Effect of roof shape, wind direction, building height and urban configuration on the energy yield and positioning of roof mounted wind turbines

Abohela, Islam; Hamza, Neveen; Dudek, Steven

doi:10.1016/j.renene.2012.08.068

Cited by 217 publications

(127 citation statements)

References 19 publications

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“…Abohela et al [3] conducted CFD simulations for assessing the optimum seating positions of a small-scale roof mounted wind turbine on several roof profiles. The various roof profiles that were simulated included a flat, vaulted, domed, wedged, gabled and barrel.…”

Section: Previous Related Workmentioning

confidence: 99%

“…Both turbulence models are two-equation models in which the turbulence kinetic energy along with turbulence dissipation or the specific turbulence dissipation rate can be found. The first turbulence model was the realisable k-e which is the most commonly applied in building flow simulations [3]. In this turbulence model, the value (k) represents the turbulence kinetic energy available and the value (e) represents the turbulence dissipation.…”

Section: Cfd Setupmentioning

confidence: 99%

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Numerical investigation of the optimum wind turbine sitting for domestic flat roofs

Ishfaq

Chaudhry

2018

Sust. Build.

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Abstract. The power capacity of roof mounted wind turbines is dependent on several factors which influence its energy yield. In this paper, an investigation has been carried out using Computational Fluid Dynamics (CFD) to determine flow distribution and establish an optimum mounting location for a small wind turbine on a domestic flat roof. The realisable k-e and SST k-v turbulence models were compared to establish their consistency with one another with respect to the physical domain. Nine mounting locations were considered for a pole mounted wind turbine. Three windward positions on the upwind side of the flat surfaced building were considered as viable locations for mounting the small wind turbine. Out of the three windward locations, the central upwind (1,0) mounting position was seen to be producing the highest velocity of 5.3 m/s from the available ambient velocity which was 4 m/s. Therefore, this mounting location provided the highest extractable power for the wind turbine. Conclusively, wind properties along with the mounting locations can play a significant role in either enhancing or diminishing the small wind turbine's performance on a domestic flat roof.

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Section: Previous Related Workmentioning

confidence: 99%

Section: Cfd Setupmentioning

confidence: 99%

Numerical investigation of the optimum wind turbine sitting for domestic flat roofs

Ishfaq

Chaudhry

2018

Sust. Build.

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“…. In this article, we test the spherical roof shape proposed by Abohela [14], a squared-plant building with a half sphere on the roof. Figure 8 shows the difference between the curved roofs, both vaulted and spherical.…”

Section: State-of-the-art Roof Shapesmentioning

confidence: 99%

“…Shed roofs were also interesting, and a wind turbine could be installed on the top edge, because both high velocities and low turbulence intensities were present [11]. Abohela [14] demonstrated the interest in both vaulted and spherical roofs because of the lower turbulence and the speed-up factor. Although they are infrequently used, curved shapes present a clear advantage for wind energy exploitation.…”

Section: Introductionmentioning

confidence: 99%

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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“…In line with this, Abohela et al ( ) [6] conducted a study to identify a roof shape that encourages the best wind profiles. Comparing vaulted, domed, flat, gabled, pyramidal and wedged roofs for a range of wind directions, it was found that the vaulted roof showed the best results especially when flow was parallel to the roof from the side of the building along its curvature.…”

Section: Introductionmentioning

confidence: 96%

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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Effect of roof shape, wind direction, building height and urban configuration on the energy yield and positioning of roof mounted wind turbines

Cited by 217 publications

References 19 publications

Numerical investigation of the optimum wind turbine sitting for domestic flat roofs

Numerical investigation of the optimum wind turbine sitting for domestic flat roofs

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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