WOODEN TOWERS FOR WIND ENERGY PLANTS

Transcription

1 WOODEN TOWERS FOR WIND ENERGY PLANTS

2 Copyright Materials This presentation is protected by US and International Copyright laws. Reproduction, distribution, display and use of the presentation without written permission of the speaker is prohibited. TIMBERTOWER GmbH 2014

3 Program Education Credit Information Canadian Wood Council, Wood WORKS! and the Wood Solutions Fair is a Registered Provider with The American Institute of Architects Continuing Education System; the Architectural Institute of British Columbia and the Engineering Institute of Canada. Credit earned on completion of this program will be reported on behalf of members of each CES provider for those who complete a participation form at the registration counter. Certificates of Completion for non-aia, AIBC or EIC members are available on request. This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.

4 Table of Contents Abstract Tower assembly Details Monitoring A look into the future Questions and Answers

5 Abstract AN ALTERNATIVE: More economic towers for wind energy plants TIMBERTOWER develops, erects and distributes wooden towers for multi-megawatt wind energy plants including foundations. A MASTERPIECE OF ENGINEERING: Consistently renewable energy TIMBERTOWER is a high-tech company, which connects the construction of wind energy plants with modern timberwork. As the first company worldwide TIMBERTOWER uses wood for tower construction an efficient and ecological concept. Since 2012 TIMBERTOWER operates the world s first wind energy plant installed on a wooden tower und demonstrates that wood is the better material.

6 Abstract 2008 Foundation of TIMBERTOWER GmbH in Hannover. The Managing Directors are Dipl.-Ing. Gregor Prass and Dipl. economist Holger Giebel. Conclusion of first financing and start of operative business Completion of certification process of the wooden tower with 100 m hub height for a 1.5MW Vensys turbine by TÜV NORD Proof of concept with the erection of a test tower at the premises of Holzbau Cordes Conclusion of the second financing by Impulsus clean Technologies GmbH, which takes over the majority of the company Erection of the first prototype: 1.5MW Vensys 77 with 100m hub height in Hannover Marienwerder Development of the wooden tower with 140m hub height Completion of type testing and certification of the 140m tower and development of a wooden foundation.

7 Abstract Investor secures financing for years Since December 2011 the entrepreneur Prof. Edwin Kohl via his investment company Impulsus clean Technologies GmbH is the majority shareholder of TIMBERTOWER GmbH. He is the founder of KOHL MEDICAL AG and Impulsus clean Technologies GmbH. The shareholding in TIMBERTOWER GmbH secures the financial basis for the company s operative business and development of own sites.

8 Abstract Efficient - secure ecological The construction is socially, ecologically and economically effective The wooden tower with a hub height of 100m saves ca. 300 tons of steel. The wood processing saves energy and the material binds 400 tons of CO 2 instead of releasing it. The cooperation with local players from the construction industry and forestry increases the acceptance of new wind energy plants. The wood solely comes from sustainable wood suppliers TIMBERTOWER exclusively uses wood from irreproachable origin. The certificates of the suppliers guarantee raw material from ecologically, economically and socially responsible forestry. Requirements to insurability, certification and fire protection are fulfilled Partners for cooperation are internationally active market leaders and experienced in production of wooden elements and surfaces. The company guarantees highest quality from development and production to completion of the wind energy plant and ensures a longer service life than steel towers. TIMBERTOWER safes resources and money.

9 Abstract The advantages in short Economically intelligent Long service Life, increased efficiency with higher hub heights, reduced project and reinstatement costs. Natural material Resource-saving, sustainable, avoidance of CO 2 -emissons. Easy transport Transport with conventional trucks, simple construction at almost any location of the world. Local added value Integration of regional suppliers, higher taxes for communities, higher acceptance of wind energy plants by the population.

10 Tower assembly

11 Tower assembly Foundation The foundation is supported by a spread or a deep foundation in relation to the nature of the substrate. The foundation in Marienwerder is a spread foundation and consists of a circular plinth mounted on a circular base plate. Mass and diameter of the foundation are identical to steel towers.

12 Tower assembly Foundation Ground level Ø 19m 4m 1m 1.6m Ventilation Converter Transformer Entrance 12

13 Tower assembly Falsework The TIMBERTOWER construction is done quickly and effectively. The so-called falsework is the core of the tower and contains the lift system and all electrical leads. It supports both tower erection and maintenance. The wooden panels are placed against the falsework. The octogonal cross-section gives the tower its characteristic form.

