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Ice throw reloaded – studies at Guetsch and St. Brais

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Ice throw reloaded – studies at Guetsch and St. Brais

  1. 1. Ice throw studies Gütsch and St. Brais February 8, 2012 René Cattin
  2. 2. Icing in wind energy Ice throw studies | Seite 2 | 2012-02-08
  3. 3. Icing in Switzerland Wind map of Switzerland Ice throw studies | Seite 3 | 2012-02-08
  4. 4. Icing in Switzerland Icing map of Switzerland Ice throw studies | Seite 4 | 2012-02-08
  5. 5. Gütsch 2‘300 m asl Ice throw studies | Seite 5 | 2012-02-08
  6. 6. Gütsch Does ice throw occur? Enercon E-44 - How often? - How far? - How heavy? - Where? Enercon E-40 Enercon E-44 Ca. 7 days/year meteorological icing Ca. 30 days/year instrumental icing Ca. 150 days/year temperature below 0°C Wind turbines equipped with blade heating Ice throw studies | Seite 6 | 2012-02-08
  7. 7. Alpine Test Site Gütsch COST Action 727: Atmospheric Icing on Structures 2005 to 2009 Ice throw studies | Seite 7 | 2012-02-08
  8. 8. Method After each icing event, the area around the wind turbine is inspected for ice throw. All found ice fragments are recorded -  Distance -  Angle -  Size -  Weight -  Type of ice (rime, glaze, wet snow) -  Photo of ice fragment Ice throw studies | Seite 8 | 2012-02-08
  9. 9. Method Ice throw studies | Seite 9 | 2012-02-08
  10. 10. Method Ice throw studies | Seite 10 | 2012-02-08
  11. 11. Methodik •  Not all events could be captured •  Inspection partly delayed •  Exact time of ice throw unknown •  No distinction between ice throw and ice fall Inspections during 4 winters (2005 bis 2009) à 32 icing events recorded à 228 ice fragments documented à Also during summer Ice throw studies | Seite 11 | 2012-02-08
  12. 12. Ice throw study Gütsch Maximum distance: 92m (2.25 rotor diameter) Maximum weight: 1.8 kg Ice throw studies | Seite 12 | 2012-02-08
  13. 13. Ice throw study Gütsch Ice throw studies | Seite 13 | 2012-02-08
  14. 14. Ice throw study Gütsch Ice throw studies | Seite 14 | 2012-02-08
  15. 15. Ice throw study Gütsch Icing Föhn à Risky areas seem to be dependant on wind statistics under icing consitions Ice throw studies | Seite 15 | 2012-02-08
  16. 16. Ice throw study Gütsch Types of ice Rime Glaze Wet snow Ice throw studies | Seite 16 | 2012-02-08
  17. 17. Ice throw study Gütsch Distance to wind turbine 50% Rotor blade Ice throw studies | Seite 17 | 2012-02-08
  18. 18. Ice throw study Gütsch Angle relative to wind turbine Ice throw studies | Seite 18 | 2012-02-08
  19. 19. Ice throw study Gütsch Resulta te Ice throw studies | Seite 19 | 2012-02-08
  20. 20. Conclusions •  Ice throw occurs •  Wind conditions during icing event define risk areas •  Ice throw when blade is moving downwards? •  50% of ice fragments found under rotor blade •  Heavy ice fragments (> 600 g) under rotor blade •  Ice throw also during summer time à Übertragbarkeit der Resultate auf grössere WEA?? Ice throw studies | Seite 20 | 2012-02-08
  21. 21. Counter measures •  Routing of winter walkway was changes •  Warning signs were installed Ice throw studies | Seite 21 | 2012-02-08
  22. 22. Conclusions Further study during winter 2011/12 2 Enercon E-82 Hub height 78 m Enercon blade heating St. Brais 1‘100 m asl No real icing events so far Ice throw studies | Seite 22 | 2012-02-08
  23. 23. Ice throw model SWIM •  Simple Wind turbine Icethrow Model Ice throw studies | Seite 23 | 2012-02-08
  24. 24. Ice throw model SWIM •  Simple Wind turbine Icethrow Model Ice throw studies | Seite 24 | 2012-02-08
  25. 25. Ice throw model SWIM •  Simple Wind turbine Icethrow Model Ice throw studies | Seite 25 | 2012-02-08
  26. 26. Thank you… METEOTEST …for your attention Fabrikstrasse 14 CH-3012 Bern www.meteotest.ch Ice throw studies | Seite 26 | 2012-02-08

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