Assessments regarding the performances of wind turbines from the roofs of buildings (original) (raw)
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The Energy Yield of Roof Mounted Wind Turbines
Wind Engineering, 2003
The roof is a possible site for small wind turbines. This is a new but more and more accepted idea. Several Dutch companies in close cooperation with the Section Wind Energy of Delft University of Technology are busy with the design of small roof wind turbines at the moment. The important flow features for a wind turbine on the roof however are unknown. The common wind engineering knowledge is only focussed on extreme wind speeds in order to have a safe building. So, models to calculate the flow features on the roof, important for a wind turbine, have to be developed. This paper gives a first attempt to describe the flow features and guidelines necessary for siting of small wind turbines on the roof. They concern: the desirable height above the roof, the change of the undisturbed wind to the wind speed above the roof and the probability distribution of the wind speed above the roof. With use of the guidelines three example calculations are given to assist the reader in the calculati...
The Study of the Savonius Wind Turbine Blade Performance Integrated on the Doom Roof Type Building
International Journal of Emerging Trends in Engineering Research, 2020
The wind turbine, a high potential renewable energy that available install directly in the location of energy demand.it can reduce energy loss due to the transmission. Installation of the wind turbine integrated with a building has a significant problem due to the efficiency and noise. In the urban area, the high building and particular roof design can be amplified the wind speed. In present research aim to investigate Savonius wind turbine with addition slotted blade, that suitable integrated with the doom roof type building. The research was conducted by an experiment method in an open type wind tunnel, and the best variable of the experiment becomes the input of Computational Fluid Dynamic (CFD) simulation, the Savonius wind turbine integrated on the doom roof type. The experimental variables are slotted angle blade 5°, 10°, and 15° degree, and wind speeds are arranged 3 m/s to 9 m/s. The validation of simulation is observed by comparing with the experimental result. In the simulation, the ratio of the doom geometry is a comparison between diameter to the high of the doom. The doom ratios is 1.5, and the position installation is on the top of the doom. The result found that the highest power coefficient is achieved to 0.291 and the torque coefficient to 0.776 by the 6m/s of wind speed. The slotted angle blade of 5° obtained as the optimum configuration in a low tip speed ratio. The 1.5 doom roof ratio is considered the highest performance of CFD in both of the top and side installation. This experiment result can become a reference to implemented the installation on the doom roof type such as mosque in urban areas with low wind speed
Renewable Energy, 2013
The increasing interest among architects and planners in designing environmentally friendly buildings has led to a desire to explore and integrate renewable sources of energy. Roof mounted wind turbines is a technology that presents a high potential for integration within the built environment. However, there is a state of uncertainty regarding the feasibility of these wind turbines. This paper argues that part of this uncertainty is attributed to uninformed decisions about positioning and locating urban wind turbines. This is underpinned by lack of consideration to the accelerating effect of different roof shapes, buildings' heights and surrounding urban configurations. This paper aims to present the results of Computational Fluid Dynamics (CFD) simulations for the purpose of identifying the effect of different roof shapes on the energy yield and positioning of roof mounted wind turbines covering different buildings' heights within different urban configurations under different wind directions. Results from this investigation suggest that an increase in energy yield could be achieved which can reach 56.1% more electricity in the case of a vaulted roof if an informed wind assessment above buildings' roofs is carried out.
Study on Wind Turbine and Its Aerodynamic Performance
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This paper aims to present the Study on wind turbine and its aerodynamic performance. Rapid increase in global energy requirements has resulted in considerable attention towards energy generation from the renewable energy sources. In order to meet renewable energy targets, harnessing energy from all available resources including those from urban environment is required. This paper represents the study of wind turbine. There are two type of wind turbine Vertical axis wind turbine and Horizontal axis wind turbine that had been discussed on this paper. Vertical Axis Wind Turbines (VAWTs) are seen as a potential way of utilizing urban energy sources. Most of the research on the wind turbines constitutes condition monitoring and performance optimization of VAWTs under a constant velocity of air where the transient effects have not been accounted. The inconsistent behavior of the wind may change the nature of the flow field around the VAWT which could decrease its life cycle. This study i...
Wind power potential assessment of roof mounted wind turbines in cities
Sustainable Cities and Society, 2019
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Contemporary Materials, 2015
Given the environmental and energy saving effect of the use of small wind turbines in urban environments, scientists, architects, manufacturers, investors and government institutions have joined forces for more extensive studies. The paper deals with research work of the optimized design of Darrieus turbine with 1 kW rated power in a particular climate. For purposes of the study a universal algorithm implemented with code in C++ has been developed. Thus it is possible to determine the turbine power developed and its efficiency in climate change factors air temperature, speed and intensity of the wind. The monitoring data cover a period of six months (a total of 18 533 measurements) for specific climatic region.
Small Vertical Axis Wind Turbines for Energy Efficiency of Buildings
Journal of Clean Energy Technologies, 2015
The integration of renewable resources in buildings is a fundamental aspect of the 21st-century architecture in order to achieve zero energy buildings (ZEB), reduce the consumption of fossil energy and cut carbon emissions in urban areas. Besides photovoltaic systems, nowadays Vertical Axis Wind Turbines, whose business is growing globally, are becoming particularly interesting because of the potential to produce energy and to be building integrated. These small wind generators (200 W-10kW) can be used as stand-alone systems or as grid connected systems, and both can be paired with other energy conversion systems, such as photovoltaics. With a height from 2 to 10 meters, small wind turbines can be placed on rooftops, on streets or in gardens, they have relatively little visual impact and are able to produce energy even from modest wind flows. In addition to that, small wind turbines may also be coupled to street lighting systems (smart lighting). The article presents an analysis of the different types of vertical wind turbines available on the market, including investigational products, and illustrates how it is possible to install them on buildings (Building Augmented Wind Turbines) and the benefits achieved in terms of energy production compared to photovoltaic systems. Index Terms-Energy efficiency of buildings, renewable energy, small wind turbines, building integrated wind turbines, building augmented wind turbines, vertical axis wind turbines.
Comparative Performance Analysis of Small Scale Wind Turbines
Journal of Engineering Science and Technology Review, 2012
Expectations towards small scale urban wind based electricity generation are rather high. The vendors promise high production rates and high returns on the investment. In this paper we describe our practical measurement experiment of one horizontal and three vertical axis turbines. The result shows that the performance of the turbines does not meet the expectations and the urban wind blow is really far from being optimal in energy production.