US Patent 7323791 Louvered horizontal wind turbine

A wind turbine, including: a rotatable frame; a plurality of airfoils extending in a direction parallel to an axis of rotation of the rotatable frame; and an enclosure surrounding the rotatable frame, wherein the enclosure comprises a plurality of moveable members configured to direct air flow onto a first half of the rotatable frame and to block air flow onto a second half of the rotatable frame to thereby cause the rotatable frame to rotate. The moveable members may be pivotable louvers that can be opened by being oriented in a direction parallel to the direction of the air flow. By changing the orientation of the pivotable louvers, the present wind turbine can generate electricity from winds blowing in any direction.