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Conference programme 

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Poster session

Lead Session Chair:
Stephan Barth, Managing Director, ForWind - Center for Wind Energy Research, Germany
He Wei Statoil, Norway
Co-authors:
W. He (1) F P R. R. Yttervik (1) G. P. Olsen (1) I. Ostvik (2) L. Li (3) Z. Gao (3) C. Jimenez (4) T. Impelluso (5) J. Schouten (6) G. Bellotti (7)
(1) Statoil, Bergen, Norway (2) NorWind Installer, Bergen, Norway (3) Norwegian University of Science and Technology, Trondheim, Norway (4) EEWRC, The Cyprus Institute, Syprous, Cyprus (5) Bergen University College, Bergen, Norway (6) Deltares, Delft, The Netherlands (7) University of Rome 3, Rome, Italy

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Poster
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Presenter's biography

Biographies are supplied directly by presenters at OFFSHORE 2015 and are published here unedited

Dr. Wei He obtained her Ph.D at department of Mechanical Engineering, Delft University of Technology, the Netherlands.
Prior to this, Dr. He first worked for wind energy systems at DTU in Denmark in 1990 and then worked for the wind power integration into grid at KEMA in the Netherlands.
Dr. He is a principle engineer at Statoil, Norway, where she has worked for 15 years. She has applied offshore platform experiences to offshore wind technology, and has made several technological breakthroughs. Dr. He leads four EU funded collaborative wind energy research projects and several new idea programs at Statoil.

Abstract

A case study of multi-use platform: aquaculture in offshore wind farms

Introduction

Ever increasing marine construction and human activities in the European seas necessitate more judicious planning in the use of ocean space. This planning must consider multi-use of the ocean space to minimize environmental impacts. Within this understanding, the EU-funded research project “Innovative Multi-purpose off-shore platforms: planning, design and operation (MERMAID)” aims to integrate energy extraction and aquaculture activities in a multi-use platform (MUP). Two study cases at different water depths are presented to address the bottlenecks related to deployment and operational activities of MUPs. The innovative transport technologies are investigated to maximize the synergies and reduce the risks of MUPs.

Approach

In this work, the annual electricity yield of the offshore wind farm is estimated along with an integrated aquaculture production. The 1000 MW wind farm consists of 100 units of 10 MW wind turbine with two configurations: jacket foundation and floating sub-structure. The aquaculture unit will culture a multi-trophic ecosystem of fish, mussel and seaweed. A novel and expeditious method for the jacket foundation installation uses a new vessel with dynamic positioning capabilities. The feasibility is assessed by numerical simulations of the lifting jacket-foundation operation. The floating 10 MW wind turbine is fully assembled and towed to final operation site.

Main body of abstract

The MUP case study focused on four aspects: simulation of layouts, installation of 1000 MW wind farm, aquaculture activities and the synergies between activities.
First, two MUP layouts were considered: the jacket foundation at 40 m depth and the floating wind turbine at depth higher than 100m. An innovative hexagonal layout is presented for the floating wind turbines sharing the anchoring points at seabed. The two layouts require an area of 138 km² and 228 km². The large area contained within the wind farm has potential to create a high revenue aquaculture production, including salmon, mussel and seaweed.
The second aspect involves a more efficient installation of the 10 MW wind turbines. The installation of the 10 MW jacket foundation exploits a new vessel with dynamic positioning abilities, and consists of two distinct operations: pre-piling and jacket installation. The lifting operation of the jacket foundation has been simulated by using SIMO software (MARINTEK©) to evaluate technical feasibility. The 10 MW wind turbine is installed by a jack-up vessel with four lifts: lower tower; upper tower; nacelle and rotor. The fully assembled floating 10 MW wind turbine is towed to the final operation site.
The third aspect concerns the aquaculture systems. Those include the installation, operation and maintenance of the fish cages, blue mussel production line (drops) and seaweed production systems.
The final aspect focuses on the synergies of combining various deployments and operations of MUP to reduce cost and environmental impacts; wave energy converters are also discussed.


Conclusion

The two MUP layout analyses demonstrate that the aquaculture within wind farms has potential to produce significant annual yields of commercial species. The study case enables annual production of 60-70.000 tons of salmon and accounts for 50-60% of the electricity yield (at €4/kg). The synergies and the risks of the MUP integrated installation and operational technologies were identified. Based on the defined operational criteria and the simulated results of the jacket lifting operation, a workability analysis has been performed to identify sea conditions suitable for the installation process. In conclusion, the study cases present promising examples of future innovative MUPs.


Learning objectives
1. Integration the offshore wind farm with aquaculture farming
- Utilize the area / facilities within offshore wind farm
- Identify the synergies and disadvantages of the integration
2. Technology Innovations:
- Apply and integrate the offshore wind technologies to “lift” the aquaculture farming technologies