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State-of-the‐art of ice detection

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State-of-the‐art of ice detection

  1. 1. State of the art in ice detection - a need for standards Winterwind 2012 Petteri Antikainen VTT Technical Research Centre of Finland
  2. 2. 2012-02-12 2 Content §  Background/definitions §  Current detectors §  Proposal: Standard icing conditions §  Proposal: Classification for meteorological ice detectors Photo by Manu Friman
  3. 3. 2012-02-12 3 Background: Definitions §  Cold climate: icing climate and/or low temperature §  Icing: §  IEA Task 19:
  4. 4. 2012-02-12 4 Background and an example: Site classification §  IEA Task 19: Instrumental IEA Ice class Met. icing Production loss icing % of year % of year % of annual production 5 >10 >20 > 20 4 5-10 10-30 10-25 3 3-5 6-15 3-12 2 0.5-3 1-9 0.5-5 1 0-0.5 <1.5 0 - 0.5
  5. 5. 2012-02-12 5 Some existing detectors §  Commercial: §  Labkotec - meteorological icing §  Goodrich/Rosemount – freezing rain §  Combitech – instrumental icing §  Commercial? §  HoloOptics §  Rotor ice detection systems: §  Bosch Rexroth ( IGUS) §  Moog (Insensys) §  Other: §  2…3-anemometers (cups/ sonics), vanes, temp+humidity???
  6. 6. 2012-02-12 6 Proposal for Standard icing conditions (for lab testing) Stationary Blade conditions o o Temperature -5 C -5 C Wind speed 7 m/s 40 m/s 3 3 Water content 0,2 g/m 0,05 g/m Droplet size MVD 20 µm 20 µm §  Wind speed of 40m/s for blade is calculated for modern variable speed pitch turbine at 2/3R when wind speed is 7m/s
  7. 7. 2012-02-12 7 Already another proposal for chancing definitions for classification criteria for meteorological ice detectors Stationary More demanding for testing? o o Temperature -5 C -5 C Wind speed 7 m/s 7 m/s 3 3 Water content 0,2 g/m 1 g/m Droplet size MVD 20 µm 20 µm §  Two criteria: detection speed and ability to recover §  ”Stationary conditions” are more common §  ”More demanding” is putting emphasis on ability to recover (and practicality for testing). §  The industry is not ready for a complicated classification method which shoud include a matrix of conditions, but a need to have common rules exists:
  8. 8. 2012-02-12 8 Proposal for Classification criteria for meteorological ice detectors in standard icing conditions MID class Detection time less than Class 1 1 minute Class 2 10 minutes Class 3 60 minutes Requirements: - recovery for detection mode in 30 min - 5 units to be tested Photo by Manu Friman
  9. 9. 2012-02-12 9 ”Proposal” for classification of instrumental icing detectors § ? §  Sensitivity to stationary conditions? §  Robustness for harsh conditions? §  Ability to rotate in any conditions?
  10. 10. 2012-02-12 10 In general there is a need for: §  Best practices, recommendations, rules and regulations, classifications, standards §  Not for ice detection only, the same applies to other instruments as well: §  There is practically no classified anemometers for cold climate ! §  Turbines, loads etc… §  Bankability!
  11. 11. 2012-02-12 11 VTT - 70 years of technology for business and society

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