High efficiency turbine system

A turbine system comprising:

• a shroud;
• a propeller located inside the shroud and having an axis of rotation;
• and
• an asymmetrical projection continuously protruding from a perimeter of the shroud and substantially perpendicular to the axis of rotation of the propeller, wherein the asymmetrical projection includes a plurality of asymmetrical brim groups, each of the plurality of asymmetrical brim groups including a first asymmetrical brim unit and a second asymmetrical brim unit adjacent the first asymmetrical brim unit.

A renewable energy system comprising:

• a shroud;
• a propeller located inside the shroud and having an axis of rotation;
• and
• an asymmetrical projection continuously protruding from a perimeter of the shroud and substantially perpendicular to the axis of rotation of the propeller, wherein the asymmetrical projection includes a plurality of asymmetrical brim groups formed in a repeating pattern, each of the plurality of asymmetrical brim groups including a first asymmetrical brim unit and a second asymmetrical brim unit adjacent the first asymmetrical brim unit.