WAVESAX RSE2, addressed to test an innovative device to transform wave power into electric energy in ports and harbours

Transcription

1 Marine Renewables Infrastructure Network Infrastructure Access Report Infrastructure: ECN Hydrodynamic and Ocean Engineering Tank User-Project: WAVESAX RSE2 WAVESAX RSE2, addressed to test an innovative device to transform wave power into electric energy in ports and harbours Maximo Peviani *, Andrea Danelli *, Giordano Agate *, Sylvain Bourdier ** * RSE Research on Energy Systems, ** LHEEA - Ecole Centrale de Nantes Status: Draft Version: 01 Date: 04-Sep-2015 EC FP7 Capacities Specific Programme Research Infrastructure Action

2 ABOUT MARINET MARINET (Marine Renewables Infrastructure Network for emerging Energy Technologies) is an EC-funded network of research centres and organisations that are working together to accelerate the development of marine renewable energy - wave, tidal & offshore-wind. The initiative is funded through the EC's Seventh Framework Programme (FP7) and runs for four years until The network of 29 partners with 42 specialist marine research facilities is spread across 11 EU countries and 1 International Cooperation Partner Country (Brazil). MARINET offers periods of free-of-charge access to test facilities at a range of world-class research centres. Companies and research groups can avail of this Transnational Access (TA) to test devices at any scale in areas such as wave energy, tidal energy, offshore-wind energy and environmental data or to conduct tests on cross-cutting areas such as power take-off systems, grid integration, materials or moorings. In total, over 700 weeks of access is available to an estimated 300 projects and 800 external users, with at least four calls for access applications over the 4-year initiative. MARINET partners are also working to implement common standards for testing in order to streamline the development process, conducting research to improve testing capabilities across the network, providing training at various facilities in the network in order to enhance personnel expertise and organising industry networking events in order to facilitate partnerships and knowledge exchange. The aim of the initiative is to streamline the capabilities of test infrastructures in order to enhance their impact and accelerate the commercialisation of marine renewable energy. See for more details. Partners Ireland University College Cork, HMRC (UCC_HMRC) Coordinator Sustainable Energy Authority of Ireland (SEAI_OEDU) Denmark Aalborg Universitet (AAU) Danmarks Tekniske Universitet (RISOE) France Ecole Centrale de Nantes (ECN) Institut Français de Recherche Pour l'exploitation de la Mer (IFREMER) United Kingdom National Renewable Energy Centre Ltd. (NAREC) The University of Exeter (UNEXE) European Marine Energy Centre Ltd. (EMEC) University of Strathclyde (UNI_STRATH) The University of Edinburgh (UEDIN) Queen s University Belfast (QUB) Plymouth University(PU) Spain Ente Vasco de la Energía (EVE) Tecnalia Research & Innovation Foundation (TECNALIA) Netherlands Stichting Tidal Testing Centre (TTC) Stichting Energieonderzoek Centrum Nederland (ECNeth) Germany Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V (Fh_IWES) Gottfried Wilhelm Leibniz Universität Hannover (LUH) Universitaet Stuttgart (USTUTT) Portugal Wave Energy Centre Centro de Energia das Ondas (WavEC) Italy Università degli Studi di Firenze (UNIFI-CRIACIV) Università degli Studi di Firenze (UNIFI-PIN) Università degli Studi della Tuscia (UNI_TUS) Consiglio Nazionale delle Ricerche (CNR-INSEAN) Brazil Instituto de Pesquisas Tecnológicas do Estado de São Paulo S.A. (IPT) Norway Sintef Energi AS (SINTEF) Norges Teknisk-Naturvitenskapelige Universitet (NTNU) Belgium 1-Tech (1_TECH) Page 2 of 25

3 DOCUMENT INFORMATION Title Distribution Document Reference User-Group Leader, Lead Author User-Group Members, Contributing Authors Infrastructure Access Report: WAVESAX RSE2 WAVESAX RSE2, addressed to test an innovative device to transform wave power into electric energy in ports and harbours Public MARINET-TA1-WAVESAX RSE2 Maximo Aurelio Peviani RSE Research on Energy Systems Andrea Danelli RSE Research on Energy Systems Giordano Agate RSE Research on Energy Systems Sylvain Bourdier LHEEA_ECN Infrastructure Accessed: Infrastructure Manager (or Main Contact) ECN Hydrodynamic and Ocean Engineering Tank Pierre-Emmanuel Guillerm REVISION HISTORY Rev. Date Description Prepared by (Name) Approved By Infrastructure Manager Status (Draft/Final) First Draft A. Danelli M. Peviani Draft Page 3 of 25

