Inventor, John Clark Hanna, introduces three wave energy converters for utility-grade power: (1) the Hanna Turbine known as a WETGEN (Wave Energy Turbine GENerator), U.S. Patent No. 8,358,026, (2) the Hanna MultiDrive, a mechanical, direct-drive power take-off (PTO), U.S. Patent No. 8,745,981 and (3) a mono-radial impulse turbine PTO.
All three devices harvest energy from ocean waves by means of the OWC (Oscillating Water Column) principle. OWC technologies are the most mature and well-studied wave conversion systems in the industry. Oregon State University (OSU) built a small working Hanna Turbine. The device was tested with a bi-directional air flow. Acting as an impartial third-party, the OSU College of Engineering issued a final report that validated the Hanna Turbine in 2014.
The simple and robust Hanna Turbine was designed to improve upon the pioneering Wells Turbine. In contrast to the thirty year old Wells design, the transformative Hanna Turbine uses asymmetrical airfoils with a lower angle of attack. This creates more lift and less drag. The design resists "stall", improves self-starting and can function over a wider bandwidth with higher torque values. It offers lower damping (restriction) to the bi-directional airstream. Unlike the Wells, it drives two generators - doubling the power output. Both generators are easily accessable and operate in a dry environment. The Hanna Turbine is versatile, offering three distinct power take-off designs to meet job-specific applications.
The turbine and direct-drive devices operate at sea or on shore. They can be built into existing or purpose-built jetties or breakwaters and can be easily connected to the grid. All completed EIR studies for existing shore based OWC installations have resulted in FONSI (Findings of no Significant Impact). Hanna shore based power plants will not interfere with marine life, maritime traffic, commercial fishing or recreational activities. The buoys can be easily serviced through weather-tight hatches. No generating components are immersed in water.
To underscore the remarkable versatility of the WETGEN design, the turbine can be easily modified for use as a tidal energy converter. Whether applied for wave energy or tidal energy, no other turbine in the global marketplace can serve both of these renewable energy sectors.
In February 2019, a new US provisional patent 62/918,741 was granted to John Hanna titled: "Improved Volumetric Air Flows For Oscillating Water Column Turbines". The invention provides a multi-fold increase in the volume of air that is drawn through OWC turbines. The method greatly improves the efficiency and power output for all types of OWC turbines.
For an overview of both the Hanna AIR and TIDAL Turbines and to read two Master's degree Engineering Reports, click HERE.