Gaia 11Kw

Farm & Small Commercial Property

This tried and tested wind turbine has existed in its present form for eleven years, providing the greatest reliability record of any turbine within the UK. This turbine is ideal for areas with moderate wind speed, due to its extremely large twin bladed rotor. Gaia turbines are often used in rural locations where performance is best away from obstacles.  Although erected by a crane maintenance is easy via the access ladder to the turbine head.

The Gaia-Wind turbine is in the ‘small wind turbine category’ and has a peak rated output of 11kW. It produces an energy yield that is practical for supplying electricity to properties such as private houses, farms, offices, small businesses and public buildings where the primary goal is to reduce the amount of electricity imported rather than generate specifically for export.

The turbine has been developed according to ‘Danish design’; the design basis for most of the large commercial turbines used today. Like its bigger relatives, it has a slow rotational speed (56 rpm) which is independent of the wind speed. It also incorporates many of the control and safety features from the large turbines.

The Gaia-Wind turbine is configured to give an optimal yield in moderate wind speed sites i.e. those with an annual average wind speed in the range of 4.5 - 7.5 m/s. As such it complements the wind conditions found in most rural areas of mainland Britain.

The turbine is usually connected to the grid at the property but can also be configured for connection to a diesel generator (wind-diesel system). With the grid connected version, the electricity provider replaces the standard meter for an import/export model allowing the turbine owner to export any excess production to the electricity grid.

NOTE: The Gaia-Wind 11 kW turbine uses an asynchronous generator to produce a grid matched output . It requires a 3 phase electrical connection. It does not require an inverter.

Design legacy

The two bladed Gaia-Wind small wind turbine was developed in the early 90’s in Denmark , a world leader in wind power. The first Gaia wind turbine has been operational since 1993, representing almost 20 years of operational experience

Visual Presentation

Tower: 18m high. Constructed from galvanised steel in either a lattice or tubular form.

  • The lattice open form merges into backgrounds such as trees or hills and fades with distance.
  • The tubular form compliments modern structures.
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    Rotor: Slow turning at nominal speed of 56 rpm (independent of wind speed). Light grey, reflection free fibreglass blades

    Turbine Footprint

    Assembly Height - The turbine assembly is mounted on an 18m high tower. The hub of the rotor is at 18.3 m.The rotor is a twin blade design and is manufactured as a single composite unit 13m in diameter. When in the vertical position, the tip of the rotor extends to a height of 24.8m and the lowest point is 11.8m above the ground.
    This is around 1/5th the height of a typical turbine found on a modern wind farm.

    Foundation – The bottom of the tower is bolted onto a reinforced concrete base with dimensions 5 x 5 x 0.55m. This is set in a hole 1m deep with a 0.45m layer of hard packed earth on top.

    Cabling- The turbine is connected to the building power supply at the main fuse box via an armoured cable buried at a depth of 0.75m.

    Greenhouse Gas Offsetting

    A Gaia-Wind turbine generating around 30,000 kWh of green electricity per year, will offset around 17 tonnes of CO2 emissions from existing energy generation . This is sufficient to bring the carbon footprint of the average four person household back to zero (household energy use + car + air travel)

    Control and Safety

    The Gaia Wind turbine has a sophisticated monitoring and control system with three levels of system protection to ensure the rotational speed and the output power remain under control in all wind conditions. The control system is housed in a metal cabinet at the base of the tower. Data can be output to a computer on site and an internet based monitoring sytem is under development.

    Noise

    Due to its constant and low rotational speed, the Gaia Wind turbine is amongst the quietest in its class (the aerodynamic noise of a turbine increases exponentially with an increase in the rotational speed).

     

     

     

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    Specification

    Architecture ............................... Upwind, 2 bladed rotor, self regulating
    Rated Power .............................. 11kW @10m/s
    BWEA Reference Power ...........
    Annual Energy Yield ................... 30,000kWh with Annual Mean Wind Speed (AMWS) of 5.5m/s

    Cut-In Wind Speed .................... 3.5m/s (7.8mph)
    Cut-Out Wind Speed ................. >25m/s (56mph)
    Survival Wind Speed ..................
    IEC Turbine Class ......................This turbine has a UK 'Clear Skys' accreditation number WT5038
    Control System ..........................
    Rotor Diameter .......................... 13m
    Rotor Speed ...............................Low constant speed 56rpm nominal
    Blade Type ................................
    Blade Material ........................... Glass fibre, mounted on Teeter hub
    Generator .................................. 11KW, 3 phase, 400 volts@50Hz (marine grade)
    Gearbox .................................... Two stage, gear ratio 1:18, low noise
    Emergency Braking .................. Control system activates mechanical brake if: wind speed exceeds 25m/s,
    abnormal vibration, grid disconnected or generator overheats.
    Also manual override - Red Button.
    Yaw Control .............................
    Tower Height ........................... 18m ( 60’)
    Tower Types ............................ Contructed from galvanised stell in either lattice or tubular form
    Tower Foundation ....................The bottom of the tower is bolted onto a reinforced concrete base with dimensions 5 x 5 x 0.55m.
    This is set in a hole 1m deep with a 0.45m layer of hard packed earth on top.
    Tower Top Mass ..................... nacelle and rotor - 900kg (excl tower)
    Design Longevity .................... 20 years minimum. Regular service inspections.
    Noise ....................................... Lp, 30m = 50dB(A).
    Lp,60m = 45dB(A).
    Operating Temperature Range ... -20°C - +50°C

    Power Curve Table

    Last Updated (Thursday, 18 April 2013 14:19)