further development of enercon’s de-icing system christoffer jonsson, enercon

© Copyright ENERCON GmbH. All rights reserved. Filename:

Further development of ENERCON‘s

de-icing system

Winter Wind, Skellefteå, 2012-02-07

Christoffer Jonsson

Site Assessment

(+46) 766 31 09 83 [email protected]


Griessee: 1x E-70, 2465 m.a.s.l. – Europe‘s highest turbine

2 Photo: Swisswinds/ SIG


Risks with icing on wind turbines

• Unbalance of rotor blades lead to oscillations causing higher loads and probably shut down.

• Ice pieces can fall down in a reasonable radius around the WEC.

• Degradation of aerodynamic efficiency resulting in decreased yield.

• Total stop of yield production due to ice detection.

• Operating turbines in cold climate is not an easy task!


Simplicity

• The ENERCON de-icing system is based on a simple yet powerful idea (hot air inside the

blades).

• All parts can be changed within hours from failure by a technician.

• The technic is well proven for years. Third party validation available from Deutsche

WindGuard.

• All new models will have this feature as

an option.

• It works great!

4


Safety

• ENERCON’s de-icing system is not affected by lightning strikes.

• No crane is needed to repair or perform maintenance work on the system.

• Air flow is limited to a specific area of the blade but will heat the whole volume it travels in.

• No enhanced risk for electrical malfunction in or outside of the blade.

• The amount of possible problems is very low!

5


Low Costs

• ENERCON’s de-icing system can be repaid in just a couple of months (depending on the

site).

• Spare parts are cheap and can be installed, changed, up-dated and repaired with very small

effort.

• Costs for maintaining the de-icing system are very low.

• It’s a cheap way of increasing the availability!

6


Efficient

• ENERCON’s first ice detection and de-icing system was installed in 2004.

• During 2009 – 2010 ENERCON added de-icing during operation of the turbine. This was a huge

improvement.

• According to the validation performed by Deutsche WindGuard our customers can estimate to

minimize the icing losses and gain 10 – 15 % in annual energy production due to the efficient

de-icing system during operations.

• On severe icing sites the gain from minimized icing losses can even

add up to 25% of additional energy yield.

7


Test of rotor blade de-icing system performance

The efficiency of the rotor blade de-icing system has been tested for 5 months in winter 2009/2010

in locations at

a) Dragaliden in Sweden and

b) Krystofovy-Hamry in Czech Republic.

On both locations 2 WECs E-82 2 MW have been compared. Both WECs are located next to each

other.

On one WEC the rotor blade heating was activated while it was deactivated on the other WEC.


Energy yield surplus due to Rotor blade de-icing Dragaliden

energy meter readings

Difference in yield per month between heated and unheated WEC E-82

2MW at location in Dragaliden (SE)

397.6

36

490.7

29

676.0

87

477.5

33

579.9

05

324.6

55

211.5

19

353.5

15

279.0

61

569.9

74

72.9

81

279.2

10

322.5

72

153.7

67

9.9

31

0

100.000

200.000

300.000

400.000

500.000

600.000

700.000

800.000

Nov 09 Dez 09 Jan 10 Feb 10 Mrz 10

en

erg

y y

ield

[k

Wh

]

WEC 02 heating on WEC 01 heating off Yield difference

Total yield surplus:

870.000 kWh


Energy yield surplus due to Rotor blade de-icing in

Krystofovy-Hamry (CZ), energy meter readings

Difference in yield per month between heated and unheated WEC E-82

2MW at location in Czech Republic

500.8

39

416.6

93

280.9

59

335.8

96

624.2

71

430.9

93

284.6

86

15.0

45

249.4

03

485.7

38

69.8

46 1

32.0

07

265.9

14

86.4

93 138.5

33

0

100.000

200.000

300.000

400.000

500.000

600.000

700.000

Nov 09 Dez 09 Jan 10 Feb 10 Mrz 10

en

erg

y y

ield

[k

Wh

]

WEC 10 heating on WEC 11 heating off Yield difference

Total yield surplus:

650.000 kWh


Results of rotor blade de-icing test period in winter 2009/2010

Location unit

Krystofovy-

Hamry (CZ)

Dragaliden

(SE)

Amount of test month in winter month 5 5

Energy meter difference between WEC

with and without blade de-icing kWh 870.000 650.000

Average monthly energy surplus in winter

month with icing kWh 174.000 130.000

Percentage of energy surplus in relation to

WEC without de-icing system % 48 54

The energy yield surplus due to the rotor blade de-icing system strongly depends on

meteorological conditions like icing and wind speed on site.


Future development of ENERCON’s de-icing systems

• ENERCON has developed ice detection solutions and de-icing systems for years.

• We see a growing interest for markets in cold climate since the world wide economic difficulties

in 2008.

• ENERCON is well prepared and we have validated proven technology to support our customers

needs.

• The next step will be to include this de-icing system to our newer and

bigger turbines…

12


E-101 – Fan and radiator system


•The new de-icing system for the E126 is under development.

•The de-icing system is divided in two different systems. A new inner blade concept and the

approved concept for the outer blade.

Ventilator

Air heating element

Electrical heating pads

Pipe

Leading edge with hot air

De-icing system for the ENERCON E-126 7,5 MW


• Infrared photo with a first result of heating tests of the inner blade while the rotor is

rotating.

• Heating pads inside the steel blade heating up the outer surface and hot air heating up

the outer blade.

• Please notice that the mass of the inner blade ~ 60t !

De-icing system E-126, thermography picture


E-126, Inner blade - pipe


E-126, Inner blade - full system


De-icing system for the ENERCON E-126 7,5 MW

Ventilator

Air heating element

Electrical heating pads

Pipe

Leading edge with hot air


Main advantages with ENERCON rotor blade heating is …

• All systems are safe against lightening

• There are only two additional approved components

• There is no need to use specially designed blades

• Inexpensive

• Easy to handle for maintenance (all components are exchangeable)

• High efficiency to reduce energy yield loss due to icing

• System can work while rotor is rotating => leads to minimize the power consumption from the

grid

• It is simple, safe and works just great!


Winter Wind, Skellefteå, 2012-02-07

Christoffer Jonsson

Site Assessment

(+46) 766 31 09 83 [email protected]

Thank you for your attention!

Simple

Safe

Low cost

Efficient

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