1 | Program Name or Ancillary Texteere.energy.gov Water Power Peer Review Aquantis 2.5 MW Ocean-Current Generation Device- AWP Alex Fleming: PI Dehlsen.

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1 | Program Name or Ancillary Texteere.energy.gov Water Power Peer Review Aquantis 2.5 MW Ocean-Current Generation Device- AWP Alex Fleming: PI Dehlsen Associates, LLC September 26,11

2 | Wind and Water Power Programeere.energy.gov Purpose, Objectives, & Integration Principal Objective of the Aquantis Project –Developing technology to harness the energy resource in the Gulf Stream Primary Challenges –Achieving an acceptable cost of energy –Understanding the resource impact on system performance –Designing a structure that withstands the large hydrodynamic loads –Designing a moored platform with static and dynamic stability –Designing a robust system with 20-year life –Developing a cost-effective installation and maintenance strategy –Determining effective computational and experimental tools –Understanding potential environmental impacts

3 | Wind and Water Power Programeere.energy.gov Technical Approach Key Issues and Methodology –Resource assessment Assess existing Gulf-Stream ADCP data Deploy instrumentation array to acquire better data –Turbine design Perform a comprehensive parametric conceptual design study Use NREL codes (HARP_Opt & WT_Perf) for hydrodynamic design Use computational fluid dynamics (CFD) to analyze the design Design the blades to best match the drivetrain (torque, rpm) Design the blade structure for large hydrodynamic loads –Evaluate composite materials, steels, and foams Design the blade-to-hub attachments Use finite-element analysis (FEA) to assess the structural designs Consider cost, manufacturing, weight, and buoyancy

4 | Wind and Water Power Programeere.energy.gov Technical Approach Key Issues and Methodology –Drive train design Evaluate direct drive, gear drive, and hydraulic drive Focus on robustness for 20-year life and limited maintenance Develop a bearing-and-seal package for the large loads –Stability, mooring, and anchoring Use unsteady CFD and a rotorcraft code to develop hydrodynamic coefficients Revise a proven Navy coefficient-based simulation tool for to assess platform stability (static and dynamic) Use Orcina marine dynamic analysis software (OrcaFlex) for mooring Determine installation and maintenance strategies –Cost-of-energy model Revise an existing model based on wind power Focus on capital and operational & maintenance (O&M) costs Base all system decisions on cost of energy

5 | Wind and Water Power Programeere.energy.gov Plan, Schedule, & Budget Schedule: Initiation date: 10/01/09 Planned completion date: 9/30/12 Contract Award - Effective Date 02/01/ date signed 02/22/2010. Total Contract Cost - $4,128,377 (DOE Funded Costs - $1,500,000; Dehlsen Associates matching funded costs - $2,628,377) – period of performance 02/01/2010 through 05/31/2012 Modification 001 – Effective Date 03/19/ date signed 04/09/2010 – removed NEPA provision 21 Modification 002 – date signed 07/08/2011 – provided incremental funding to fully fund the project; Milestones _Go/No-Go : Next Steps Budget: Budget History-AWP FY2010FY2011FY2012 DOECost-shareDOECost-shareDOECost-share $65,744$110,514$774,258$1,042,971$659,998$1,474,892 Siting Study for a Hydrokinetic Energy Project Located Offshore Southeast Florida Completion Status Summary of Tasks Task 1. Design & Analysis 25% Task 2. Mooring & Attachment 35% Task 3Enabling Technology Direct Drive 45% Task 4. Documentation20%

6 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Resource Assessment –Analyzed ADCP data acquired by Florida Atlantic University –Designed a new moored instrumentation array To be deployed late in 2011 at a Navy site adjacent to preferred Gulf Stream location

7 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Turbine Design –Completed a comprehensive parametric conceptual design study Varied rated power, diameter, blade number, blade chord, … Evaluated variable-speed and fixed-speed designs Evaluated various blade manufacturing and attachment concepts –Made critical design decisions: Use fixed-pitch blades (robustness) Design for variable speed (robustness, limited cavitation) –Do not use brakes during normal operation –Use passive depth control to limit loads Design for an existing hydraulic pump –Establish the rated power and diameter –Design for appropriate rpm Relative Velocities and Outer Streamline from CFD

8 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Turbine Design –Performed testing of expanded- plastic foams Do not use (too water absorbing) Use syntactic foams instead to achieve desired buoyancy –Developing two blade manufacturing concepts: Using steel spar, composite skin, and syntactic foam Using composite spar, composite skin, and syntactic foam –Developing a redundant blade-to- hub attachment Spanwise Strain in Composite Skin Using FEA

9 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Drive train Design –Eliminated direct drive to a permanent-magnet generator (excessive weight, volume, and cost) –Eliminated gear drive (potential maintenance issues) –Developing hydraulic-drive system Evaluating existing hydraulic pumps and motors Designing hydraulic lines, heat exchanger, generator, electronic system, instrumentation package, pressure vessel, braking system, connection to the grid … –Designing two bearing-and- seal packages: Oil-lubricated design with tapered roller bearings Seawater-film bearing with a flex coupling Pressure-Vessel Nacelle with Potential Blade Attachment, Seawater-Film Bearing, and Hydraulic Drive

10 | Wind and Water Power Programeere.energy.gov Accomplishments and Results Cost-of-Energy Model 6.45 cents/kWh cents/kWh

11 | Wind and Water Power Programeere.energy.gov Challenges to Date Challenge: designing the Aquantis system without full knowledge of the Gulf Stream resource—including extreme loads and knowledge of the seafloor properties –Mitigation Approach: acquire new and better resource data Challenge: designing the blades to achieve a 20-year life –Mitigation Approach: conduct risk-mitigation testing (and corresponding numerical analyses) for (1) material characterization, (2) spar structural integrity, (3) skin/spar assembly, and (4) spar-to-hub attachment assembly

12 | Wind and Water Power Programeere.energy.gov Challenges to Date Challenge: designing the turbine to increase the operational life of the hydraulic drive (in the absence of gear drive) –Mitigation Approach: Increase the turbine rpm and blade diameter (to overcome losses in the hydraulic drive) Challenge: designing the blades, the blade attachments, the wings (or trusses), and the bearing-and-seal package to withstand the larger loads (due to increased rpm, blade diameter, and number of turbines) –Mitigation Approach: Evaluate the cost and weight of the resulting structure with a smaller-load design and compare the cost of energy

13 | Wind and Water Power Programeere.energy.gov Next Steps Q1Q2Q3Q4 Q1 Q Q3Q Q1Q2 Q3Q4 Conceptual Design (5/5/11) Detailed Design Finalize Configuration (09/15/11) Tow Tank Test of 1:20 scale (03/15/12) Build 1:20 model At sea Test of 1/20 scale (2/21/13) Build Full Scale Turbine At sea full scale test (3/15/14) TR1 TR2 TR3TR4 TR5 TR8TR9TR6TR7 PDR (10/18/11) (x/x/x) CDR (10/15/12) Full Scale Drive Train Test (11/15/12)