The SEWAT project aims to produce sustainable energy, in large quantities and at high power, with relatively small static and modular plants, exploiting the energy possessed by the waves of the sea, even if of small size. Our system is modular, scalable and replicable ; it is conceptually extremely banal and uses technologies very simple in use in other fields, but is able to produce a lot of energy without waste, waste water , CO2, risks and implications harmful to the environment and the community. The possibility of pollution is non-existent. It is occupied a marginal waterfront that cannot be used for other purposes, it does not take away space for other activities and does not create substantial impediments to navigation. The plants can be located outside the breakwaters or, themselves, can perform the function of breakwaters to create ports or to protect the coast. The secondary objective, in fact, linked to the particular geometry of the system, is to protect the coast from erosion and to guarantee an effective restoration of the beaches. It uses common technology and commonly used materials that do not present supply problems. Electricity, characterized by great variability, can be fed into the grid only after stabilization. The portion of energy produced in excess of consumption can be used to produce green hydrogen which would constitute the energy accumulator pending its use in periods of reduced productivity. An estimate of the power involved is difficult, because the exploitation of this energy source has not a historical past and because the proposed installation is completely new. In the technical literature there are not developed theories or reliable data. A module about 50 meters long and 6 meters wide should produce an useful power (electricity) of about 180 kW with a sea force 3. The power becomes equal to 2500 kW during periods of sea force 6.
The way of exploiting wave energy with the SEWAT device is very simple but very effective and is inspired by the observation of the natural scenery offered by the breaking waves
When the wave breaks on the rocks, the water rises on the cliff and then falls uncontrollably.
So in nature there is the dissipation of wave energy which often involves the erosion of the coast.
With the proposed SEWAT device we want to control the fall of the water of the breaking waves with the aim of obtaining energy.
The proposed device is a collector that collects the energy that waves have received from the wind over an absorbent surface area of hundreds of square miles. Consequently, the energy density (understood as the energy obtainable per unit of occupied surface) is very high and allows to obtain high powers.
It should be noted that energy is not subtracted from other natural systems, because the captured energy would still be naturally dissipated.
The SEWAT project is currently in an experimental phase. Qualitative tests were carried out using a model in order to validate the concept (Technology Readiness Level – TRL3 experimental proof of concept). At present we are building an experimental prototype to be tested at sea in real conditions (TRL 7 system prototype demonstration in operational environment). It will be located in the sea next to a breakwater barrier in the Municipality of Torchiarolo (Brindisi).
The purpose of experimenting with the prototype is to test the productivity of the system and gain further knowledge for the development of the project
The very simple but ingenious idea concerns the production of large quantities of renewable energy, using the energy of small waves in a sustainable way. No risk, no dangerous implications and no CO2 production. The goal is to exploit energy from a source that has so far been considered marginal. The system consists of modular concrete tanks, placed in the sea, partly submerged, placed on the side of sea wall and breakwaters barrier exposed to the waves or in the distance, parallel to the coast, at a certain distance to protect the coast itself.
The function of the tank wall exposed to the action of the waves is to capture the waves. It is equipped to allow waves to enter and to prevent them from exiting.
The capturing wall of the tank is made of steel panels with horizontal openings through which water enters in the tank. Each passage is closed by mobile floodgate. By the action of the waves the floodgates open automatically, allowing the ingress of the water into the tank.
The water enters but it can not go out because of the automatic closure of the floodgates, caused by the hydrodynamic effect, so it accumulates in the tank reaching a level which depends on the height of the waves. The floodgates act as «check valves».
Then, the water in the tank collects, up to a height greater than that of the «calm sea» which is on the sheltered side of the tank. The water collected in the tank therefore has potential energy, which can be exploited by racking the water into the calm sea through micro hydraulic turbines operating thanks to the flow of water.
Each micro turbine drives an electric generator to produce electricity. The number of micro turbines operating at the same time depends on the state of the sea because, to optimize the system and have a stable operation, it is necessary to have transferred almost all the water previously accumulated in the tank when the next wave arrives.
Electricity, characterized by great variability, can be fed into the grid only after stabilization. The portion of energy produced in excess of consumption can be used to produce green hydrogen which would constitute the energy accumulator pending its use in periods of reduced productivity.
The modularity of the system allows the construction of extended systems formed by a succession of juxtaposed modules.
Each module, just built, goes immediately into production, helping to finance the subsequent modules. For this reason, the initial investment is relatively limited.
the production of energy takes place in a truly sustainable way with a positive impact on the environment because it does not imply any negative influence on the environment at a global level, while at a local level it involves an improvement of the ecosystem.
The strengths can be listed as follows:
currents and the landscape are not altered, so its construction does not have a visual impact;
DANGEROUSNESS OF THE PROCESSES:
a simple technology is used that does not involve the use of toxic or harmful substances, already tested and in use in other areas of technology, totally free of dangers, risks and implications for the community.
No hydrocarbons or other substances are used that can, even incidentally, produce environmental pollution.
TIME FOR COMMISSIONING:
the time for commissioning is relatively limited thanks to the modular construction and non-invasive industrialized prefabrication. It is possible, in fact, to create very extensive systems as a succession of prefabricated modules, with the advantage that each module, whose construction requires relatively modest time and resources, immediately goes into production as soon as it is completed.
POINTS OF WEAKNESS:
The production of electricity is highly variable both in the short and in the long term, being linked to the conditions of the wave motion.
This negative aspect can be overcome by providing for stabilization of energy and the production of hydrogen.
If the plant is in an isolated location, it will be visible from the mainland.
This impact will be less and less noticeable the greater the distance from shore. In this case it may be an opportunity to develop a whole series of activities ranging from pleasure to tourism and fish farming, etc. .. which can take place at a distance from the coast but sheltered or based on the tank itself. It is obvious that this latter arrangement of the system involves, albeit in minimal terms, an interaction with the landscape, but, in the long term, it will certainly have less impact than non-installation and therefore the renunciation of capturing sustainable energy necessary for mankind.
the company GECO – Global Engineering Constructions – s.r.l. based in Brindisi, it owns the SEWAT project. ( patent n. BR2010A00004 extension PCT / IB2011 / 053091) https://gecobr.wixsite.com/sewat firstname.lastname@example.org
The team that takes care of the project management is composed of:
Giulio Teodoro Maellaro – engineer
Cosimo Maellaro -engineer
Felice Frascino – engineer
Antonio Frascino industrial expert