The classic forms of protection against coastal erosion are represented by the "hard" structures: dikes, epi ms, etc. The evolution of technology has led to the finding of new solutions to protect the coastline through so-called transparent or “easy” structures1. In this category are part: the smash-wave structures submerged, floating, dikes made on pillars with “dolphin” profile. This paper present a system of Romanian coastal protection, between the Saturn and Neptune resorts, using transparent structures, made on the pillars “dolphin” profile, which are designed to dissipate the energy of the wave in proportion of 60%, offshore, at a distance 2km from shore. The system will consist of a 20 wind turbines, located parallel to the shoreline and deployed at a distance of 4km linear. These wind turbines will be equipped with two photovoltaic panels directed in the south direction, inclined at 30 degrees5. Between the wind turbines there will be three pillars with “dolphin” profile to mitigate the energy of the waves. On these pillars will be mounted platforms that will support five photovoltaic panels each. The degree of erosion of the beach in this area is 0.8 m/year2. The value of the advance of the erosion of the beach, at an increase of 50m in sea level, is 30.5m, and the annual rate of beach erosion at an increase of the sea level by 2.2 mm/year is 0.13 mm/year. From the analysis of the wind measurements3, its speed reaches values of 9- 12 m/s4. According to the bathymetry map6, in this area the depth of water is 10 m. The foundation of wind turbine was chosen according to the water depth. There were calculated the moments of forces acting on the wind system, to determine the sizing elements of the foundation. It’s been calculated: the kinetic pressure of the wave, the force of the wave, the moment of the wave force, the force of the wind in rotor, the moment of the wind force on the impeller, the wind force on the tower, the moment of wind force on the solar panels, the kinetic pressure of the currents in the water, the force exerted by the currents, the moment of force exerted by the currents. From the drawing of the curve of the muddy seabed, it was chosen the ression exerted by the muddy substrate on the foundation, at the depth of 10 m. The foundation of the protection pillars was designed, taking into account the kinetic pressure and strength of the wave, the force and the time of the wind force on the pillar, on the platform, by kinetic pressure of the water currents.
It is well known that our times require a high energy demand, resulting in an acute climate change due to carbon dioxide emissions, as well as that fossil fuels are limited and their amount started to be diminished. To cover worldwide energy consumption, mankind should focus on the more intensive use of renewable energy sources, which present a huge potential to ensure the energy supply in the long run. For an affordable renewable energy, it is expected to be seen a significant development of the specific technologies, nanotechnologies being strong contributors to a green energy supply. This paper is discussing about the establishment of a marine renewables network (MRNBSR), having 6 offices in maritime universities from countries that border the Black Sea: Romania, Bulgaria, Ukraine, Russia, Georgia and Turkey. This establishment aims to intensify the role that marine renewables can play in the energy system of coastline countries and also the facilitation of the integration of nanotechnologies into maritime renewables sector in the region, based on the reality that universities are centers of research and innovation. The new formed network will work as a coordinator of the will to increase the deployment of renewable energy use. Will be given the steps to be followed in the setting up of the network. After the establishment, in these offices will work personnel with specific tasks - which will be described in the paper.
In this paper are presented the process of measuring parameters of marine waves with performed devices which permit to obtain the values of the speed and current division marine wave amplitude and direction of the wave at each measurement, the number of measurements, date, hour, minute and second of measurement. This monitoring, which comprises the period of one year including, reveals an amplitude an annual average of the wave of hmed=1.53 m, obtained by taking maximum envelope appeared in a measurement range of 120 seconds. The value is unexpectedly high, taking into account of the fact that on the coastline it was found of: hmed =0.467 m at Constanta Station and hmed =0.23 m at Mangalia Station. These results reveal that there is a energy potential that exceeds expectations, much larger in the area of off shore, that is to say, in more than 12 Mm off shore, in front of the coastal zone. These measurements were applied with two devices-one device for measuring hidrostatic amplitude test and other device, ADV(Advanced Doppler velocymmeter).
In this paper is studying multi-phase fluid flow simulation in a blending tank, which involve air and water. It aims to use a model of the turbulence of the fluid, addicted to set different options for each fluid turbulence. It used for simulation the equations and tools from program ANSYS 13.0. The system is composed of a tank, a pipe of air injection, four baffles, a rotor, and a vertical shaft passing through the vessel. Data entry: the rotation frequency of the rotor on axis Ox (89 rotations/min(rpm)), the speed of the air which is injected into the container (5 m/s ), diameter pipe at entry (0.0248 m).The study assumptions are: a) the temperature of the water and the air remain constant (25 °C) and that the air is incompressible, with a density equal to that at 25 0 C and 1 Pa; b) the bubbles have 3 mm diameter. The mixture requires two domains: a domain for rotor and stationary tank area. Both areas contain water as a continuous phase and air as the dispersion phase. The fields will shape buoyancy, turbulence and the forces of the fluid. In the paper are presented the details of flow analysis for: dispersed fluid in the impeller region of mixing device and of continuous fluid in the same region, with corresponding parameters, after this for tank and the boundary conditions for each studied assumptions. Flow simulation in blending tank help to optimize the shape of tank and reducing the hydraulic losses due to fouling the solid borders.