4 ABOUT THIS REPORT Infrastructure Access Report: WAVESAX RSE2 One of the requirements of the EC in enabling a user group to benefit from free-of-charge access to an infrastructure is that the user group must be entitled to disseminate the foreground (information and results) that they have generated under the project in order to progress the state-of-the-art of the sector. Notwithstanding this, the EC also state that dissemination activities shall be compatible with the protection of intellectual property rights, confidentiality obligations and the legitimate interests of the owner(s) of the foreground. The aim of this report is therefore to meet the first requirement of publicly disseminating the knowledge generated through this MARINET infrastructure access project in an accessible format in order to: progress the state-of-the-art publicise resulting progress made for the technology/industry provide evidence of progress made along the Structured Development Plan provide due diligence material for potential future investment and financing share lessons learned avoid potential future replication by others provide opportunities for future collaboration etc. In some cases, the user group may wish to protect some of this information which they deem commercially sensitive, and so may choose to present results in a normalised (non-dimensional) format or withhold certain design data this is acceptable and allowed for in the second requirement outlined above. ACKNOWLEDGEMENT The work described in this publication has received support from MARINET, a European Community - Research Infrastructure Action under the FP7 Capacities Specific Programme. LEGAL DISCLAIMER The views expressed, and responsibility for the content of this publication, lie solely with the authors. The European Commission is not liable for any use that may be made of the information contained herein. This work may rely on data from sources external to the MARINET project Consortium. Members of the Consortium do not accept liability for loss or damage suffered by any third party as a result of errors or inaccuracies in such data. The information in this document is provided as is and no guarantee or warranty is given that the information is fit for any particular purpose. The user thereof uses the information at its sole risk and neither the European Commission nor any member of the MARINET Consortium is liable for any use that may be made of the information. Page 4 of 25

5 EXECUTIVE SUMMARY The WAVESAX RSE2 is the updated version of the WAVETUBE RSE1 device tested at the ocean wave basin of the HMRC (Cork, Ireland). Basically, the shape of the entrance, the orientation and submergence of the device have been optimized. In those tests, the presence of the turbine blades has been taken into account approximately, by introducing a membrane with different free surfaces in the working cross section. Although, the theoretical background and the practical feasibility of the Wells turbine have been already analysed with numerical modelling, no laboratory testing has been performed yet. Therefore, the objective of the present (1:5) study in the LHEEA-ECN ocean tank was to perform the Stage 2 Design Validation [TR 4]: (a) Performance Verification in Realistic Seaways; and (b) Component, Power Take-Off & Control Monitoring. In particular, the present access aimed to analyse the behaviour of the device, including two turbine configurations (scale 1:5), with regular and irregular wave conditions in the ocean wave tank. The model and the wave basin were equipped with a series of sensors which allowed to measure the following parameters during the tests: pressure in different points inside the device, the free surface displacement inside and outside the device, the rotational velocity and the torque at the top of the axis. The tests had the objective to optimize the device design, especially as far as the rotor is concern. In particular, two types of Wells turbine configurations (with three and four blades) have been tested. During the first experiments, a total of 10 different regular waves were used to test the device performance, with a wave high of between 1 and 3 meters (20 cm and 60 cm in the wave tank); afterwards, some tests have been carried out using irregular waves, with an energy distribution that follows the Jonswap spectra. Furthermore, starting from the measurements of the axis rotational speed and the torque, it was possible to calculate the power at the axis. The studies of this stage will be also interfaced with numerical simulations (RANS-CFD model) of the device under the same wave conditions. The medium-term objective is to test the device in real Mediterranean sea conditions at the Port of Civitavecchia (Lazio Region, Italy), leading the Stage 3: Sub-Systems Model [TR 5-6]. From left to right: LHEEA-ECN ocean wave basin under regular wave conditions; details of the WAVESAX RSE2 model (scale 1:5); installation of the device and sensors on the ocean tank bridge. Page 5 of 25

