The Experts below are selected from a list of 61335 Experts worldwide ranked by ideXlab platform

F Morant - One of the best experts on this subject based on the ideXlab platform.

  • sensor buoy system for monitoring renewable Marine Energy resources
    Sensors, 2018
    Co-Authors: E Garcia, E Quiles, A Correcher, F Morant
    Abstract:

    In this paper we present a multi-sensor floating system designed to monitor Marine Energy parameters, in order to sample wind, wave, and Marine current Energy resources. For this purpose, a set of dedicated sensors to measure the height and period of the waves, wind, and Marine current intensity and direction have been selected and installed in the system. The floating device incorporates wind and Marine current turbines for renewable Energy self-consumption and to carry out complementary studies on the stability of such a system. The feasibility, safety, sensor communications, and buoy stability of the floating device have been successfully checked in real operating conditions.

George G. Dimopoulos - One of the best experts on this subject based on the ideXlab platform.

  • a general purpose process modelling framework for Marine Energy systems
    Energy Conversion and Management, 2014
    Co-Authors: George G. Dimopoulos, Chariklia A Georgopoulou, Iason C Stefanatos, Alexandros Zymaris, Nikolaos M P Kakalis
    Abstract:

    Abstract High fuel prices, environmental regulations and current shipping market conditions impose ships to operate in a more efficient and greener way. These drivers lead to the introduction of new technologies, fuels, and operations, increasing the complexity of modern ship Energy systems. As a means to manage this complexity, in this paper we present the introduction of systems engineering methodologies in Marine engineering via the development of a general-purpose process modelling framework for ships named as DNV COSSMOS. Shifting the focus from components – the standard approach in shipping- to systems, widens the space for optimal design and operation solutions. The associated computer implementation of COSSMOS is a platform that models, simulates and optimises integrated Marine Energy systems with respect to Energy efficiency, emissions, safety/reliability and costs, under both steady-state and dynamic conditions. DNV COSSMOS can be used in assessment and optimisation of design and operation problems in existing vessels, new builds as well as new technologies. The main features and our modelling approach are presented and key capabilities are illustrated via two studies on the thermo-economic design and operation optimisation of a combined cycle system for large bulk carriers, and the transient operation simulation of an electric Marine propulsion system.

  • Synthesis, Design and Operation Optimization of the Marine Energy System for a Liquefied Natural Gas Carrier
    International Journal of Thermodynamics, 2008
    Co-Authors: George G. Dimopoulos, Christos A. Frangopoulos
    Abstract:

    The synthesis, design and operation optimization of the Marine Energy system for a Liquefied Natural Gas (LNG) vessel is performed in this study. A realistic problem is formulated based on a detailed thermoeconomic model of the Energy system components and the production of boil-off gas from the LNG cargo, which is used as the main fuel of the system. The time varying operation requirements of the vessel are identified and the problem is solved in a time dependent form. A novel optimization algorithm is used based on social and evolutionary metaphors. The results indicate that the duration of the trip (route) of the vessel has a significant effect on the optimum synthesis of the system.

  • Synthesis, design and operation optimization of a Marine Energy system
    Energy, 2008
    Co-Authors: George G. Dimopoulos, Aristotelis V. Kougioufas, Christos A. Frangopoulos
    Abstract:

    Recent developments in the global fuel markets imposed the need of increased fuel economy and cost effectiveness of sea-going vessels. Optimization of the ship's total Energy system, as a whole, is now a demand of the Marine industry sector in order to address the significant increase of installation and operational costs. This study is focused on the synthesis, design and operation optimization of a Marine Energy system. A realistic example of a cruise liner Energy system has been selected. Basic technology options have been identified and a generic Energy system model has been constructed. Various configuration options, types of technologies and existence of components have been incorporated in the generic system. In addition, time varying operational requirements for this cruise liner ship have been considered, resulting in a time dependent operation optimization problem. The complete optimization problem has been solved using a novel algorithm, inspired by evolutionary and social behavior metaphors. A parametric analysis with respect to the fuel price demonstrated changes in the optimum synthesis of the system.

