ZA200902887B - A vertical axis boosted air wind and solar turbine to generate electricity - Google Patents

Description

TITLE OF INVENTION: AIR TURBINE | | | | | I | | | I

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INTRODUCTION

This invention relates to an air turbine. More particularly, this invention relates to an air turbine with a vertically mounted rotor for generating electric energy by air flow which is provided by a plurality of air blowers. :

BACKGROUND OF THE INVENTION

With the ever increasing costs for fossil fuels over the past, renewable energy sources are nowadays in the focus of research and are increasingly utilised in energy generating units all over the world. Among the different types of renewable energy sources, wind energy is a prominent example. In order to make use of wind energy, several concepts are known in the art. For example, wind turbines having a shaft oriented along a horizontal axis for carrying the rotor are employed. Other concepts include vertically mounted wind turbines, for example of the Savonius type.

However, several drawbacks are associated to the above mentioned prior art devices.

For example, most of the horizontally and vertically mounted devices are susceptible to wind turbulences. As such, most of the known horizontally mounted devices are swept out of the air stream into a parking position once impinging wind gusts are above a certain level. Furthermore, once the air stream ceases, known devices do not produce useful electric energy anymore. Consequently, in either high or very low wind conditions no electric energy is produced by these devices which leads to a delivery of electric energy in a non-continues mode only.

OBJECTS OF THE INVENTION

It is an object of the present invention to provide an air turbine which overcomes, at least partly, the disadvantages associated with the state of the art air turbines. . - . . . a v

It is also an object of the present invention to provide a new air turbine involving an inventive step. la

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SUMMARY OF THE INVENTION

According to a first aspect of the present invention, there is provided an air turbine device for generating electric energy comprising a vertically mounted rotor with a plurality of airfoils, the airfoils being partially enclosed by a circumferential airfoil shrouding having a plurality of port holes on the outer circumference, a plurality of air blowers being located on the outer periphery of the airfoil shrouding, and a plurality of air ducts being respectively arranged between at least one air blower and a port hole, the air ducts being capabie of blowing air from the air blower into the air duct in an align air stream manner so as to align air flow in the duct to an air stream flow that circulates in the airfoil shrouding and to turn the air turbine by driving the airfoil in a circular direction.

When used in this specication for the various embodiments, the expression “vertically mounted rotor” means a rotating part of a turbine with a drive shaft being substantially vertical with respect to a foundation on which the rotor is mounted. However, an inclined mounted rotor may also fall under the scope of the term vertically mounted.

When used in this specification for the various embodiments, the expression “airfoil” means a wing type structure which can be moved upon an impinging air stream. lt can further be understood that in normal course of usage an airfoil provides a buoyant force, although in some embodiments and/or implementations this is not necessarily the case.

Accordingly, the term airfoil may also include a non-lifting structure.

When used in this specification for the various embodiments, the expression “airfoil shrouding” means partially covering of an airfoil that is situated on an airfoil blade. It can further be understood that in normal course of usage several port holes are present.

Furthermore, the shrouding leaves a slit like opening so as to allow the airfoil to move within the airfoil shrouding in a circular manner. Accordingly, airfoil shrouding does not necessarily mean that the airfoil is fully covered, sealed or enclosed.

According to an embodiment of the present invention, the air turbine device may further comprise at least one wind turbine, the wind turbine having a drive shaft being connected to at least one of said air blowers,

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The drive shaft of the wind turbine may be connected to the at least one air blower by a clutch.

Alternatively or additionally, the drive shaft of the wind turbine may be connected to the at least one air blower by a gear box.

Alternatively or additionally, the drive shaft of the wind turbine may be connected to the at least one air blower by a pulley.

In one embodiment, a group of air blowers may be connected to one air duct so as to multiply air flow and boost a higher air velocity into the air duct. The group of air blowers may comprise at least three air blowers.

At least one of the air blowers of the group of air blowers may be driven by an electric motor. It is to be appreciated that the electric motor may sustain and boost air flow power in the air duct when wind energy is low.

