The centrepiece of the NEMOS wave energy converter, the mechanical-electrical energy conversion unit, has been manufactured in large-scale. After several years of development work and scale testing, this innovative power take-off unit has been realized with full dimensions. Before its deployment in the first plant in the North Sea next year, the engineers of NEMOS will gather experience and conduct numerous tests with the impressive rig weighing 40 tons in total.
After successful implementation in scaled field tests, the anchor systems of the NEMOS device are subject to extensive laboratory studies. The screw anchors offer exceptional high holding capacities at low mass and can be installed with minimum noise emission. Cyclic loads expected in real operation are simulated in endurance tests, feeding empirical models for dimensioning the anchors of the large-scale device.
A floating service-platform has been prepared for different kinds of work at the NEMOS-Prototype. After successful assembly it is now located in the harbour of Hanstholm (Denmark) ready for anchor-pulling tests and installation works. Due to a specifically developed lift frame, anchors and construction parts of 25 tons can be lifted as well as lowered to the seabed.
Parallel to the endurance-test of the 1:5-device at Nissum Bredning first components of the full-scale-Prototype are investigated on various test benches. Belts and gear shafts as well as ropes are tested under full operating loads. To simulate realistic conditions the ropes were sprinkled with saltwater and have already been moved millions of cycles over pulleys with various fibres and coatings. The tests are realised in cooperation with Liros GmbH at the “IFT”-Institute of the University of Stuttgart within the joint research project funded by the Federal Ministry for Economic Affairs and Energy.
Within only a few months the NEMOS-Team has designed and realised an innovative test-bench for investigating belts. It allows testing the belts of the 1:1 wave energy converter under their full expected load. Due to a novel setup it is possible to run 200,000 bending cycles a day under extreme forces. This means that it tests 10 times faster than it will be the case during application at sea.
Since the beginning of this week the NEMOS 1:5 test device at Nissum Bredning in Denmark started the fully automated operation. With an advanced developed operation`s software and a - concerning liability and efficiency - optimised hardware the device already feeds in electricity into the danish grid.
Within the EU-Project MARINET a test series has been conducted at the ECN in Nantes. This wave tank, one of the biggest worldwide, enables tests with the 1:5 scaled NEMOS-device. Due to the precise adjustments and reproducibility of the wave conditions, extensive hydromechanical parameter studies were carried out. The results of the more than 200 realised tests will be integrated in the automation of the system during the upcoming field tests and the full-scale device.
The test of a 1:5 scaled prototype which took place at Danish Limfjord from July to October has successfully been finished. The new tower, the automatisation of the system and all components of the rope kinematic system proved to be robust and reliable. Particularly noteworthy is the verification of the PTO efficiency of up to 80%, unique in wave energy!
This week NEMOS presented at the "WindEnergy" fair in Hamburg to a broad public and many experts. The innovative technology of the NEMOS device met a remarkable interest within the sector.
Since July this year, a full-fledged NEMOS plant produces electrical energy at the coast of the Danish Nissum Bredning. It includes the functions of a later series system and serves us to further test for the system automation, the reliability of the components and to optimize control parameters.
After intensive investigations, a novel concept has been developed with which the mechanical energy of the floating body can be very efficiently converted into electrical energy. This concept allows the implementation of complex force profiles with an efficiency of around 80%. The concept has been implemented and confirmed its potential in practical tests. Two patents have been registered.
In various cities of the region, the first "WissensNacht Ruhr" will take place on 2nd of October. NEMOS will be part of it and cordially invites everybody to visit us at the Tectrum in Duisburg. For more information regarding the whole event please click here: http://www.wissensnacht.ruhr/home/
Last week a camera team of WDR TV station visited us for a shooting about successful start-up companies. The resulted footage was broadcasted on 13th of January within "Lokalzeit".
Beside the analysis of the test results, the construction material of the hardware is actually examined in the laboratory at the University of Amberg. At the same time, first plannings regarding the development of the prototype already take place. Thereby, the focus is directed on the conceptual design of the Power Take Off to realize an economically efficient energy conversion up to the network supply.
We are pleased to announce that the five months lasting test of the 1:10 NEMOS-wave energy converter was finished successfully. The specifically developed components have proved to be durable and the efficiency of more than 50 % gives a positive prospect towards the full scale device. The results show that the enormous effort of the NEMOS-team during the last intensive months was worthwhile.
With rising temperatures during the summer, the natural underwater growth at the 1:10-test system increased enormously. Thereby, the applied protective mechanisms have proved themselves, so that the functionality of the components persisted as expected without any restrictions. In addition, material samples exposed near the wave energy converter five months ago provide first findings regarding their chemical resistance.
During the European Wave and Tidal Energy Conference, held in Aalborg (DK), Jan Peckolt presented the NEMOS-project and gave some insights into the current field-tests at Nissum Bredning. EWTEC ist the world`s most important conference of the sector that registered more than 500 participants from 28 countries this year.
