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Lunar Energy Copyright
The Rotech Tidal Turbine – Design DevelopmentInitial Concept
Designed with O&M foremost in mind
Removal of complex components and design
– No mechanical Gearboxes, yawing or variable pitch mechanisms
System bi-directional and duct straightens flow allowing for off-turbine axis flows
Gravity Base allows quick installation and little if any seabed preparation
No gearbox allows generation compartment to be hermetically sealed removing risk of leaks
Modular section (cassette) containing all working parts is easily removable and taken to shore for service
Lunar Energy Copyright
Atkins developed initial concept using Oil & Gas Design codes
Full stress and fatigue analysis
Base development including 3-point to contact to remove torsion.
Cheap Ballast (pre-installed) used to make up on-bottom weight needed to prevent sliding
Note the position of the modular ‘cassette’ (the magenta coloured centre unit)
The Rotech Tidal Turbine – Design DevelopmentAtkins (Mk I design)
Lunar Energy Copyright
Further development to make duct load bearing to remove tubular support frame
Over 20% costs reduction over initial design - steel requirement reduced and fabrication significantly cheaper
Base still gravity concept (not 3 mono-piles!)
Eloquent design allowing for significant local fabrication and handling
The Rotech Tidal Turbine – Design DevelopmentAtkins/Rotech MkII Design
Lunar Energy Copyright
Sir Robert McAlpine commissioned to develop commercial ideas and processes from first principles
Design remarkably similar to Atkins prototype design concept
The Rotech Tidal Turbine – Design DevelopmentSir Robert McAlpine Commercial (All Concrete) Design
Lunar Energy Copyright
The Rotech Tidal Turbine – Modular Cassette and Generating Pod
Modular unit (cassette) containing turbines, all hydraulics and generating equipment
removed quickly and taken to shore for service
replaced by another unit to minimise down time
Pod seals to prevent leaks and held at atmospheric pressure and temperature to enable components to operate in ‘design’ conditions
Lunar Energy Copyright
EMEC TIDAL TEST SITE
Lunar Energy Test Berth
Depth: 45 m (150 feet)
Flow Peak 7.2 knots (3.7 m/s)
Lunar Energy Copyright
Benefits of using the RTT Technology Environmentally sensitive Invisible from above the surface No impediment to shipping or other social activity No shoreline equipment required (except connection point) Environmental credentials proven at EMEC 07/08
EMEC has significant environmental considerations: Seal sanctuary and whale migration route
RTT has unique opportunity to mitigate issues through screening intake if necessary
RTT is below level of any surface ice and given the minimum 4 year cycle for maintenance, no service required during winter.
Lunar Energy Copyright
RTT and ALASKA
Current RTT design is ideally suited for the Alaskan operating environment
“Lunar Energy RTT - Only currently viable deepwater technology design”
Lunar Energy Copyright
Commercial Development
United Kingdom
2007 Sea trials of the EMEC 1MW unit
2008/9 Commissioning and fabrication of the first Commercial Units
2009/10 First demonstration field
2011/12 First development of first commercial field
International
2006 June 2006, Developer in New Zealand submitted resource consents application nominating the Lunar Energy RTT device for first commercial tidal stream project (200+MW).
2007 Negotiations ongoing for initial demonstration projects in Canada and in the US
2009 Installation and commissioning of projects in Canada; US; and New Zealand
2010/11 First developments of commercial fields outside UK