The electric motor may be powered by a renewable energy source. The renewable energy source may include a solar electric power grid, a water wave electric power grid or a biomass electric power grid. The electric motor may be powered by a further electric wind turbine. The electric motor may be powered by an electric storing device.

The airfoil shrouding may cover the airfoil ranging from the airfoil bottom side to the airfoil top side. Preferably, the airfoil shrouding may cover the airfoil by covering more than 320 degrees around the airfoil.

The airfoil shrouding may cover the air turbine airfoil 360 degrees in circumference.

It is to be appreciated that the airfoil shrouding may serve as a wind break with wind flowing over and past the rotor of the air turbine. i

The air flow in at least one of the plurality of air ducts 1s restricted so as to promote a higher velocity air flow in the air turbine.

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The at least one of the plurality of air ducts may comprise a wider inflow air section that tapers to a narrower outflow section.

The at least one of the plurality of air ducts may further comprise a remote controlled device at the narrow section of the air duct capable of narrowing or widening the air outlet section of the duct. The remote controlled device may comprise a valve.

It is to be appreciated that a higher velocity air flow in the air turbine ducting by restricting the air flow in the duct can be promoted. If air is restricted in a confinement, it flows faster.

The airfoil shrouding of the air turbine may comprise air outflow port holes being connected into an outflow air duct.

The outflow air duct may divert air flow into an inlet air section of at least part of the air blowers so as to let the air blower continue an air flow circulation cycle.

The out flow air duct may be aligned to let air fiow in an in stream free fiow.

A free air inflow port hole at the connection of the air blower and the air outflow duct may be capable of balancing the suction air of the air blower and air pressure in the outflow duct.

The airfoil blades may be covered on top and sides in the full circumference of the air turbine to form multiple compartments.

The airfoil compartments may be capable of containing an up draught air pressure to float upward and in a circular air stream direction in the airfoil shrouding of the air turbine.

The air flow pressure may be directed onto the airfoils of the air turbine through the air porting holes in the airfoil shrouding.

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The air ducts may be arranged at an angle onto the air porting holes of the airfoil ; shrouding so as to produce an ai flow pressure in a forward thrust on the air turbine airfoil blades and at an angle to produce an up thrust on the airfoil blade cover of the air turbine rotor.

The air turbine device may further comprise aerostat compartments being fitted in the circumference of the rotor.

Alternatively or additionally, the air turbine device may further comprise aerostat compartments being fitted onto the rotor.

The aerostat compartments may be mounted with belts and/or bolts

The aerostat compartments may be stationary covers covering top and bottom, the stationary cover is fitted in the circumference of the air turbine and is fixed onto the airfoil shrouding.

The vertically mounted rotor of the air turbine may have a diameter of at feast 10 m, preferably 60 m or larger.

The vertically mounted rotor may comprise at least three airfoil blades.

The at least one wind turbine may be arranged as a multi unit vertical wind turbine being arranged at least 10 m above ground, preferably at 30 m or 45 m above ground, or even higher. The at least one wind turbine may be arranged as a multi unit vertical wind turbine being arranged at least 10 m above and below air turbine rotor.

Wind turbines towers may be placed at many inner and outer circumference rows of the air turbine device. The wind turbine inner and outer tower rows may have different alternate heights. The wind turbine units may have specific spaces in between to allocate for wind to flow through free across the air turbine. The wind turbine towers top ends may be braced together in circumference to secure towers in storm weather.

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According to a second aspect of the present invention, there is provided a method to multiply air flow and boost a higher air velocity into an air duct by providing an air turbine device.

According to a third aspect of the present invention, there is provided a method to sustain and boost air flow power in an air duct when wind energy is low by providing an air turbine device.

According to a fourth aspect of the present invention, there is provided a method to multiply air flow and boost a higher air velocity into an air duct by providing an air turbine device.

According to a fifth aspect of the present invention, there is provided a method to cover a vertical axis air turbine from crosswind turbulence and to contain a permanent circular in stream air flow in an enshrouded circuiar tunnel by providing an air turbine device.

According to a sixth aspect of the present invention, there is provided a method to apply multiple forces of air simultaneously on a plurality of airfoil blades of an air turbine airfoil to force and turn the air turbine rotor in a circular direction by providing an air turbine device.