6 CONTENTS 1 INTRODUCTION & BACKGROUND INTRODUCTION DEVELOPMENT SO FAR Stage Gate Progress Plan For This Access OUTLINE OF WORK CARRIED OUT SETUP TESTS Test Plan RESULTS ANALYSIS & CONCLUSIONS MAIN LEARNING OUTCOMES PROGRESS MADE Progress Made: For This User-Group or Technology Progress Made: For Marine Renewable Energy Industry KEY LESSONS LEARNED FURTHER INFORMATION SCIENTIFIC PUBLICATIONS WEBSITE & SOCIAL MEDIA REFERENCES APPENDICES STAGE DEVELOPMENT SUMMARY TABLE Page 6 of 25

7 1 INTRODUCTION & BACKGROUND Infrastructure Access Report: WAVESAX RSE2 1.1 INTRODUCTION The WAVESAX RSE2 is the updated version of the WAVETUBE RSE1 device tested at the ocean wave basin of the HMRC (Cork, Ireland). Basically, the shape of the entrance, the orientation and submergence of the device have been optimized. In those tests, the presence of the turbine blades - and the consequent PTO damping - has been taken into account approximately, by introducing a membrane with different free surfaces in the working cross section. Although, the theoretical background and the practical feasibility of the Wells turbine have been already analysed with numerical modelling, no laboratory testing has been performed yet. Therefore, the objective of the present (1:5) study in the LHEEA-ECN ocean tank is to perform the Stage 2 Design Model [TR 4] (a) Performance Verification in Realistic Seaways; and (b) Component, Power Take-Off & Control Monitoring. Computational fluid dynamics analysis, of the fixed component and the turbine, has been performed using a RANS- CFD model and considering four regular wave conditions, representative of the wave climate in the Port of Civitavecchia (Tyrrhenian cost, Italy) where the device is intended to be tested in the future. The numerical results permitted to estimate the yearly available energy along the working section of the device, as a function of the cut-in velocity. The present access aims to evaluate the performance of different turbine configurations. The medium-term objective is to test the device in real Mediterranean sea conditions at the Port of Civitavecchia (Lazio Region, Italy), leading the Stage 3: Sub-Systems Model [TR 5-6]. Considering that the WAVESAX RSE2 device is meant flexible enough to be installed in a large number of ports, the long-term objectives are to improve the design of the device, both with scale and numerical models, under different Mediterranean wave conditions. 1.2 DEVELOPMENT SO FAR Computational fluid dynamics analysis, of the fixed component of the device, has been performed using a RANS-CFD model and considering four regular wave conditions, representative of the wave climate in the Port of Civitavecchia (Tyrrhenian cost, Italy) where the device can be tested in the near future. The numerical results permitted to estimate the yearly available energy along the working section of the device. This value represents a preliminary (and overestimated) quantification of the producible energy. In addition, the numerical analysis allowed quantifying the available energy as a function of the cut-in velocity, which represents a threshold for the fluid velocity, under which no energy is actually produced. Finally, the computation fluid dynamics of two different configurations of Wells turbines, using a RANS-CFD model, permitted to have an inside about the PTO, and the correlated angular velocity of power conversion capability of the device along one wave period. These values were very useful for the elaboration of the test plan in the ECN ocean tank, and the selection of the measuring instruments, as well Stage Gate Progress Previously completed: Planned for this project: STAGE GATE CRITERIA Stage 1 Concept Validation Linear monochromatic waves to validate or calibrate numerical models of the system ( waves) Finite monochromatic waves to include higher order effects ( waves) Hull(s) sea worthiness in real seas (scaled duration at 3 hours) Restricted degrees of freedom (DofF) if required by the early mathematical models Provide the empirical hydrodynamic co-efficient associated with the device (for mathematical modelling tuning) Status Page 7 of 25

