New Patents and Know-How of  Wind Turbines for Low Cost Power Generation

The final aim of the presented here new developments of wind turbines are to decrease both initial investments and maintained costs by environment friendly technical solutions.

There are multiple ways to tap the energy of the wind. But off shore winds appears to be the most competitive solutions. But for on shore distributed power generation new invented jet augmented wind generators are the best economical feasible solution of both stand alone and grid tied applications.

For every economical feasible wind farm is important the initial investment. Low initial investment means competitive cost of power generated by wind farms.

Basic types of wind turbines

A wide variety of types and sizes of wind machines exist today. We are using here a classification by the overall degree of load of the different types of wind turbines during an yearly cycle. The top position of the classification shows both minimal investment and maintenance cost -   the best economical feasible solution.

Usually, wind turbines are classified by mode of operation (drag and lift mode of operation):

• On a drag device the wind pushes the blade forcing the rotor to turn about its axis; the most common example of a drag device is the horizontal axis wind turbines (HAWT) for water pumping in farms and vertical axis (VA) drag turbines. Drag devices characteristically produce high starting torque, but they are limited in the amount of energy they can extract from the wind. Drag devices both horizontal and vertical axis of rotation operate at low velocity flow and high speed flow, as well.

• Lift HAWT  have only a few (two, three) blades in contrast to the multiple blades of a HA drag devices. One blade rotating very fast can extract as much energy as many blades rotating slower. Lift devices use slender airfoils for blades, whose shape is the same as an airplane wing. Lift devices are  more efficient than the drag devices, thus the blade area can be reduced considerably. But lift devices not operate in low velocity wind. Lift devices are the best efficient solution of both offshore and onshore applications but they are expensive and complicated machines with high initial investment and high operation costs. They are killing birds.
  

• The third mode of  wind turbine operation is the JET mode of operation. It is a radical new solution. All my inventions relate to the hydro and wind JET turbine applications take advantages of an additional JET force augmented blade rotation.  Thanks to it the turbine efficiency is increased up to 2 times for both lift and drag devices on the vertical, inclined and horizontal axis hydro / wind rotors of axial and cross flow rotors. All JET augmented turbines are self starting machines at very low flow stream.

Below is  presented a comparison of the initial investments of the wind turbines classifying by above described modes of operation:

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Inventions & Technologies of Renewable Energy

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