At the end of the month, the NEMOS-Team staying at the danish test site was accompanied and filmed during various working steps by a professionell camera crew. The resulted film footage as well as also conducted interviews will be compiled in a documentation about innovative technologies. The date of the broadcast will be announced in due time.
With a further installation in the danish test site, the foundations are investigated. For this purpose, screw anchors get installed and loaded. In these tests, the anchor-system showed a high bearing capacity and can be evaluated as cost-efficient and reliable. Nevertheless, comprehensive works regarding the real construction, certification and installation are still need to be done.
To analyse the components of the system, special tests are executed currently. Therefore, the ropes and the pulleys are exposed to enormous alternating loads at a test bench on the sea ground. Until now, no noteworthy sign of wear can be noticed. Beginning in September, a detailed analysis of the components will take place in cooperation with the industry partners.
During a distinctive storm, the converter has been confronted with its first endurance test. With waves up to 0.8 m of height, which with regard to the scale would be eight meters, all components remained undamaged. Thereby the converter has been successfully tested during normal operation as well as in safety mode, whereby the body gets plunged into deeper water with less movement.
Already within the first days it could have been noticed that the converter shows the desired kinesic behaviour. With varied directions and frequencies it corresponds to the prognosis of the laboratory tests. Also the specifically developed software for the operational control seems to prove itself. What already has been tested are the algorithms for the trajectory`s alignement with the wave direction and the water-level as well as the comprehensive safety concept.
After the tailoring of the ropes and the calibration of the measurement-sensors, first tests have been effected. At the end of this week continous West winds are expected, so that the tests begin as planned. In rotation, teams of at least three employees will serve the facility until August. Beside parameter studies, the aim is to gain conclusions regarding the output under real environmental conditions and the testing of the components in long-termed operation.
The anchors have been screwed in with a long installation assistance, while two divers controlled the process on the sea ground. Thereby it has been showed that the measurement of the anchors as well as the structural design of the installation tools have been chosen rightly. Afterwards, the pulleys have been installed. These are tared upwelling-neutral so that the divers could assemble them "levitating" at the anchors.
The NEMOS-converter has been installed directly in front of the almost 200 meter long footbridge so that the generator- and control system as well as the whole measurement instrumentation are positioned protected in the container of the test site. The works started with the construction of a floating platform from which the installation has been effected. After mensuration of the location the anchoring could have been executed already on the third day.
After intense preparation, a delegation of five NEMOS-Team members arrived at the danish test site on 13th of May, equipped with the 1:10 scaled converter as well as various new developped devices which will be tested for their operation in the 1:1 converter. Part of these are innovative pulleys, different kinds of floating bodies and screw anchors with specifically devised floor panels.
The GreenTec Awards offer a medial platform for innovative products and projects aimed to preserve natural resources which show that sustainability does not stand in contradiction to economical interests. In this context, NEMOS is nominated in the category „Energy“. Until the 10th of May you can vote here for the best projects:
Scaled 1:20, extensive tests regarding the operation and control mechanism of the system have been carried out. With particular modifications the assembled experimental setup will be applied also within the 1:10 scaled natural tests in Denmark in May. For this purpose the preparations are running high-speeded with a team of meanwhile 12 men and women.
To prepare the upcoming test series in danish Limfjord, a delegation of NEMOS visited the Testcenter. Together with the responsable operator, Prof. Frigaard from the Aalborg University, issues regarding the infrastructure have been resolved and technical information was exchanged. On the way back there was the opportunity to visit the prototype of the danish wave energy device Wavestar at the harbour of Hanstholm.
From today on various tests with the new scaled prototype will be carried out in the wave tank. Thereby an important step regarding the tests at the Danish North Sea has been done. Within the next weeks two further modules will be completed, so that parameter studies for the regulation and the operating control can be effected with the whole system.
To prove different configurations and parameters of the Power-Take-Off system a simulation of the rope kinematics has been built up. Beside the electrical conversion of energy all influences of inertia and friction are indicated as well as a simplified hydromecanics model. "With low effort we thereby receive valuable conclusions regarding the regulation of the real system", says the simulation expert Philip Eder, who leads this part of the project. "Now over-night calculations are started which can prove and optimize several hundreds of different configurations."
Enormously interested, the Federal Environment Minister Peter Altmaier has been introduced to the NEMOS technology. Together with the Executive Chairman of ThyssenKrupp AG, Dr.-Ing. Heinrich Hiesinger, he visited the NEMOS demonstration model during the exhibition "IdeenPark" in Essen.
During a ceremonious event the SPD faction leader, Dr. Frank-Walter Steinmeier, handed over the award "Elected place 2012 in the Land of ideas".