8 STAGE GATE CRITERIA Investigate physical process governing device response. May not be well defined theoretically or numerically solvable Real seaway productivity (scaled duration at minutes) Initially 2-D (flume) test programme Short crested seas need only be run at this early stage if the devices anticipated performance would be significantly affected by them Evidence of the device seaworthiness Initial indication of the full system load regimes Stage 2 Design Validation Accurately simulated PTO characteristics Performance in real seaways (long and short crested) Survival loading and extreme motion behaviour. Active damping control (may be deferred to Stage 3) Device design changes and modifications Mooring arrangements and effects on motion Data for proposed PTO design and bench testing (Stage 3) Engineering Design (Prototype), feasibility and costing Site Review for Stage 3 and Stage 4 deployments Over topping rates Stage 3 Sub-Systems Validation To investigate physical properties not well scaled & validate performance figures To employ a realistic/actual PTO and generating system & develop control strategies To qualify environmental factors (i.e. the device on the environment and vice versa) e.g. marine growth, corrosion, windage and current drag To validate electrical supply quality and power electronic requirements. To quantify survival conditions, mooring behaviour and hull seaworthiness Manufacturing, deployment, recovery and O&M (component reliability) Project planning and management, including licensing, certification, insurance etc. Stage 4 Solo Device Validation Hull seaworthiness and survival strategies Mooring and cable connection issues, including failure modes PTO performance and reliability Component and assembly longevity Electricity supply quality (absorbed/pneumatic power-converted/electrical power) Application in local wave climate conditions Project management, manufacturing, deployment, recovery, etc. Service, maintenance and operational experience [O&M] Accepted EIA Stage 5 Multi-Device Demonstration Economic Feasibility/Profitability Multiple units performance Device array interactions Power supply interaction & quality Status Page 8 of 25

9 STAGE GATE CRITERIA Environmental impact issues Full technical and economic due diligence Compliance of all operations with existing legal requirements Status Plan For This Access The WAVESAX RSE2 device has been conceived to be installed in ports and harbours, in the Mediterranean sea. Therefore, two aspects are quite important: flexibility of the device to fit in different structural configurations and replication in a large number of units. In the previous Stage 1 analysis the following issues have been considered: effective functionality of the device conception and optimization of its design in terms of velocity gradients in the section where the turbine blades are installed, under regular and irregular wave conditions. In the present Stage 2 Sub-system assessment [TR4] analysis the main issue is to analyse the behaviour of the device, including two turbine configurations (scale 1:5), with regular and irregular wave conditions in the ocean wave tank. The studies of this stage will be also interfaced with numerical simulations (RANS-CFD model) of the device under the same wave conditions. From the results of the Access, two additional objectives are foreseen: a) Short-term objective: if the results of the PTO from both studies will give promising results, the WAVESAX RSE2 device will be proposed for the next Stage 3 Sub-System Model [TRL 5-6], both (a) Fully Operational Converter Sea Trials and (b) Evaluate Energy Production in Real Seaways (scale 1:1). b) Medium-term objectives: to test the device in real sea conditions. There are already two potential sites at the Port of Civitavecchia (Lazio Region, Italy) in which the WAVESAX RSE2 device can be installed and tested (Stage 4: Solo Device Proving [TR 7-8]. 2 OUTLINE OF WORK CARRIED OUT Figure 2.1 WAVESAX RSE2 model layout(left), building and assembling (right) Page 9 of 25

10 2.1 SETUP Infrastructure Access Report: WAVESAX RSE2 The model and the wave basin are equipped with a series of sensors which are able to continuously monitor the performance of the device. The instrumentation that have been used are the following: pressure sensors attached directly on the device: four for the turbine section and one at the device mouth (see Figure 2.1), provided by RSE; four wave probes: one inside the device (see Figure 2.1) and three on the left side of the device (positioned 1 m in front, 1 m back and in coincidence with the axis of the device), supplied by ECN; a torque-meter: for measuring the torque values in continuous during the tests, located at the upper part of the axis (see Figure 2.1), supplied by ECN; an anemometer to dampen the axis rotational speed and positioned above the torque-meter, provided by RSE. a rotational velocity meter: for measuring the angular speed during the tests, located top-end of the axis (see Figure 2.1), supplied by ECN; voltage-meter and ampere-meter: for measuring the tension and the intensity of the electrical motor, provided by RSE. Figure 2.2 Installation of sensors for continuous performance monitoring (left) and general overview of the device (right) For documentation purposes, both video and photography equipment have been installed at the basin, as well. The device setup in laboratory was performed by both the RSE and LHEEA-ECN personnel. The setup mainly consisted on the following operations: mounting and testing the device components (turbines, inertia rotor, electric motor, damper, etc.); positioning and installation of the device on the bridge at the centre of the basin; calibration and connection of the pressure sensors into the device; positioning and testing the wave probes; installation of the torque-meter, rotational velocity meter and damper on the device; calibration of the torque-meter; calibration of the rotational velocity meter. Page 10 of 25

