Earlier versions of this page described the Hanna Turbine, US utility patent 8,358,026. The Hanna device is both a wave and tidal energy converter. The full patent has now been assigned to a highly qualified tidal energy developer in the United Kingdom. Information on the patent's new owner can be found by searching the patent number at the US Patent Office web site. The following information describes another Hanna wave energy system for fighting the looming climate crisis.
THE HANNA MONO-RADIAL IN OWC CONFIGURATION
In-house Proof of Concept testing has been successfully completed for the mono-radial design by Oregon inventor John Clark Hanna. The new Radial Drive is a novel and exquisitely simple wave energy converter. From the exterior, the method of air intake appears to be self-evident. But inside the device, there is a proprietary method of directing the air. The full force of the incoming air flows are efficiently harnessed to increase rotational drive.
Unlike common OWC (Oscillating Water Column) impulse turbines, the new Hanna PTO is more like a water wheel or Pelton Wheel. It is a mono-radial, self-rectifying air wheel that does not use valves, sensors or solenoids to help the rotor turn in one direction. Annular collector vanes in the rotor's periphery help develop optimal momentum. Enhanced torque drives a special air-cored, axial flux generator that develops no magnetic resistance to the speed of rotation.
The Hanna Radial Drive is versatile. It can also operate within a sealed closed loop system. The closed loop system has a balanced air flow in both directions. Unlike the OWC application, the closed-loop version is never exposed to corrosive salt water mist and the resulting marine slime that coats internal parts. The closed loop system's output can be scaled and is ideal for subsurface, utility-scale buoys.
THE HANNA MONO-RADIAL IN CLOSED LOOP CONFIGURATION
When operated as an OWC-type converter, it makes more power due to a patent pending ‘air entrainment’ strategy which multiplies the volume of air intake. The strategy avoids energy losses that conventional OWC systems experience when a weak reverse air flow is sucked back in from the atmosphere. The patent pending drive can scale up from low-wattage to utility grade power outputs. The design will power shore-based installations, surface buoys and fully submerged point absorbers out of sight from the shore. The subsurface buoy's excitation force is caused by the fluctuating pressure differentials created by passing incident waves. To learn more about the proprietary subsurface buoy, contact John Hanna directly.
For information on another patented wave energy converter, a mechanical direct-drive PTO called the Hanna MultiDrive click HERE.