Additionally this can further comprise to maintain that the multiple forces of air reacts as one larger force on the air turbine rotor.

According to a seventh aspect of the present invention, there is provided a method to produce up draught air pressure lift on the full circumference airfoil of a vertical axis air turbine to relieve the bearing weight of the turning air turbine rotor airfoil shrouding by providing an air turbine device.

According to an eighth aspect of the present invention, there is provided a method to induce a continuous air flow circulation in the air turbine air power system and to reduce air suction strain on the air blower rotor and promote a higher air capacity flow and a higher air velocity circulation cycle by providing an air turbine device.

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According to a ninth aspect of the present invention, there is provided a method to alleviate the rotor weight drag of a vertical axis air turbine and to promote lift by providing an air turbine device.

DETAILED DESCRIPTION OF THE INVENTION

The invention will now be described, by way of non-limiting example and drawings. The different embodiments of the invention are now further illustrated with reference to the following drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 schematically shows a top view of an air turbine device according to an embodiment of the present invention;

Figure 2 shows a side view of an air turbine device according to an embodiment of the present invention;

Figure 3 shows a three-dimensional view of an air blower in an air turbine device according to an embodiment of the present invention;

Figure 4 shows a sectional view of an air blower in an air turbine device according to an embodiment of the present invention;

Figure 5 schematically shows air flow through an air turbine device according to an embodiment of the present invention in a top view; and

Figure 6 shows a cross sectional side view of an air turbine device according to an embodiment of the present invention.

In all drawings, like reference numerals refer to like parts, unless otherwise indicated. ’

Making now reference to figure 1, an embodiment of the invention is described. Figure 1 schematically shows a top view of an air turbine device 10.

The air turbine device 10 is capable of generating electric energy. For this purpose, the air turbine device 10 includes a vertically mounted rotor 12. The vertically mounted rotor 12 can include several blades 14 which are formed as airfoils 16 at their outer edge. In the embodiment shown in figure 1, the vertically mounted rotor 12 includes three rotor blades 14. It is, however, also conceivable that the vertically mounted rotor has a different number of blades, for example four or more. The vertically mounted rotor 12 of the air turbine 10 has a diameter of at least 10 metres. Preferably, the diameter of the vertically mounted rotor 12 is 60 metre or even larger. The vertically mounted rotor 12 is fixed to a generator shaft 18 which is located in the centre of the vertically mounted rotor 12. The generator shaft 18 can drive a suitable generator in order to produce electric energy when the vertically mounted rotor 12 is rotating.

As indicated in figure 1, the airfoils 16 are partially enclosed by a circumferential airfoil shrouding 20 which covers the outer circumference of rotor 12. In a radial inward direction, the airfoil shrouding has an opening so as to let the airfoil 16 engage into the airfoil shrouding 20. In a radial outward direction, the airfoil shrouding 20 includes several port holes 22. In the embodiment depicted in figure 1, ten port holes 22 are provided along the outer circumference of airfoil shrouding 20. It should, however, be understood that the number of port holes 22 is only chosen as an example and can vary depending on specific configurations of the air turbine device 10.

Each of the port holes 22 is connected to an air duct 24. Each air duct 24 is connected to a plurality of air blowers 30. In the embodiment of figure 1, each air duct 24 is connected to three air blowers 30. The air ducts 24 are capable of guiding air from the air blowers through the air duct 24 in an aligned air stream manner into the airfoil shrouding 20.

Accordingly, an air stream flow that circulates in the airfoil shrouding 20 is generates which turns the air turbine 10 by driving the airfoil 16 in a circular direction. By connecting a generator or the like to the shaft 18, electric energy can be generated.

As shown in figure 1, two of the three air blowers 30 are connected to a wind turbine 40, which is located in close proximity to the respective air blowers. The wind turbine 40 drives the associated air blower 30 and thus allows the air blower 30 to blow air into the airfoil shrouding 20 via the air duct 24. For this purpose, the wind turbine 40 has a drive shaft which is connected to the air blower 30. It is also conceivable that the drive shaft of the wind turbine 40 is connected to the air blower 30 via a clutch. In addition, or alternatively, a gearbox of a pulley can be foreseen. Consequently, the group of air blowers 30 is connected to its respective air duct 24 in a way that it is possible to multiply air flow and boost a higher air velocity into the air duct 24.