11 2.2 TESTS The WAVESAX RSE2 (1:5) model was tested at the ocean tank of the LHEEA Ecole Central de Nantes (Nantes, France) with the aim of analysing the behaviour of the device, including two different Wells turbine configurations and related submergence depths. The test have been performed under regular and panchromatic wave conditions. Figure 2.3 Installation of sensors for continuous performance monitoring (left) and general overview of the device (right) The following parameters have been measured during the tests: pressure at the 5 points [A, B, C, D and E], the free surface displacement at the point [F], the rotational velocity and the torque at the axis G of the device, as it is reported in Fig 2.3 (left). In particular: [A] at the entrance of the device, [B, C, D and E] before and after the working cross section where the turbine blades are installed, [F] the water surface variation inside the device, [G] the axis of the turbine. An additional point [H] is measuring the outside wave conditions. The tests carried out at the ocean wave basin, had the objective to optimize the device design, especially as far as the rotor is concern. In particular, two types of Wells turbine configurations (with three and four blades) have been tested. Wave experiments During the first runs, a total of 10 different regular waves were used to test the device performance, with a wave high of between 1 and 3 meters (20 cm and 60 cm in the wave tank), as it is reported in the following Table 2.2. Page 11 of 25

12 Wave Identifier Hs (m) A (m) Period (s) Hs model (cm) A model (cm) Period model (s) Frequency model (1/s) Name sea file H20T H20T H20T H30T H30T H30T H40T H40T H60T H60T358 Table 2.1 Wave conditions simulated in the ocean tank In addition, some tests have been carried out using irregular waves (see Errore. L'origine riferimento non è stata trovata.), with an energy distribution that follows the Jonswap spectra, as it is reported in the following Table 2.3. Case Hs (wave height) Tp (Peak period) α (alfa) ϒ (gamma) Ϭa (sigma a) Ϭb (sigma b) ,016 3,3 0,07 0, ,016 3,3 0,07 0, ,8 0,013 3,3 0,07 0, Test Plan Table 2.2 Jonswap parameters for the irregular waves considered in the ocean tank The tests have been performed using one access period. Due to the National day in France on the 14 th of July and some additional time needed for the construction of the rotational velocity sensor, the end of the tests have been postponed of two days (from July 13 th to the 22 nd of July 2015). In addition, on the 9 th and 10 th of July the model was assembled with the involvement of the RSE staff. The RSE Staff has arrived at ECN laboratory on the 9 th July, in order to assemble and test the device components (turbines, inertia rotor, electric motor, damper, etc.) outside the ocean tank. The setup of the model took a lot of effort and was time consuming, due to the complexity in the installation of a sequence of instruments on the top of the axis (inertia rotor, torque-meter, rotational velocity meter and damper). Therefore, the device tests have been performed on the 20 th and 21 st of July. Finally, the model was removed from the ocean tank on the 22 nd of July. The Errore. L'origine riferimento non è stata trovata. summarizes all the tests performed, taking into account the following elements: TURBINE: turbine configuration with three and four blades; DEPTH: depth of the work section respect to the free surface; HS MODEL: wave height (cm) generated in the basin; T MODEL: wave period (s) generated in the basin; Page 12 of 25

13 WAVE: regular or irregular wave climate generated in the basin; INERTIA: amount of inertia added in the rotor; DAMPING: type and amount of damping added to the rotor. Infrastructure Access Report: WAVESAX RSE2 DATE TEST NUMBER TURBINE HS MODEL (cm) T MODEL (S) WAVE INERTIA DAMPING 20/07/ regular No 20/07/ regular No 20/07/ regular No 20/07/ regular No 20/07/ regular No 20/07/ regular No 20/07/ regular No 20/07/ regular Yes (20 20/07/ regular Yes (20 20/07/ IRR Yes (20 20/07/ IRR No 20/07/ IRR no + 20 washers 20/07/ regular No 20/07/ regular no 20/07/ regular Yes (20 20/07/ regular Yes (20 21/07/ regular Yes (20 21/07/ regular no 21/07/ regular no 21/07/ regular no 21/07/ regular no 21/07/ regular no Page 13 of 25

14 21/07/ IRR no 21/07/ regular no 21/07/ regular no 21/07/ regular 21/07/ regular 21/07/ IRR 21/07/ IRR 21/07/ regular 21/07/ regular 21/07/ IRR 21/07/ regular 21/07/ regular 21/07/ regular 21/07/ regular 21/07/ regular 21/07/ regular 21/07/ regular no 21/07/ regular no 21/07/ regular no 21/07/ regular 21/07/ regular 21/07/ regular 21/07/ regular no 21/07/ regular no Table 2.4 Performed tests BORDER CENTER CENTER MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE Page 14 of 25

