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Tidal flow 'biomimetic' turbine produces energy by mimicking fish

A French startup's tidal flow turbine uses motion similar to that of marine species to capture more energy.

Gianluca Ricciodi Gianluca Riccio
in energia
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biomimetic tidal flow turbine

biomimetic tidal flow turbine

June 14 2022
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Here is an invention that could help us increase the efficiency of our energy production infrastructures. Eel Energy, a French startup based in Paris, is developing a very promising device to produce energy: it is a special tidal flow turbine that can operate both in the sea and in a simple river.

A 'biomimetic' tidal flow turbine, because with its movement it looks like an underwater creature, and in fact derives energy by imitating marine species. All without producing pollution of any kind, atmospheric or acoustic, in perfect harmony with the creatures that should live with it underwater.

More efficient than traditional tidal flow turbines

The tidal flow turbine of Eel Energy has a membrane that oscillates in response to water pressure. Movement is transformed into electricity thanks to a network of electrical cables and sensors.

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According to statements by a company representative, their biomimicry technology achieves greater energy efficiency than traditional tidal flow turbines. For a simple reason: a bit like it happens with photovoltaic panels whose efficiency depends on the intensity of solar radiation, the efficiency of traditional turbines depends on the water flow rate. 

Not this one.

EEL Energy's tidal flow turbine optimizes energy transfer through the interaction between the fluid and its shape, which induces the wobble of the membrane.

tidal flow turbine
tidal flow turbine

The advantages of this 'biomimicry' technology

  • Possibility of high power 10MW.
  • No cavitation problems.
  • Small footprint compared to the captured power.
  • Automatic orientation based on the current, captures 100% of the current.
  • High density of parks with tidal turbines.
  • Starting from a low fluid speed (0,7 m / s).
  • Possibility of installation near the coast (low depth).
  • It adapts to the speed of the current for optimal operation.
  • Many potential uses.
  • No Betz limit, which limits the recovery of propulsion systems.

For this it also works with a low flow

Second Franck Sylvain , founder of the start-up, the membrane is activated when the water current reaches less than 1 meter per second (1 m / s). Optimal operation is obtained starting from 2,5 m / s. To understand this, a traditional tidal flow turbine requires at least a range of 4 to 5 m / s to produce electricity. 

Given its ability to operate with a low intensity current and not to threaten the fauna and flora of aquatic environments, this biomimetic turbine can be installed practically anywhere.

It sways under the pressure of the liquid and transforms this movement into energy.

tidal flow turbine 2
tidal flow turbine 2

Tidal Flow Turbine: Really Interesting Tests

Eel Energy has been testing this biomimetic technology for at least a couple of years. Among the various tests of use (turbines combined with electricity generators) one took place in an experimental basin, Boulogne-sur-Mer.

In two separate sessions a few months apart, the turbine The tidal flow of the French startup first reached a power of 1kW, then 4kW.

For all those of "everything and now", of "eh, but it is still little". Don't be discouraged by those who are trying, and check out this video!

tags: Francegreatturbine
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