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Further development of Enercon’s de-icing system Christoffer Jonsson, Enercon
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Further development of Enercon’s de-icing system Christoffer Jonsson, Enercon
1.
Further development of
ENERCON‘s de-icing system Winter Wind, Skellefteå, 2012-02-07 Christoffer Jonsson Site Assessment (+46) 766 31 09 83 christoffer.jonsson@enercon.de Filename: © Copyright ENERCON GmbH. All rights reserved.
2.
Griessee: 1x E-70,
2465 m.a.s.l. – Europe‘s highest turbine Photo: Swisswinds/ SIG 2 Filename: © Copyright ENERCON GmbH. All rights reserved.
3.
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! Filename: © Copyright ENERCON GmbH. All rights reserved.
4.
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 Filename: © Copyright ENERCON GmbH. All rights reserved.
5.
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 Filename: © Copyright ENERCON GmbH. All rights reserved.
6.
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 Filename: © Copyright ENERCON GmbH. All rights reserved.
7.
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 Filename: © Copyright ENERCON GmbH. All rights reserved.
8.
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. Filename: © Copyright ENERCON GmbH. All rights reserved.
9.
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) WEC 02 heating on WEC 01 heating off Yield difference 800.000 676.087 700.000 Total yield surplus: 579.905 569.974 600.000 870.000 kWh 490.729 477.533 500.000 energy yield [kWh] 397.636 353.515 324.655 322.572 400.000 279.210 279.061 300.000 211.519 153.767 200.000 72.981 100.000 9.931 0 Nov 09 Dez 09 Jan 10 Feb 10 Mrz 10 Filename: © Copyright ENERCON GmbH. All rights reserved.
10.
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 WEC 10 heating on WEC 11 heating off Yield difference 700.000 624.271 Total yield surplus: 600.000 500.839 650.000 kWh 485.738 430.993 500.000 416.693 energy yield [kWh] 335.896 400.000 284.686 280.959 265.914 249.403 300.000 138.533 132.007 200.000 86.493 69.846 100.000 15.045 0 Nov 09 Dez 09 Jan 10 Feb 10 Mrz 10 Filename: © Copyright ENERCON GmbH. All rights reserved.
11.
Results of rotor
blade de-icing test period in winter 2009/2010 Krystofovy- Dragaliden Location unit Hamry (CZ) (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. Filename: © Copyright ENERCON GmbH. All rights reserved.
12.
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 Filename: © Copyright ENERCON GmbH. All rights reserved.
13.
E-101 – Fan
and radiator system Filename: © Copyright ENERCON GmbH. All rights reserved.
14.
De-icing system for
the ENERCON E-126 7,5 MW •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. Pipe Air heating element Leading edge with hot air Electrical heating pads Ventilator Filename: © Copyright ENERCON GmbH. All rights reserved.
15.
De-icing system E-126,
thermography picture • 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 ! Filename: © Copyright ENERCON GmbH. All rights reserved.
16.
E-126, Inner blade
- pipe Filename: © Copyright ENERCON GmbH. All rights reserved.
17.
E-126, Inner blade
- full system Filename: © Copyright ENERCON GmbH. All rights reserved.
18.
De-icing system for
the ENERCON E-126 7,5 MW Pipe Air heating element Leading edge with hot air Electrical heating pads Ventilator Filename: © Copyright ENERCON GmbH. All rights reserved.
19.
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! Filename: © Copyright ENERCON GmbH. All rights reserved.
20.
Thank you for
your attention! Simple Safe Low cost Efficient Winter Wind, Skellefteå, 2012-02-07 Christoffer Jonsson Site Assessment (+46) 766 31 09 83 christoffer.jonsson@enercon.de Filename: © Copyright ENERCON GmbH. All rights reserved.
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