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              VERTICAL AXIS WIND TURBINES from REI

Product Range : 2.5Kw, 5Kw, 10Kw, 20Kw, 30Kw, 50Kw and 100Kw

More than 25 years experience in research and design has led to the resurrection of the Darrius vertical axis wind turbine (VAWT), which has many inherent advantages over other wind turbine designs.

VAWTs in General

The advantage of the VAWT is its ability to take its wind from any direction, without having to be orientated by yaw motors and gear trains. It can average the output power by its own mass inertia.

Low start up wind speeds

They do not require a massive tower structure. This means that they can be of lower overall height and located in sites where HAWTs are prohibited

The REI Darrieus VAWT

The generator and control equipment are at ground level making maintenance of the whole system much easier. No need to hire cherrypickers or to use hydraulic rams to drop the mast and generator for repairs or maintenance.

Each turbine has a direct driven VLS permanent magnetic alternator with no gearbox or slip ring assembly required to transmit the output power away from the nacelle (rotor) assembly.

No gyroscopic stress on the hub assembly, as seen on HAWT machines, as the aerofoils are orientated into the wind or out of the wind.

No coning stress, as the wing assembly is the same distance from the mast assembly at all times.

Very quiet. Less than 45 db at 5 meters

Using the purpose designed lattice tower located in its own excavated hole and then backfilled with soil NO CONCRETE IS NEEDED FOR THE BASE. This saves money and installation time and is much more environmentally friendly.

 

STAND ALONE OR GRID CONNECTED SYSTEMS ARE AVAILABLE

2.5 Kw VAWT

Aerofoil Height = 2.5m

Cross- arm diameter = 2.7 meters

Swept area = 6.7 square meters per set of wings

Number of aerofoils = 3

Rotor speed= 50 rpm

Control = Aerofoil stall

Nominal Power = 2500 Watts

Tower Type = Tapered steel lattice

Height = 6 , 9 or 12m

Base = 2, 3 or 4m

Start up wind speed = 1.5m/sec

Cut-in wind speed =  3.5 m/sec

Rated power wind speed = 10m/sec

Stall cut-in wind speed =  27.5 m/sec

Survival wind speed better than 55 m/sec

 

 

5 Kw VAWT

Aerofoil Height = 2.5m

Cross- arm diameter = 2.7 meters

Swept area = 6.7 square meters per set of wings

Number of aerofoils = 3 or 6

Rotor speed= 50 rpm

Control = Aerofoil stall

Nominal Power = 5000 Watts

Tower Type = Tapered steel lattice

Height = 6 , 9 or 12m

Base = 2, 3 or 4m

Start up wind speed = 1.5m/sec

Cut-in wind speed =  3.5 m/sec

Rated power wind speed = 10m/sec

Stall cut-in wind speed =  27.5 m/sec

Survival wind speed better than 55 m/sec

Noise level = Less than 45db at 10mt

10 Kw VAWT

Aerofoil Height = 2.5m

Cross- arm diameter = 2.7 meters

Swept area = 6.7 square meters per set of wings

Number of aerofoils = 3 , 6 or 12

Rotor speed= 50 rpm

Control = Aerofoil stall

Nominal Power = 10000 Watts

Tower Type = Tapered steel lattice

Height = 6/9/12/15/18/21 or 24 Meters

Base = 2/3/4/5/6/7/8 m

Start up wind speed = 1.5m/sec

Cut-in wind speed =  3.5 m/sec

Rated power wind speed = 10m/sec

Stall cut-in wind speed =  27.5 m/sec

Survival wind speed better than 55 m/sec

Noise level = Less than 45db at 10mt

20 Kw VAWT

Aerofoil Height = 2.5m

Cross- arm diameter = 5.3 meters

Swept area = 13.75 square meters per set of wings

Number of aerofoils = 3 , 6 or 12

Rotor speed= 33 rpm

Control = Aerofoil stall

Nominal Power = 20000 Watts

Tower Type = Tapered steel lattice

Height = 6/9/12/15/18/21 or 24 Meters

Base = 4/5/6/7/8 m

Start up wind speed = 1.5m/sec

Cut-in wind speed =  3.5 m/sec

Rated power wind speed = 10m/sec

Stall cut-in wind speed =  27.5 m/sec

Survival wind speed better than 55 m/sec

Noise level = Less than 45db at 10mt

30 Kw VAWT

Aerofoil Height = 2.5m

Cross- arm diameter = 5.3 meters

Swept area = 13.75 square meters per set of wings

Number of aerofoils = 3 , 6 or 12

Rotor speed= 33 rpm

Control = Aerofoil stall

Nominal Power = 30000 Watts

Tower Type = Tapered steel lattice

Height = 6/9/12/15/18/21 or 24 Meters

Base = 4/5/6/7/8 m

Start up wind speed = 1.5m/sec

Cut-in wind speed =  3.5 m/sec

Rated power wind speed = 10m/sec

Stall cut-in wind speed =  27.5 m/sec

Survival wind speed better than 55 m/sec

Noise level = Less than 45db at 10mt

 

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