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 building-integrated wind turbines involves a flow-enhancing architectural design for buildings to improve favourable inlet conditions to a DAWT.
Highlights
With depleting fossil fuel supplies, there is a growing need to address the replacement of our current energy production methods as much as possible
The exergetic performance of a Horizontal Axis Wind Turbines (HAWT) or a Vertical Axis Wind Turbines (VAWT) can be improved with the use of passive technology such as a Diffuser to form the Diffuser Augmented Wind Turbine (DAWT)
This paper aims to provide a state-of-the-art review of research and developed approaches to design integration and analysis of Diffuser Augmented Wind Turbines (DAWT’s) into the built environment
Summary
The exergetic performance of a HAWT or a VAWT can be improved with the use of passive technology such as a Diffuser (sometimes part of a shroud) to form the Diffuser Augmented Wind Turbine (DAWT) This aerodynamic device can ‘funnel’ incident air onto a rotor accelerating flow to achieve a greater power extraction for the turbine over a more controllable, continuous period of operation than is currently possible. The approach differs slightly compared to free standing DAWT’s because the presence of building(s) can significantly affect the inflow conditions to the diffuser and so this has to factored into the design
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