15 2.3 RESULTS Infrastructure Access Report: WAVESAX RSE2 During the test illustrated in Errore. L'origine riferimento non è stata trovata., several measurement have been taken to evaluate the performance of the device, such as: water level inside and outside the device; pressure inside the device in correspondence to the entrance and the working section (before and after) of the turbine (see Figure 2.1); the rotational velocity of the rotor; the torque in the axis. Starting from these data, it was possible to calculate the velocities inside the device, the pressure variation through the working section and the power on the axis. It lead to the evaluation of the Response Amplitude Operator (RAO) and finally the available energy in the axis (PTO). This section briefly illustrates the results obtained in the Test 25, characterized by a regular wave with Hs=40 cm and T=3.13 s (corresponding to Hs=2m and T=7 s in the prototype). In particular, starting from the measurements of the axis rotational speed and the torque, it was possible to calculate the power at the axis (PTO). Hereinafter, we report the following parameters: Water level outside the device (Hs); The axis rotational speed; The torque; The calculated power at the axis. Figure 2.2 Water level measured with the wave probe, positioned in front of the device Page 15 of 25

16 Figure 2.3 Axis rotational speed during the entire test period Figure 2.4 Torque measured during the entire test period Page 16 of 25

17 Figure 2.5 Calculation of the instantaneous power generated in the rotor of the model Figure 2.6 Calculation of the instantaneous power scaled to the prototype The following Figure 2.7 reports the Hs measured outside the device. As it is possible to observe, the first three incident waves (t<46 seconds) should be discarded because the tank have not yet reached an equilibrium stage (test with regular waves). Indeed, we focused the attention on the reference period (46.8 s < t < 59.5 s), as it is reported in the Figure 2.9. Page 17 of 25

18 Figure 2.7 Water level measured with the wave probe in front of the device and selected reference period Figure 2.8 Water level measured in front of the device during the reference period Page 18 of 25

19 Figure 2.9 Axis rotational speed during the reference period Figure 2.10 Torque measured during the reference period Page 19 of 25

20 Figure 2.11 Calculation of the instantaneous power for the model during the reference period Figure 2.12 Instantaneous power scaled to the prototype Furthermore, to evaluate the performance of the device we calculated the efficiency L (capture length), as the ratio between the available power P and the absorbed power J: In which the available power is calculated by the following formula: Page 20 of 25

21 As mentioned before, the test 25 is characterized by Hs = 2m and Tp =7 s, this means that the mean available power P is W/m, and considering that the device captures the energy from a wavefront of 1 m, the available power is actually W. From the estimation of the absorbed power J (equal to 450 W, mean value during the oscillation of 1 single wave), it was possible to calculate the capture length L = ANALYSIS & CONCLUSIONS First of all, to work at the LHEEA - ECN Ocean Engineering Tank receiving the support from their professional staff has been an outstanding experience for all the user-group team. The installation of the scale model and monitoring sensors, measuring testing and basin start-up, have been perfectly done, allowing to have a successful performance along the entire testing period. The behaviour of the device has been satisfactory, both in terms of response to incident wave conditions and quality of the measured data, with particular concern to the available power in the rotor. Essential information on key parameters has been clearly understood, such as the turbine performance for different regular wave conditions, the response to irregular waves climate, cut-in velocity, limitations and efficiency of the device, as well. The results from the ocean tank experiments certainly lead to a quite important step forward in the development of the WAVESAX RSE2 device, to be analysed in the next Stage 3 System Validation (TRL5-TRL6). 3 MAIN LEARNING OUTCOMES 3.1 PROGRESS MADE Progress Made: For This User-Group or Technology The main progress made in the WAVESAX RSE2 development is the confirmation of a successful overall performance of the device under different Mediterranean wave conditions. In addition, two turbine types have been tested, with different submerged depths, added inertia, damping and different incident wave conditions, allowing to take important information about the most convenient configuration. Valuable inside about the turbine limitations and efficiency has been learned, drawing the possibility of further improvements of the device. Furthermore, the axis rotational speed and torque measurements in continuous, permitted to evaluate the power generated in the rotor (PTO) for different wave height and period conditions Progress Made: For Marine Renewable Energy Industry The test results gave important inputs for the selection of the turbine to be used in the WAVESAX RSE2 device. Next step will be the improvement of the nowadays turbine configuration, implement and test PTO control, installation of power absorption, analyses of electricity production and quality. Main actions will be: a) Analyse the efficiency of turbine geometry, using CFD model. b) Improve the converter component maximising PTO, using CFD model. c) Elaborate the next Stage 3 System Validation (TRL5-TRL6). Prepare the device validation with test of the prototype in real sea conditions (Stage 4). Due to the modular conception of the WAVESAX RSE2, the device is meant to be produced at large scale in the future, with a consistent impact on marine energy industry. 3.2 KEY LESSONS LEARNED Main key lessons learned: Doing laboratory experiments are essential to observe the behaviour and to understand the actual functionality of a marine device. Page 21 of 25

