The Energy Yield of Roof Mounted Wind Turbines

Mertens, Sander

doi:10.1260/030952403773617472

Cited by 85 publications

(58 citation statements)

References 5 publications

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“…Mertens [4] examined the parameters that effected small-scale roof mounted wind turbines. Flow features of an urban landscape were inspected for applying a roof mounted wind turbine.…”

Section: Previous Related Workmentioning

confidence: 99%

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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“…Mertens [4] examined the parameters that effected small-scale roof mounted wind turbines. Flow features of an urban landscape were inspected for applying a roof mounted wind turbine.…”

Section: Previous Related Workmentioning

confidence: 99%

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

Ishfaq

Chaudhry

2018

Sust. Build.

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“…Dayan [27] suggested the mounting of wind turbines on top of high-rise buildings for a greater opportunity for wind energy generation in an urban area, and on buildings with special roof shapes [28]. The shape of buildings offers the possible benefits by augmentation of wind flow around buildings for wind energy generation as theoretically identified by Mertens [29]. Dutton et al [30] suggested that the locations of the acceleration effects over different roof shapes should be investigated in order to take advantage of the increased wind speed which translates into more energy yield.…”

Section: Building Integrated Wind Turbinesmentioning

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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“…To convert the wind atlas speed into a local reference speed, Mertens [9] suggests treating the edge of the urban area as a step change in roughness. Upwind of the urban boundary, the wind has a speed at height z A of U A (z A ), as given in the atlas, and a profile determined by a surface roughness length z 0A of 0.03m.…”

Section: Finding a Reference Wind Speed From The Wind Atlasmentioning

confidence: 99%

Estimating the potential yield of small building‐mounted wind turbines

2007

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The wind profile in the urban boundary layer is described as following a logarithmic curve above the mean building height and an exponential curve below it. By considering the urban landscape to be an array of cubes, a method is described for calculating the surface roughness length and displacement height of this profile. Firstly, a computational fluid dynamics (CFD) model employing a k‐ϵ turbulence model is used to simulate the flow around a cube. The results of this simulation are compared with wind tunnel measurements in order to validate the code. Then, the CFD model is used to simulate the wind flow around a simple pitched‐roof building, using a semi‐logarithmic inflow profile. An array of similar pitched‐roof houses is modelled using CFD to determine the flow characteristics within an urban area. Mean wind speeds at potential turbine mounting points are studied, and optimum mounting points are identified for different prevailing wind directions. A methodology is proposed for estimating the energy yield of a building‐mounted turbine from simple information such as wind atlas wind speed and building density. The energy yield of a small turbine on a hypothetical house in west London is estimated. The energy yield is shown to be very low, particularly if the turbine is mounted below rooftop height. It should be stressed that the complexity of modelling such urban environments using such a computational model has limitations and results can only be considered approximate, but nonetheless, gives an indication of expected yields within the built environment. Copyright © 2007 John Wiley & Sons, Ltd.

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The Energy Yield of Roof Mounted Wind Turbines

Cited by 85 publications

References 5 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

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

Estimating the potential yield of small building‐mounted wind turbines

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