Abstract
AbstractThis study investigates power generation capacity of stator‐augmented PowerWindow, a linear cascade wind turbine, when installed in through‐building openings of a tall building. By employing a new approach, referred to as equivalent momentum sink method, the flow characteristics of the ducted flow, such as its pressure, velocity, and turbulence intensity are predicted when subjected to different wind directions in presence of a wind turbine. This study shows that a properly designed layout maintains the velocity in the through‐building openings for a wide range of wind directions and enhances the power generation by 50%‐80% in comparison with the free‐stream wind turbine installed at the same elevation. This study also compares the power generation of stator‐augmented PowerWindow with a conventional horizontal axis wind turbine, Ampair 300, installed in the same through‐building openings. The results show that the power generation of the ducted stator‐augmented PowerWindow is close to that of the ducted Ampair 300 in certain wind directions. However, it can also effectively generate power at those wind directions that the ducted Ampair 300 is unable to operate. The analysis shows that this advantage significantly increases the annual power generation probability of the building‐integrated stator‐augmented PowerWindow. As a case study, it is shown that by embedding four through‐building openings integrated with stator‐augmented PowerWindow in a tall building in Sydney area, a portion (0.55‐8.07 KW) of the electricity consumption of the building facilities can be supplied 72% of times.
Highlights
Installation of small wind turbines on buildings can potentially generate a part of the energy demand in cities.[1,2] One of the advantages of the application of wind turbines in urban environment is the power generation at the point of use, and the reduction of the energy loss and cost of power distribution network.[3]
Employing the equivalent momentum sink method, developed in this study, characteristics of the ducted flow is predicted in presence of stator-augmented PowerWindow, a linear cascade wind turbine (LCWT) and power generation capacity of the LCWT is investigated when it is installed in a through-building opening in a tall building
The equivalent momentum sink method enables the estimation of pressure, velocity, and turbulence intensity of the flow in the through-building opening integrated with a wind turbine and subjected to different wind directions
Summary
Installation of small wind turbines on buildings can potentially generate a part of the energy demand in cities.[1,2] One of the advantages of the application of wind turbines in urban environment is the power generation at the point of use, and the reduction of the energy loss and cost of power distribution network.[3]. (HAWT) have better performance in flat-terrain applications, whereas vertical axis wind turbines VAWT show superior performance in high-density building environments.[4] Flow characteristics in urban area are most often dominated by the boundary layer which is characterized by unsteady turbulent flow passing over buildings and structures. The boundary layer development in urban area is known to be the least well-developed. Wind turbines are generally operating in relatively low average wind speeds in urban areas.[5] Suitable locations in and around buildings currently being used for integrating wind turbine systems can be categorized into four groups: in between two buildings; inside a through-building opening; mounted on the roof; and integrated into the façade of a building
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