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Wind Turbines on CO2 Neutral Luminaries in Urban Areas. Decrease the infrastractural cost Deploy where the grid is either underdeveloped or non- existent Increase people’s awareness of renewable energy. Why Bother ?. Challenges?. Low and unpredictable wind ressource

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Presentation Transcript
why bother

Decreasethe infrastracturalcost

  • Deploywhere the grid is eitherunderdeveloped or non-existent
  • Increasepeople’sawareness of renewableenergy

WhyBother?

Challenges?

  • Low and unpredictablewind ressource
  • Low solar radiation in winter in northerncountries
  • Lack of experimentalverification of the performance
  • Uncertaincostfunctions
  • Low lift-drag ratio for small Reynolds numbers
  • Lower power efficiencythan for mega-watt turbines
development of a carbon neutral luminaire for the urban environment

Model the windcharacteristics in urban environment

  • Develop a time-marching simulation algorithm for the luminary
  • Simulatesome of the existingdesigns
  • Design a new autonomousluminary

Development of a carbon neutral luminaire for the urban environment

Exemplary hybrid luminary equipped with a horizontal axis wind turbine and a photovoltaic panel; United Electricity

assessment of wind climate

Tools and methods

  • Simulatedenvironment: 1-2 story single familybuildings with gableroofs
  • 1-year long time series weremeasured 20 km north of Copenhagen
  • Data wascorrected to account for buildingheight and densityusingthe roughness step method

Assessment of windclimate

Computational model for the luminary

  • Turbines modeled by tablelookupusing the correctedwindmeasurement and producer-supplied power curves
  • PV panels modeled using third-party supplied illumination data for the considered Copenhagen district
  • Device parameters (effectiveareas, heightetc.) wereassumedidentical for all the luminaries
producer supplied power curves

Simulated turbines

Producer-supplied power curves

Green Power

United Electricity

Sanya

wind climate

Results

Wind climate

Time series of the 10-min-average wind speed used in the simulations together with the 30-day-window running mean; 8 m reference height

One-week extract from the time series of the 10-min-average wind speed used in the simulations; 8 m reference height

modelling the luminary

Results

Modelling the luminary

Time series of the energy level in the batteriesinthe simulated luminaries

Balance between energy production by the turbine and the photovoltaic panel, and the consumption by the LED; United Electricity HAWT

slide8

Choiceof the present rotor

  • Currentproducer-supplied power curvesshouldbeverifiedexperimentally (in progress)
  • Low operationalwindspeeds point at a Savonius rotor
  • Savonius’ low tip speed wouldbebeenficial in urban environment for safetyreasons
  • Vertical-axis turbines areeasier to fitaesthetically
  • Rapidlychangingwinddirection points at vertical-axis

Present design 90-degree-twist single-stage Savonius wind turbine with small-size end plates mounted and the top and bottom of the rotor; source: Henning Larsen Architects A/S

slide9

Conclusions:

  • Three different wind turbines used in hybrid luminaries were presented
  • Wind climate in Copenhagen district comprising 1-2 story single family buildings was simulated
  • Luminaries with the turbines were modelled using producer-supplied power curves
  • The analysis showed the need for balancing the size of the wind turbine, the photovoltaic panels, luminary and the battery the best way
  • A new 90-degree-twist single-stage Savonius wind turbine with small-size end plates mounted and the top and bottom of the rotor was proposed
slide10

This project was funded by:

ELFORSK

Project number 343-021

“Development of a carbon neutral

luminaire for the urban environment”.

Thankyou!