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Is the Tide Turning for Alternative Energy
Wave energy based on the action of waves. Until recently, water flow was associated with the construction of turbines to generate electricity, but times are changing. Today, tidal power and wave energy use large underwater marine turbines to generate renewable energy from the current. These giant underwater windmills convert ocean currents into electricity, providing a clean and sustainable source of energy.
Tidal current turbine power plants are installed on the seabed and generate electricity directly from the ebb and flow of currents. Like wind turbine rotor blades, a wave turbine generates lift or drag on its blades to convert the kinetic energy of the current flow into circular motion.
The speed of rotation of the blade and consequently the torque of the shaft depends on the design. The turbine produces output shaft power, which may include one or more gearboxes connected to an electric generator. A generator produces electrical power that can be controlled by changing the electrical load and is modulated to provide the required grid voltage and frequency.
Traditionally, the generation of tidal electricity has involved the construction of dams or barriers along the coast and the generation of power by low-head hydroturbines during high tides or low tides, or both. ‘liq. The use of tidal wheels, mills, and sluices has been around for hundreds of years, using the power of water currents to grind flour or pump water.
In the center of the Gulf Stream, the maximum velocity of the current is about 2 m s-1. This corresponds to an energy density of about 0.5pV2, which is about 2kJ m-3, and a power of about 0.5pV3 = 4kW m-2. This power level is sufficient for a tidal turbine to convert the tidal power into rotational motion to drive a generator and produce electricity.
There are two types of tidal energy devices that use the energy of tidal currents (AKA “tidal currents”) to generate renewable, non-polluting electricity. These devices consist of horizontal-axis and vertical-axis turbines, determined by their orientation to the seabed, and a rotating shaft that rotates a gearbox connected to the turbine by means of large, slow-moving rotor blades.
Similar to wind turbines, three- or four-bladed horizontal-axis wave turbines convert this kinetic energy into rotational energy on the output shaft by forming turbine blades as lift-generating hydrofoils on the rotor blades. The rotational speed of the rotor blades (min-1 per minute) is the ratio of the rotor circumference to the rotational period, which gives the so-called “tip speed ratio”, TSR, if the tip speed ratio is very large. As the large, rotor blades rotate, the forward blade enters the turbulent water from the front blade. Alternatively, if the tip speed ratio is too small, then too much water will flow through the turbine without doing any useful work on the blades.
Vertical axis wave power plants have many operational advantages over their horizontal cousins. The biggest one is that all gear and electrical equipment can be raised above the water line for ease of maintenance and repair. There are three main types of vertical axis wave energy installations, some of which are based on hydroelectric structures. These three are: pure drag-based Savonius, pure lift-based Kobold crossflow and Darrieus rotors, and impulse-based Banki crossflow rotors.
Another type of wave generator design that is becoming popular is the bidirectional, ducted, horizontal axis turbine with a variable speed, permanent magnet generator attached. The tidal currents are channeled through large circular channels almost like a funnel, increasing the catchment area of the seawater and accelerating it as it passes through the turbine blades. The result is a more efficient design and higher power output than a conventional wave turbine.
Wave power and even tidal power are two ocean-based technologies with high potential to provide clean, free energy in the future. Once installed, wave energy power systems are expected to be highly competitive with other conventional and renewable energy sources. They have excellent cost advantages resulting from no pollution or environmental costs. Tidal current or tidal current technologies are capable of harnessing and generating renewable energy in many marine environments around the world.
The benefits of Tidal Energy for electricity generation include:
- The electricity produced is entirely renewable because it relies on tidal currents generated by the gravitational pull of the sun and moon on the world’s oceans.
- While other forms of renewable energy depend on the weather conditions of the day (such as the amount of wind or clear skies), wave energy is completely predictable, with a high value of the electricity produced. can be done.
- Because the turbines are underground, they are protected from storm damage and cannot be seen or heard. The design has no impact on marine mammals as it has no leaking oils, no blade tips and no noticeable hole in its centre.
- Because of the density of water, a relatively small turbine can produce the same power as a much larger wind turbine.
Wave energy is one of the best renewable energy sources in the world. Wave power isn’t widely used, but as it develops, it could become a huge thing. There are high-potential flood areas around the world that are subject to very severe flooding. The world’s oceans offer great potential for power generation projects, and much of this potential is still untapped and waiting to be explored.
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