According to the embodiment of figure 1, at least one of the air blowers 30 of the group of air blowers is driven by an electric motor (not explicitly shown in figure 1). Accordingly, it is possible to sustain and to boost airflow power in the air duct 24, even when wind flow is low.

The electric motor, which is connected to a respective air blower 30, can be powered by a renewable energy source. The renewable energy source can be, for example, a solar electric power grid, a water wave electric power grid or a biomass electric power grid. It is, however, also conceivable that the electric motor is powered by a further wind turbine. In another embodiment the electric motor is powered by an electric storing device such as a battery or the like.

As outlined above the airfoil shrouding 20 is covering airfoil 16. More specifically, the airfoil shrouding 20 covers airfoil 16 in a region from the bottom side to the top side of the wind along the outer circumference. Preferably, the airfoil shrouding 20 covers the airfoil 16 by covering more than 320 degrees around the air foil 16. In addition, the airfoil shrouding 20 covers the air turbine airfoil 360 degree in circumference. Accordingly, the airfoil shrouding 20 does not only act as a tunnel to guide the air flow in circular direction, but also acts as a wind break with wind blowing over and past the rotor 12 of the air turbine 10. This is in particular useful to cover the vertical axis of the air turbine 10 from cross-wind turbulence and to sustain a permanent circular airflow in the enshrouded circular tunnel. Consequently, the air turbine 10 can even be used in high wind conditions or during gusty winds.

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The air ducts 24 can be designed in a way that the air flow is restricted when passing through the air duct 24. Accordingly, a higher velocity air flow in the air turbine 10 is promoted, as a restricted air flow leads to higher air velocities. This can be achieved by providing the air ducts 24 with a wider inflow air section that tapers to a narrower outflow section. It is also conceivable that the air ducts 24 include a remote controlled device at the narrower section of the air duct 24, which is capable of narrowing or widening the air outlet section of that air duct 24. As an example, the remote controlled device can be a valve as schematically indicated by reference numeral 26 in figure 1.

Air should flow into the air turbine airfoil shrouding 20 through multiple air port holes 22 made in the circumference of the air turbine airfoil shrouding 20. The air port holes 22 centres, in the circumference of the air turbine airfoil shrouding 20 should be made to align with the centres of the air turbine airfoils 16.

The rotor blades 16 have hang braces from the centre top. As indicated by a circle 21 in between the blades the blades can be tie braced.

Making now reference to figure 2, a side view of the air turbine device 10 is shown. In figure 2 a plurality of wind turbines 40 are depicted being arrange above ground 42. The plurality of wind turbines 40 can be arranged as multi unit vertical wind turbines. As depicted in figure 2, three vertical axis wind turbines 40’, 40” and 40” form one wind turbine 40. Each unit 40’, 40” and 40™ of the wind turbines 40 can have a height of 5 metres for example. Consequently, the wind turbines which are arranged on the upper side of the air turbine 10 cover a height between 30 and 45 metres. The wind turbines arranged below cover a height between 45 and 60 metres.

The whole arrangement of wind turbines 40 can span over an area having a lateral dimension of 150 metres for example. Above ground 42, drive shafts 44 and gearing mechanisms 46 are indicated as well. The wind turbines towers are placed at many inner and outer circumference rows of the air turbine device. The wind turbine inner and outer tower rows have different alternate heights. The wind turbine units have specific spaces in between to allocate for wind to flow through free across the air turbine. The : wind turbine towers top ends are braced together in circumference to secure towers in storm weather as schematically indicated by reference numeral 48.

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Making now reference to figure 3, an air blower housing is shown. The air blower housing 1s in particular useful for a radial air blower which will be explained below. The air blower housing 50 has an air inlet 52 on its top side. The air blower includes a base plate 54 for a fan. Schematically, one blade is indicated by reference numeral 56 as a hatched line. The air blower outlet 58 is arranged at the outer surface of the air blower housing 50. The air blower is a versatile unit.

