterion are analysed at different regions of the building roof, and the most accurate RANS models for the modelling of the flow at each region are identified. The characteristics of the wind flow at each region are also analysed from the point of view of the wind energy generation, and the most adequate wind turbine model for the wind energy exploitation at each region of the building roof is chosen.

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Section: Introductionmentioning

confidence: 99%

Roof region dependent wind potential assessment with different RANS turbulence models

Toja-Silva

Peralta

López-García

et al. 2015

Journal of Wind Engineering and Industrial Aerodynamics

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“…The lower T I threshold is reached for the spherical roof, at z/H = 1.12. Below this T I threshold, vertical axis wind turbines (VAWT) may be considered due to their better behavior under skewed and highly turbulent flow conditions [3,6,42,43]. Figure 11d shows a comparison of the speed-up (U/U ref ) and the T I threshold height for the state-of-the-art cases at the roof positions described above.…”

Section: State-of-the-art Roof Shapesmentioning

confidence: 99%

“…One of the most significant aspects of this lack of societal acceptance is due to customers' disappointment regarding the difference between the expected and the real energy generated. This difference occurs because the performances of the wind turbines are calculated under ideal conditions in flat terrain, conditions very different from the real conditions in the urban environment [6]. Another important aspect for social acceptance is the visual impact [5], which can be avoided by considering the wind turbines during the architectural design process.…”

Section: Introductionmentioning

confidence: 99%

“…Toja-Silva et al [6] present a review of the opportunities and challenges of urban wind energy that stresses the necessity to perform accurate analyses of the flow behavior on building roofs, in order to get more information about possible positions of wind turbines to take advantage of the accelerating effect of the wind above the building, the adequate kind of turbine and the estimation of the power generation. Several authors [10][11][12] describe the influence of sharp building roof shapes on both the wind velocity and turbulence intensity from results obtained using computational fluid dynamics (CFD) simulations.…”

Section: Introductionmentioning

confidence: 99%

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On Roof Geometry for Urban Wind Energy Exploitation in High-Rise Buildings

et al. 2015

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The European program HORIZON2020 aims to have 20% of electricity produced by renewable sources. The building sector represents 40% of the European Union energy consumption. Reducing energy consumption in buildings is therefore a priority for energy efficiency. The present investigation explores the most adequate roof shapes compatible with the placement of different types of small wind energy generators on high-rise buildings for urban wind energy exploitation. The wind flow around traditional state-of-the-art roof shapes is considered. In addition, the influence of the roof edge on the wind flow on high-rise buildings is analyzed. These geometries are investigated, both qualitatively and quantitatively, and the turbulence intensity threshold for horizontal axis wind turbines is considered. The most adequate shapes for wind energy exploitation are identified, studying vertical profiles of velocity, turbulent kinetic energy and turbulence intensity. Curved shapes are the most interesting building roof shapes from the wind energy exploitation point of view, leading to the highest speed-up and the lowest turbulence intensity.

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“…[1]; Ishugah et al > ]; Toja-Silva et al [3]). As Nishimura et al > ] explains, understanding the building topologies and velocity profiles available for a given location is crucial.…”

Section: Introductionmentioning

confidence: 99%

State-of-the-art in development of diffuser augmented wind turbines (DAWT) for sustainable buildings

Agha

Chaudhry

2017

MATEC Web Conf.

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Abstract. In this paper, a review of the development of Diffuser Augmented Wind Turbines (DAWT's) into the Built Environment has been presented. DAWT's offer a lot of potential as electricity providers in areas where it is needed, such as in the built environment. Research into DAWT's has revealed that flow along a building significantly affects inlet conditions to the rotor due to flow separation at the leading edge. Adjusting the area ratio, length/diameter ratio as well as diffuser design can improve the performance of the free-standing DAWT significantly. Placing the turbine at the centre of a roof is found to allow the best wind conditions to the wind turbine. It was found that a turbine can be placed at a height 1.3 times the height of a small building for the best results. It has been found that vaulted roof's encourage acceleration of air flow better than other topologies. Furthermore, a recent approach to buildingintegrated wind turbines involves a flow-enhancing architectural design for buildings to improve favourable inlet conditions to a DAWT.

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Urban wind energy exploitation systems: Behaviour under multidirectional flow conditions—Opportunities and challenges

Cited by 143 publications

References 36 publications

Roof region dependent wind potential assessment with different RANS turbulence models

Roof region dependent wind potential assessment with different RANS turbulence models

On Roof Geometry for Urban Wind Energy Exploitation in High-Rise Buildings

State-of-the-art in development of diffuser augmented wind turbines (DAWT) for sustainable buildings

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