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De-icing on Wind Mill Generators

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This presentation highlight the benefit of Engineering Simulation Technologies applied on Green Energy field. In particularly, simulation technologies are fundamental for design, and fine tuning, of De-icing sub-systems so predict loss of performance, operating limits, damages, etc. on Wind Mill generators in cold climate.

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De-icing on Wind Mill Generators

  1. 1. Wind energy in cold climates
  2. 2. Wind Turbine Icing  Wind turbine icing causes:  from 5% to 30% annual production loss  Increased loads due to weight and deteriorated aerodynamics  safety issues  noise 06/11/2015 2
  3. 3.  CFD  Airfoil, blade aerodynamics  Turbine performances  Blade loading  Icing conditions  Anti-icing and de-icing  FEA:  Blade composite materials design and optimization  Components mechanical and thermal analysis  Support to the design / tuning of sensors for ice detection  FLUID-STRUCTURE-INTERACTION Offerings for Wind Turbine Industry Optimization of anti-icing power distribution 3 06/11/2015
  4. 4.  Blade Icing Protection System Design  Ice accretion in different environmental scenarios  Anti-icing and de-icing conditions  Optimization of hot air de-icing systems  Optimization of electro-thermal heating: power distribution and coverage  Support to the the design of ice detection systems  Wind Farm Site Assessment for Icing  Simulation of long icing events  Prediction of annual production loss due to icing  Assessment of investment risk in cold climates (cost vs benefit of Ice Protection Systems) Offerings for Wind Turbine Industry – cold climate 4 06/11/2015
  5. 5.  Prediction of critical icing scenarios → REDUCED RISK OF DAMAGES, INCREASED SAFETY  Prediction of annual production losses → REDUCTION OF INVESTMENT RISK  Design and optimization of de-icing and anti-icing systems → REDUCED DOWNTIME  INCREASED PRODUCTION → REDUCED ENERGY CONSUMPTION  LOWER COSTS  More reliable ice detection systems: → REDUCED DOWNTIME  INCREASED PRODUCTION → REDUCED ENERGY CONSUMPTION  LOWER COSTS Value of simulation 5 06/11/2015
  6. 6. Icing of wind turbines Ice Protection Systems
  7. 7. Wind Turbine Icing: mechanism  Icing occurs when subcooled droplets impinge on cold surfaces  Ice accretion results in substantial distortions of the flow characteristics  Shape  Roughness  Performances deteriorate  Loading  Safety issues 06/11/2015 7
  8. 8. 8 Ice Accretion Simulation Performance degradation assessment Efficient design of Ice Protection Systems Ice effect and prevention 06/11/2015
  9. 9. 9 FENSAP Flow solution, CHT DROP3D Impingement study ICE3D Ice accretion modelling Ice accretion simulation 06/11/2015
  10. 10. Different icing scenarios 1006/11/2015
  11. 11. Wind Turbine Performance Degradation Clean Glaze Rime High speed Large Diameter Torque(Nm) 06/11/2015 11 Production loss
  12. 12. De-icing - Hot air systems  Hot air is fed and distributed on the leading edge and between the shear webs  Benefits of simulation:  More even hot air distribution and reduced pressure losses  More even temperature and de-icing heat fluxes  Minimization of time needed to de-ice 1206/11/2015
  13. 13. Electro-thermal systems  Electro-thermal pads are located between the shell layers  Benefits of simulation:  Optimization of coverage and power distribution  minimum power  More even temperature and anti and de-icing heat fluxes  Minimization of time needed to de-ice 13 1 2 Optimization of anti-icing power distribution 06/11/2015
  14. 14. Anti-Icing Power Requirements  Power to prevent ice and to evaporate the water collecting on the blade.  Higher power [W/m2] at the tip  Higher power in rime ice conditions 1406/11/2015 Glaze: lower heat flux [W/m2]Rime: higher heat flux [W/m2]
  15. 15. Ice Protection – Net Power Gain Production increment due to Ice Protection Cost of Ice Protection Net Power Gain > 0 15
  16. 16. Wind energy in cold climates www.enginsoft.com for more information

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