Making now reference to figure 4, a cross-sectional view through the air blower housing of figure 4 is shown. The air blower housing can have a diameter of four metres for example. The air blower housing 50 includes a first bearing 62 which is arranged on the base plate 54 of the air blower housing 50. A second bearing 64 is arranged above the first bearing 62. A drive shaft 66 is located between the two bearings 62 and 64 and below the first bearing 62. The drive shaft 66 is driven by the wind turbine or the electric motor as explained above.

Several fan blades 56 are connected to the drive shaft 66. Fan blades 56 may have a polygonal shape with a triangular cut out 68 close to the upper part of the drive shaft 66.

This is in particular useful in order to suck air via the air inlet 52 through cut out 68. The blade can have a height of 1.5 metre for example.

Making now reference to figure 5, airflow through the air turbine 10 is explained in more detail. In addition to the port holes 22, which are connected to the air ducts as\explained above, the airfoil shrouding 20 can have a plurality of air outflow port holes. Respective ones of the air outflow port holes are connected to a bottom outflow air duct 72 and a top outflow air duct 74.

The top outflow air duct 72 diverts air from the rotor downstream. The top outflow air duct 74 diverts airflow into an inlet air section 76 of the air blowers so that a continuous flow circulation cycle can be achieved. The bottom outflow air duct 74 is aligned to let air flow in a free flow into the air blower. It is also conceivable that a free air inflow port hole at the connection of the air blower and the air outflow duct is capable of balancing the suction air of the air blower and air pressure in the outflow ducts.

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Making now reference to figure 6, a further embodiment of the invention is depicted.

Figure 6 shows blades 16 of the air turbine 10 having airfoils being hemispherical shaped as indicated by reference numeral 80. More specifically, airfoil lift 80 is located close to the tip of blade 16. The blade 16 is further supporter by a wheel 82 which rests upon a landing pad 84. Airfoil lift 80 can have a diameter of 5 metre and a height of 2.5 metre. Airfoil lift 80 is further covered by airfoil shrouding 20, as already explained above.

According to a further embodiment up draught air pressure lift is produced on the full circumference airfoil of a vertical axis air turbine to relieve the bearing weight of the turning air turbine rotor. The airfoil compartments can contain an up draught air pressure to float upward and in a circular air stream direclion in the air turbine enshrouding. The air flow pressure is directed onto the airfoils of the air turbine through the air porting holes in the enshrouding. The air ducts is set at angle connected onto the enshrouding air porting holes. The air duct is set at an angle to produce an air flow pressure in a forward thrust on the air turbine airfoil blades and at an angle to produce an up thrust on the airfoil blade cover of the air turbine rotor. Airflow through bottom outflow air duct 74 is schematically indicated as an arrow with reference numeral 74 in figure 6.

In a further embodiment it is also conceivable to produce a buoyant aerodynamic lift on the air turbine 10, which eliminates surface contact drag and minimises weight drag of airfoils 16 on the bearing structure of the air turbine. This includes providing a float support to the full rotating turbine airfoil weight or part of the full rotating turbine airfoil weight and float support specific sections of the air turbine 10. Accordingly, inflated aerostats are installed which are lighter than air gas bags.

These structures are fitted in a specific manner to the wind turbine 10 including separate aerostat gas bag structures around the wind turbine circumference and around the wind turbine 10 radius sections. In another implementation, a full circular aerostat can be installed around the wind turbine 10. Furthermore, it is conceivable to install the aerostat gas bag structure in the centre of the wind turbine 10. Aerostat area is schematically indicated as reference numeral 86 in figure 6.

~. 2000/02881

Although certain embodiments only of the invention have been described herein, it will be understood by any person skilled in the art that other modifications, variations, and possibilities of the invention are possible. Such modifications, variations and possibilities are therefore to be considered as falling within the spirit and scope of the invention and hence forming part of the invention as herein described and/or exemplified.