22 Preliminary numerical modelling analysis of the device showed to be very useful, allowing to arrive to the ocean wave basin with defined configurations to be compared and with operational parameters to be tested. Importance of creating a clear structure for storing data, descriptions, observations and analysis, for each experiment case. Performing laboratory tests is a quite complicated issue, because of the large number of permanent checking and controls. Thanks to the LHEEA-ECN staff expertise all the performed tests have run perfectly. Photo and video documentation is really vital when re-viewing and sharing information with other colleagues, during the next phases of the device development. 4 FURTHER INFORMATION 4.1 SCIENTIFIC PUBLICATIONS List of any scientific publications made (already or planned) as a result of this work: At least two publications (including a joint one with ECN), presenting the results of the ocean wave tank, are foreseen in the second half of 2015 and Preliminary presentation of device testing at the Workshop Energia Elettrica dal Mare, organized by ENEA (Rome, 7 th July 2015). 4.2 WEBSITE & SOCIAL MEDIA Website: YouTube Link(s): LinkedIn/Twitter/Facebook Links: Online Photographs Link: 5 REFERENCES 1. Peviani M., Carli F., Bonamano S.: Wave energy potential map along the Italian coast, presented at HYDRO2011 (Prague, Czech Republic) Peviani M., Carli F., Bonamano S.: European wave energy and studies for Italy s potential, published at the International Journal on Hydropower and Dams (Vol 18 issue 5) Peviani M., Scanu S., Carli F.: Valutazione per lo studio di fattibilità di un dispositivo di generazione di energia elettrica dal moto ondoso (RSE Report ) Agate G., Amicarelli A., Peviani M.: Studi indirizzati allo sviluppo di sistemi innovativi per la generazione di energia dal moto ondoso (RSE Report ) Alterach J., Stella G., Danelli A., Peviani M.: Dati e misure per la valutazione del potenziale di generazione di energia dal moto ondoso e dal gradiente salino in Italia (RSE Report ) Agate G., Amicarelli A., Peviani M.: Analisi fluidodinamica di un prototipo per la conversione di energia da moto ondoso: ottimizzazione della componente fissa e stime preliminari di potenza assorbita con la girante (RSE Report ) Paladini F., Carli F., Bonamano S., Marcelli M., Danelli A., Peviani M.: Sistema di monitoraggio e valutazione del potenziale energetico dal moto ondoso, presso il Porto di Civitavecchia. Workshop Energia dal mare Le nuove tecnologie per i mari italiani (Rome, Italy) July Peviani M., Agate G., Amicarelli A., Danelli A. (2014) WAVE SAX, un dispositivo modulare innovativo per la generazione d'energia elettrica dal moto. Workshop Energia dal mare Le nuove tecnologie per i mari italiani (Rome, Italia) July Page 22 of 25

23 9. Paladini F., Carli F., Bonamano S., Marcelli M., Peviani M.: Evaluation of wave energy potential applying a numerical modelling downscaling methodology in Central East Tyrrhenian Sea, presented at the Renew2014 (Lisbon, Portugal) Agate G., Amicarelli A., Danelli A., Peviani M.: Optimization of the WaveSax device: numerical modelling and ocean wave basin tests, presented at the MARINE 2015 VI International Conference on Computational Methods in Marine Engineering (Rome, Italy) June APPENDICES 6.1 STAGE DEVELOPMENT SUMMARY TABLE The table following offers an overview of the test programmes recommended by IEA-OES for each Technology Readiness Level. This is only offered as a guide and is in no way extensive of the full test programme that should be committed to at each TRL. Page 23 of 25

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