14 Tower assembly Falsework 6 segments, 15m high Ladder 24 platforms, Ø up to 7m No static relevance On-site assembly 3.75m Worklift

15 Tower assembly Wall elements Manufacturing The tower is made of cross laminated timber plates, which are prefabricated to 15m long and max. 3m wide panels including cut-outs for the perforated steel plates and surface protection. The wooden elements have a strength of 0.3m. 54 panels are needed for a TIMBERTOWER with 100m hub height.

16 Tower assembly Wall elements Composition Transversal lamella Longitudinal lamella

17 Tower assembly Wall elements Transport The transport of the wooden elements is possible with standard trucks, for example 10 trucks for a TIMBERTOWER with 100m hub height are required. Collaboration partners from Germany, Austria and Sweden produce the wooden elements.

18 Tower assembly Wall elements Coating The weather protection sheet is already glued to the surface of the wall elements with a excess at the production process. During the assembly of the tower the overlapping surface protection is welded to a whole closed body.

19 Tower assembly Wall elements Helix The helix is a curve that winds itself with a constant lead to a cylindrical surface. The weight of the wind turbine is solely supported through the wooden wall elements. There is little difference between the TIMBERTOWER and other conventional towers for wind energy plants. It is lean and tapers to the top: Base: 7m x 7m / tip: 2.4m x 2.4m. The 100m high tower has a total weight of 192t, a wood volume of 400m³ and a moisture of ca. 10%.

20 Tower assembly Steel adapter Circular flange for the connection to the nacelle Steel tube, wall thickness 18mm Octagonal flange for the connection to the tower Welded perforated steel plates

21 Details

22 Details Connection Foundation/Tower The connection between foundation and wall element is made by glued perforated steel plates which are welded to a base flange. Welded perforated steel plates at the anchor cage

23 Details Perforated steel plates

24 Monitoring

25 Monitoring Extreme loads Three strain gauges for measurement of shear stress on the inner side of the steel adapter. Strain gauges on perforated steel plates in the center of the horizontal joints at the height of 7.50 and 15m and on the perforated steel plates welded to the base flange. 36 anchor bolts with strain gauges at the anchor cage. Are not used for further analysis, due to pretensioning distorted the measured values.

26 Monitoring Fatigue loads Summary of the evaluation 1. Filter measurement errors 2. Filter out non extreme values 3. Rainflow counting method 4. Markov matrix with subsequent calculation of fatigue Mittelwert low 27, , , , , mid 27, , , , , low mid high 27, , , , , ,72E-06 0, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ingbreite a 0, , , , , , , , ,

27 Monitoring Calibration Resulting strain when rotating the gondola

28 Strain [10^-6] Monitoring Damping Decay curve after emergency stop (TimberTower) Decay curve after emergency stop (Steel tower) Time (s)

29 Monitoring Eigenfrequencies 0,06 Stahlturm Stahlturm 60 0,06 Amplitude [w.e.] 0,04 0,02 0,04 0,02 Amplitude [w.e.] Steel 0,00 0, f [Hz] f [Hz] 0,06 Holzturm 0 Holzturm 90 0,06 Amplitude [w.e.] 0,04 0,02 0,04 0,02 Amplitude [w.e.] Wood 0,00 0, f [Hz] f [Hz]

30 Monitoring Eigenmodes

31 Monitoring Storm Christian Standstill Operation Time [h] Wind direction Max. Windspeed: Max. Moment at towerbase: 31.8m/s knm 24 h Measuring Extrapolated to 20 Years Fatigue damage = 44%, if the tower would stand in a storm for 20 years

32 A look into the future

33 A look into the future New tower concepts Optimized assembly concepts New connection means 120m 140m 160m

34 A look into the future Wooden foundation

35 A look into the future Wooden foundation A pure wooden construction (tower and foundation) made of crosswise laminated spruce wood The hub height of the designed prototype is 100m (till now) The diameter at the tower bottom is 7m and 3m at the tip The weight of the total construction is 350t and about 700m³ wood are used The whole transport of the construction is possible with less than 20 standard trucks No heavy haulage is needed

36

37 TIMBERTOWER GMBH Vahrenwalder Straße Hannover

38

39 Questions/ Comments? This concludes the: American Institute of Architects Architectural Institute of British Columbia Engineering Institute of Canada Continuing Education Systems Program Wooden Towers for Wind Energy Plants TIMBERTOWER GmbH