Further development of Enercon's de-icing system Christoffer ...
Transcript of Further development of Enercon's de-icing system Christoffer ...
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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]
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Griessee: 1x E-70, 2465 m.a.s.l. – Europe‘s highest turbine
2 Photo: Swisswinds/ SIG
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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!
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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!
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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!
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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!
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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.
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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.
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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
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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
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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.
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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…
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E-101 – Fan and radiator system
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•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
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• 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
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E-126, Inner blade - pipe
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E-126, Inner blade - full system
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De-icing system for the ENERCON E-126 7,5 MW
Ventilator
Air heating element
Electrical heating pads
Pipe
Leading edge with hot air
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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!
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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