E Garcia - One of the best experts on this subject based on the ideXlab platform.

  • sensor buoy system for monitoring renewable Marine Energy resources
    Sensors, 2018
    Co-Authors: E Garcia, E Quiles, A Correcher, F Morant
    Abstract:

    In this paper we present a multi-sensor floating system designed to monitor Marine Energy parameters, in order to sample wind, wave, and Marine current Energy resources. For this purpose, a set of dedicated sensors to measure the height and period of the waves, wind, and Marine current intensity and direction have been selected and installed in the system. The floating device incorporates wind and Marine current turbines for renewable Energy self-consumption and to carry out complementary studies on the stability of such a system. The feasibility, safety, sensor communications, and buoy stability of the floating device have been successfully checked in real operating conditions.

Coli Pritchard - One of the best experts on this subject based on the ideXlab platform.

  • a review of the sponge iron process for the storage and transmission of remotely generated Marine Energy
    International Journal of Hydrogen Energy, 2007
    Co-Authors: Dimitri Mignard, Coli Pritchard
    Abstract:

    Abstract The UK's vast Marine Energy resource is mostly located in remote areas west and north of Scotland, and transmission of this Energy to the mainland will be required. This may be achieved by using this ‘stranded’ power to generate hydrogen electrolytically, which may in turn be stored or transported using sponge iron technology. This paper reviews the technology and research needed to bring such a process on stream. We propose utilising techniques that have been developed for the oxygen carriers used in chemical looping, and also those used in early processes for hydrogen generation in the chemical industry. We briefly outline the design requirements for an Energy efficient sponge iron plant. It is shown that the iron sponge system presents better Energy efficiencies than alternative forms of bulk storage such as liquid hydrogen, magnesium hydride slurry, some at least of the metal hydrides, or methylcyclohexane–toluene–hydrogen, provided that requirements can be met for particle durability and reactivity.

Eugen Rusu - One of the best experts on this subject based on the ideXlab platform.

  • An Overview of the Expected Shoreline Impact of the Marine Energy Farms Operating in Different Coastal Environments
    Journal of Marine Science and Engineering, 2020
    Co-Authors: Alina Raileanu, Florin Onea, Eugen Rusu
    Abstract:

    The aim of the present work is to provide an overview of the possible implications involving the influence of a generic Marine Energy farm on the nearshore processes. Several case studies covering various European coastal areas are considered for illustration purposes. These include different nearshore areas, such as the Portuguese coast, Sardinia Island or a coastal sector close to the Danube Delta in the Black Sea. For the case studies related to the Portuguese coast, it is noted that a Marine Energy farm may reduce the velocity of the longshore currents, with a complete attenuation of the current velocity for some case studies in the coastal area from Leixoes region being observed. For the area located close to the Danube Delta, it is estimated that in the proposed configuration, a Marine Energy farm would provide an efficient protection against the wave action, but it will have a relatively negligible impact on the longshore currents. Summarizing the results, we can conclude that a Marine Energy farm seems to be beneficial for coastal protection, even in the case of the enclosed areas, such as the Mediterranean or Black seas, where the erosion generated by the wave action represents a real problem.

  • The Expected Shoreline Effect of a Marine Energy Farm Operating Close to Sardinia Island
    Water, 2019
    Co-Authors: Florin Onea, Eugen Rusu
    Abstract:

    Coastal areas are defined by numerous opportunities and threats. Among them we can mention emerging renewable projects and on the other hand coastal erosion. In the present work, the impact of a generic wind–wave farm on the nearshore waves and currents in the vicinity of the Porto Ferro inlet (northwest Sardinia) was assessed. Using a reanalysis wave dataset that covers a 40-year interval (1979–2018), the most relevant wave characteristics in the target area were identified. These can reach during winter a maximum value of 7.35 m for the significant wave height. As a next step, considering a modeling system that combines a wave model (simulating waves nearshore (SWAN)) and a surf model, the coastal impact of some generic Marine Energy farms defined by a transmission coefficient of 25% was assessed. According to the results corresponding to the reference sites and lines defined close to the shore, it becomes obvious that there is a clear attenuation in terms of significant wave heights, and as regards current velocities, although the general tendency for them to decrease, there are, however, some situations when the values of the nearshore current velocities can also decrease. Finally, we can mention that the presence of a Marine Energy farm seems to be beneficial for the beach stability in this particular coastal environment, and in some cases the transformation of the breaking waves from plunging to spilling is noticed.

  • Evaluation of the shoreline effect of the Marine Energy farms in different coastal environments
    E3S Web of Conferences, 2018
    Co-Authors: Eugen Rusu, Florin Onea
    Abstract:

    The objective of the proposed work is to assess the possible effects on the shoreline dynamics of the Marine Energy farms. Three different coastal environments have been considered as case studies. The first area is located in the Portuguese continental nearshore at the European western coast of the Atlantic Ocean. The second in the Mediterranean Sea in the coastal environment of Sardinia Island and the third on the western side of the Black Sea in the Romanian nearshore. Besides the fact that, from a geographical point of view, the three areas targeted are located in very different zones, they represent also coastal environments with very different characteristics. A computational framework joining a spectral phase averaged wave model with a 1D parametric circulation model has been used. The numerical models are SWAN (acronym from Simulating Waves Nearshore) for the waves and NSSM (the Navy Standard Surf Model) for estimating the longshore currents. For each case study, the main characteristics of the environmental matrix have been analyzed first. Then, various transmission scenarios have been, designed considering also in each case different distances from the Marine Energy farm to the shoreline. A general conclusion of the proposed work is that the longshore currents are very sensitive to the presence of the Marine Energy farms and that is why such farms can also play an active role in coastal protection. Moreover, since it presents in parallel similar analyses for three coastal environments that have very different features, the present study provides a more comprehensive picture concerning the medium to long term impact on the shoreline dynamics of the future Marine Energy farms operating in the nearshore.

  • A SWOT Analysis of the Marine Energy Sector at the European Level
    2018
    Co-Authors: Cristian Stingheru, Carmen Gasparotti, Alina Raileanu, Eugen Rusu
    Abstract:

    The present work aims to present the main potential sources of Marine renewable Energy: offshore wind and ocean Energy (wave, tide, Marine currents, temperature gradients, salinity gradients) and their social and environmental impact to make an analysis of the degree of capitalization of these alternative Energy sources. The main objective of the proposed research is to identify the most relevant strengths, weaknesses, opportunities and threats (SWOT) in order to outline an overview of the use of the renewable Marine Energy resources at the European level that is to identify the possibilities of increasing the quota of exploiting the potential of the Marine Energy sector.

  • Analysis of the Effect of a Marine Energy Farm to Protect a Biosphere Reserve
    MATEC Web of Conferences, 2016
    Co-Authors: Eugen Rusu
    Abstract:

    Sacalin Peninsula in the Black Sea is a new land located south of the Saint George branch of the Danube. Since 1938 this area became a biosphere reserve since many rare species of animals and plants are to be found there. The generation of this new peninsula is due to the sedimentary process induced by the Danube River outflow and it was started more than 150 years ago. In the winter of 2013 this environment was seriously affected by some very strong storms putting in real danger this ecosystem. From this perspective, the objective of the present work is to evaluate the protection that might be offered to this area by a Marine Energy farm that would be deployed in front of the peninsula. In order to assess the coastal protection offered by the proposed solution, simulations with the SWAN (Simulating Waves Nearshore) wave model have been performed for the most relevant storm patterns. The results show that a Marine Energy farm can provide a real sheltering effect to the ecological reserve. Such approach seems to be also economically viable since this coastal environment represents a real hot spot in the Black Sea from the point of view of Marine Energy resources.