The shrouded turbine Race Rocks Tidal Current Generator before installation at Race Rocks in southern British Columbia in 2006. It operates bi-directionally and has proven to be efficient in contributing to the integrated power system of the area.[1]
The shrouded tidal turbine is an emerging tidal stream technology that has a turbine enclosed in a venturi shaped shroud or duct (ventuduct), producing a sub atmosphere of low pressure behind the turbine. The venturi shrouded turbine is not subject to the Betz limit and allows the turbine to operate at higher efficiencies than the turbine alone by increasing the volume of the flow over the turbine. Claimed improvements vary, from 1.15 to 4 times higher power output [2] than the same turbine minus the shroud. The Betz limit of 59.3% conversion efficiency for a turbine in an open flow still applies, but is applied to the much larger shroud cross-section rather than the small turbine cross-section.
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"The Race Rocks Tidal Energy Project". Clean Current Power Systems Incorporated. Archived from the original on 2008-07-05. Retrieved 2008-07-09.
^"Brian Kirke's published article Developments in Ducted Water Turbines" (PDF). Archived from the original (PDF) on 2012-09-13. Retrieved 2013-04-28.
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