This invention having been described in its preferred embodiment, it is clear that it is susceptible to numerous modifications and embodiments within the ability of those skilled in the art and without the exercise of the inventive faculty. Accordingly, the scope of the invention is defined by the scope of the following claims.

Claims (49)

CLAIMS LN ce

1. An air turbine device for generating electric energy comprising: - a vertically mounted rotor with a plurality of airfoils, the airfoils being partially enclosed by a circumferential airfoil shrouding having a plurality of port holes on the outer circumference, - a plurality of air blowers being located on the outer periphery of the airfoil shrouding, and - a plurality of air ducts being respectively arranged between at least one air blower and a port hole, the air ducts being capable of blowing air from the air blower into the air duct in an align air stream manner so as to align air flow in the duct to an air stream flow that circulates in the airfoil shrouding and to turn the air turbine by driving the airfoil in a circular direction.

2. The air turbine device according to claim 1, further comprising at least one wind turbine, the wind turbine having a drive shaft being connected to at least one of said air blowers.

3. The air turbine device according to claim 2, wherein the drive shaft of the wind turbine is connected to the at least one air blower by a clutch.

4. The air turbine device according to any of claims 2 or 3, wherein the drive shaft of the wind turbine is connected to the at least one air blower by a gear box.

5. The air turbine device according to any of claims 2 or 3, wherein the drive shaft of the wind turbine is connected to the at least one air blower by a pulley.

6. The air turbine device according to any of claims 1 to 5, wherein a group of air blowers are connected to one air duct so as to multiply air flow and boost a higher air velocity into the air duct.

7. The air turbine device according to claim 6, wherein the group of air blowers comprises at least three air blowers.

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8. The air turbine device according to any of claim 6 or 7, wherein at least one of the air blowers of the group of air blowers is driven by an electric motor so as to sustain and boost air flow power in the air duct when wind energy is low.

9. The air turbine device according to claim 8, wherein the electric motor is powered by a renewable energy source.

10. The air turbine device according to claim 9, wherein the renewable energy source includes a solar electric power grid, a water wave electric power grid or a biomass electric power grid.

11. The air turbine device according to claim 8, wherein the electric motor is powered by a further electric wind turbine.

12. The air turbine device according to claim 8, wherein the electric motor is powered by an electric storing device.

13. The air turbine device according to any of claims 1 to 12, wherein the airfoil shrouding covers the airfoil ranging from the airfoil bottom side to the airfoil top side.

14. The air turbine device according to claim 13, wherein the airfoil shrouding covers the airfoil by preferably covering more than 320 degrees around the airfoil.

15. The air turbine device according to any of claims 1 to 14, wherein the airfoil shrouding covers the air turbine airfoil 360 degrees in circumference so as to serve as a wind break with wind flowing over and past the rotor of the air turbine.

16. The air turbine device according to any of claims 1 to 15, wherein the air flow in at least one of the plurality of air ducts is restricted so as to promote a higher velocity air flow in the air turbine.

17. The air turbine device according to claim 16, wherein the at least one of the plurality of air ducts comprises a wider inflow air section that tapers to a narrower outflow section.

18. The air turbine device according to any of claim 16 or 17, wherein the at least one of the plurality of air ducts further comprises remote controlled device at the narrow section of the air duct capable of narrowing or widening the air outlet section of the duct.

19. The air turbine device according to claim 18, wherein the remote controlled device comprises a valve.

20. The air turbine device according to any of claims 1 to 19, wherein the airfoil shrouding of the air turbine comprises air outflow port holes being connected into an outflow air duct.

21. The air turbine device according to claim 20, wherein the outflow air duct diverts air flow into an inlet air section of at least part of the air blowers so as to let the air blower continue an air flow circulation cycle.

22. The air turbine device according to any of claim 20 or 21, wherein the out flow air duct is aligned to let air flow in an in stream free flow.

23. The air turbine device according to any of claims 20 to 22, wherein a free air inflow port hole at the connection of the air blower and the air outflow duct is capable of balancing the suction air of the air blower and air pressure in the outflow duct.

