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Rooftop turbines aim to capture power in windy cities

http://www.cbc.ca/news/science/what-on-earth-wind-turbines-cities-1.6710512

Publisher:  CBC News
Date Written:  12/01/2023
Year Published:  2023  
Resource Type:  Article

The design of traditional wind turbines doesn't really work in cities, where densely packed buildings tend to black and redirect wind, making it gusty and variable in speed and direction. However, new designs of wind turbines that allow for urban use have the potential to change the ways cities use energy.

Abstract: 
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Extract:

Flower Turbines, based in New York City, creates vertical wind turbines that look like large, skinny tulips (see gif above). They're designed to be installed on the ground or on a flat roof. The vertical-axis turbines can start generating power at low wind speeds of just 0.7 metres per second, compared to 3.5 m/s (or 12.6 km/h) for traditional wind turbines. The company sells one- and three-metre-high models in the U.S and Europe.

PowerNEST (see gif below), made by IBIS Power in Eindhoven, the Netherlands, is a rooftop unit that integrates wind and solar in what the company describes as a "flowing kinetic sculpture." It uses fins on the edges of the rectangular frame to direct air to vertical turbines that sit underneath a roof of solar panels. The wind helps cool the panels and increase their efficiency. The company says the system can capture six to 10 times more electricity than rooftop solar panels alone. So far, the company has created a handful of demonstration projects in the Netherlands.

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