1. enviria.com BladeCleaning® - Limpieza de palas The solution to power loss BladeCleaning ® www.bladecleaning.com Limpieza de Palas

2. enviria.com BladeCleaning® - Limpieza de palas JUSTIFICATION Double Stall – Aerodynamic failure

3. enviria.com BladeCleaning® - Limpieza de palas 3 Double Stall – Aerodynamic failure Power losses up to 50 % from wind speeds over 10 m/s. Normal power curve Double Stall affected power curve

4. enviria.com BladeCleaning® - Limpieza de palas 4 Double Stall – Cause Accumulation of insects on the leading edge of the blades

5. enviria.com BladeCleaning® - Limpieza de palas 5 Double Stall – Consequences Expected consequences in wind farm management

6. enviria.com BladeCleaning® - Limpieza de palas 6 Double Stall – Process Low wind speed Insects fly around the turbines attracted by the colour and brightness Rotating blades pass by the clouds of insects causing accumulation of dirt on the leading edge High wind speed Insects do not fly at high wind speeds Blade roughness causes an unexpected aerodynamic failure (double stall)

7. enviria.com BladeCleaning® - Limpieza de palas 7 Double Stall – References Double stall caused by insects is widely documented

8. enviria.com BladeCleaning® - Limpieza de palas SOLUTION APPROACH BladeCleaning ® System

9. enviria.com BladeCleaning® - Limpieza de palas 9 Double Stall – Solutions Manual cleaning of the blades produces the recovery of the turbine’s power curve

10. enviria.com BladeCleaning® - Limpieza de palas 10 Double Stall – Solutions Manual cleaning is unsuitable: Turbine has to be stopped No wind is required to operate A minimum of three workmen is needed Cleaning time: 4 hours/WTG Turbine is loosing power until conditions are appropriate to perform a manual cleaning High operational cost Depends on the availability of specialized equipment Depends on the availability of specialized personnel Risky operation

11. enviria.com BladeCleaning® - Limpieza de palas 11 Double Stall – Solutions Natural sequence:

12. enviria.com BladeCleaning® - Limpieza de palas 12 Double Stall – Solutions Design of a device that imitates a rainfall event: Simple Cost effective Does not require stopping of turbine Does not require access to rotor Does not require specific qualification Does not require direct contact with the blade Independent of wind farm operation Minimum maintenance Robust Reliable

13. enviria.com BladeCleaning® - Limpieza de palas 13 BladeCleaning ® - Operation Water streams are projected against the wind; the cloud of water generated is ‘cut’ by the passing blade Water impact, moisturising, degreasing and dragging effects produce: Decomposition of attached particles on the blade Accumulated material detaches from the blade surface Centrifugal force pushes rests of insects to end of blade Material leaves the blade at the tip

14. enviria.com BladeCleaning® - Limpieza de palas 14 BladeCleaning ® - Operation The cleaning process is performed while the turbine is in operation, this means: The angle of impact between the blade and the water is the same as the angle between blade and flying insects The efficiency of the cleaning is maximum on the leading edge of the blade. The leading edge:  Is the section of the blade more susceptible to soil  Plays a key role in the efficiency of the turbine

15. enviria.com BladeCleaning® - Limpieza de palas 15 BladeCleaning ® - Operation The device is orientated against the dominant wind direction The cleaning fluid is sprinkled (against the wind) at a given pressure This generates a cloud of water + cleaning agent that is ‘cut’ by the passing blades The whole surface of the blade is reached: Inner side of blade (direct flow) Leading edge (passing blade impacts with the flow) Outer side (returning flow – wind effect)

16. enviria.com BladeCleaning® - Limpieza de palas 16 BladeCleaning ® - Operation Wind Rotor direction Impact on inner side Impact on leading edge Impact on outer side Water + cleaning agent cloud

17. enviria.com BladeCleaning® - Limpieza de palas 17 BladeCleaning ® - Patent Patented system and utility model Registry of mark

18. enviria.com BladeCleaning® - Limpieza de palas SYSTEM OPERATION BladeCleaning ® System

19. enviria.com BladeCleaning® - Limpieza de palas 19 BladeCleaning ® - Operation Turbine always in operation Cleaning performance: 2 WTG/h Flexibility System can be deployed on any turbine. Completely adaptable to the requirements of any wind farm.  Stall controlled turbines  Pitch controlled turbines Applications  Dirt (in general)  Insects  Dust  Oil  Ice

20. enviria.com BladeCleaning® - Limpieza de palas 20 BladeCleaning ® - Results

21. enviria.com BladeCleaning® - Limpieza de palas 21 BladeCleaning ® - Application sequence Dirt in blades detected (Loss on power curve) Dirt in blades detected (Loss on power curve) Recovery of power curve Application BladeCleaning® Application BladeCleaning® No stopping of turbine

22. enviria.com BladeCleaning® - Limpieza de palas 22 BladeCleaning® Services 1. Loss of production assessment 2. Installation of fixed BladeCleaning® devices on turbines 3. Performance of autonomous cleaning operations

23. enviria.com BladeCleaning® - Limpieza de palas 23 Real production analysis Comparison against theoretical production Evaluation of loss of production Economic analysis BladeCleaning ® Services Loss of production assessment

24. enviria.com BladeCleaning® - Limpieza de palas 24 Stopping of turbine: 3 hours Attachment device-tower: magnetic Immediately operational Adaptable to any make of turbine No external power source needed BladeCleaning ® Services Installation

25. enviria.com BladeCleaning® - Limpieza de palas 25 BladeCleaning ® Services Cleaning operation

26. enviria.com BladeCleaning® - Limpieza de palas 26 BladeCleaning ® Services Cleaning operation – Dragging effect

27. enviria.com BladeCleaning® - Limpieza de palas 27 BladeCleaning ® Customized design Recurrent cleaning operations Autonomous Immediate No stopping of turbine

28. enviria.com BladeCleaning® - Limpieza de palas 28 BladeCleaning ® Service includes: Wind farm logbook maintenance Continued improvement assessment

29. enviria.com BladeCleaning® - Limpieza de palas BladeCleaning ® Economic analysis

30. enviria.com BladeCleaning® - Limpieza de palas 30 BladeCleaning® - Economic analysis Evaluation of the observed power curve: 50 % Loss of production 50 %

31. enviria.com BladeCleaning® - Limpieza de palas 31 BladeCleaning ® - Economic analysis Calculation for a typical 1 MW wind farm Nominal power:1.000 kW Equivalent annual hours:2.500 h Theoretical production:2.500.000 kWh Selling price:0,08 €/kWh Predicted revenue:200.000 €/year Double Stall consequences Average loss in power curve:20 % Loss of production:500.000 kWh Loss in revenue:40.000 €/year BladeCleaning® system may increase revenue up to 40.000 €/year/MW

32. enviria.com BladeCleaning® - Limpieza de palas BladeCleaning ® Contact informacion@bladecleaning.com www.bladecleaning.com (+34) 91.799.70.27 Presentation by enviria enviria.com