24. The air turbine device according to any of claims 1 to 23, wherein the airfoil blades are covered on top and sides in the full circumference of the air turbine to form multiple compartments.

25. The air turbine device according to claim 24, wherein the airfoil compartments are capable of containing an up draught air pressure to float upward and in a circular air stream direction in the airfoil shrouding of the air turbine.

26. The air turbine device according to any of claims 24 to 25, wherein the air flow pressure is directed onto the airfoils of the air turbine through the air porting holes in the airfoil shrouding.

27. The air turbine device according to any of claims 24 to 26, wherein the air ducts are arranged at an angle onto the air porting holes of the airfoil shrouding so as to produce an air flow pressure in a forward thrust on the air turbine airfoil blades and at an angle to produce an up thrust on the airfoil blade cover of the air turbine rotor.

28. The air turbine device according to any of claims 1 to 27, further comprising aerostat compartments being fitted in the circumference of the rotor.

29. The air turbine device according to claim 28, further comprising aerostat compartments being fitted onto the rotor.

30. The air turbine device according to claim 28 or 29, wherein the aerostat compartments are mounted with belts and/or bolts

31. The air turbine device according to any of claims 28 to 30, wherein the aerostat compartments are stationary cover covering top and bottom, the stationary cover is fitted in the circumference of the air turbine and is fixed onto the airfoil shrouding.

32. The air turbine device according to any of claims 1 to 31, wherein the vertically mounted rotor of the air turbine has a diameter of at least 10 m, preferably 60 m or larger.

33. The air turbine device according to any of claims 1 to 32, wherein the vertically mounted rotor comprises at least two, preferably three airfoil blades.

34. The air turbine device according to any of claims 2 to 33, wherein the least one wind turbine is arranged as a multi unit vertical wind turbine being arranged at least 10 m above ground, preferably at 30 m or 45 m above ground.

35. The air turbine device according to any of claims 1 to 34, wherein wind turbines towers are placed at many inner and outer circumference rows of the air turbine device.

36. The air turbine device according to claim 35, wherein the wind turbine inner and outer tower rows have different alternate heights.

37. The air turbine device according to any of claims 35 to 36, wherein the wind turbine units have specific spaces in between to allocate for wind to flow through free across the air turbine.

38. The air turbine device according to any of claims 35 to 37, wherein the wind turbine towers top ends are braced together in circumference to secure towers in storm weather.

39. A method to multiply air flow and boost a higher air velocity into an air duct by providing an air turbine according to any of claims 1 to 38.

40. A method to sustain and boost air flow power in an air duct when wind energy is low by providing an air turbine according to any of claims 1 to 38.

41. A method to multiply air flow and boost a higher air velocity into an air duct by providing an air turbine according to any of claims 1 to 38.

42. A method to cover a vertical axis air turbine from crosswind turbulence and to contain a permanent circular in stream air flow in an enshrouded circular tunnel by providing an air turbine according to any of claims 1 to 38.

43. A method to apply multiple forces of air simultaneously on a plurality of airfoil blades of an air turbine airfoil to force and turn the air turbine rotor in a circular direction by providing an air turbine according to any of claims 1 to 38.

44. This method of claim 43 further comprising to maintain that the multiple forces of air reacts as one larger force on the air turbine rotor.

45. A method to produce up draught air pressure lift on the full circumference airfoil of a vertical axis air turbine to relieve the bearing weight of the turning air turbine rotor airfoil shrouding by providing an air turbine according to any of claims 1 to 38.

46. A method to induce a continuous air flow circulation in the air turbine air power system and to reduce air suction strain on the air blower rotor and promote a higher air

' capacity flow and a higher air velocity circulation cycléby 2009.4 228.8 i according to any of claims 1 to 38.

47. A method to alleviate the rotor weight drag of a vertical axis air turbine and to promote lift by providing an air turbine according to any of claims 1 to 38

48. An air turbine device, substantially as described herein with reference to the accompanying drawings.

49. A method of using air turbine device, substantially as described herein with reference to the accompanying drawings. DATED THIS 28™ DAY OF APRIL, 2009. HAH HN INC. ts for Applicant 19 f