Featured Research

from universities, journals, and other organizations

Energy from tides and currents: Best arrangement of tidal sails device determined

Date:
September 17, 2013
Source:
American Institute of Physics (AIP)
Summary:
In the long sprint to find new sources of clean, low-cost power, slow and steady might win the race -- the slow-moving water of currents and tides, that is. Just as wind turbines tap into the energy of flowing air to generate electricity, hydrokinetic devices produce power from moving masses of water.

This image shows velocity and pressure around a string of submerged blades.
Credit: R.Fernandez-Feria/U.Malaga

In the long sprint to find new sources of clean, low-cost power, slow and steady might win the race -- the slow-moving water of currents and tides, that is. Just as wind turbines tap into the energy of flowing air to generate electricity, hydrokinetic devices produce power from moving masses of water.

In a paper appearing in AIP Publishing's Journal of Renewable and Sustainable Energy, Ramon Fernandez-Feria, a professor of fluid mechanics at Universidad de Mαlaga in Spain, and his colleagues Joaquin Ortega-Casanova and Daniel Cebriαn performed a computer simulation to determine the optimum configuration of one such system to enable it to extract the maximum amount of energy from any given current.

The system, developed by a Norwegian company called Tidal Sails AS, consists of a string of submerged blades or sails, connected via wire ropes, angled into the oncoming current. The rushing current generates large lift forces in the sails, and as they are pushed along through a continuous loop, they drive a generator to produce electricity.

A small-scale version of the Tidal Sails device is already in operation at a test facility constructed in a stream outside Haugesund, Norway. The pilot project has a power-producing capacity of 28 kilowatts; a full-scale version could generate several megawatts of power. Installing several such units in a tidal stream, the company says, could generate as much as 100 gigawatts of electricity per year.

In their analysis, the researchers found that the maximum amount of power could be generated using blades with a chord length (the width of the blade at a given distance along its length) equal to the separation between each individual blade, that are positioned at about a 79 degree angle relative to the oncoming current, and that move at a speed about one and half times faster than the current.

"The next step would be to refine the design of the device with further hydrodynamic numerical simulations, complemented with small-scale experiments," Fernandez-Feria said. "For instance, trying more efficient aerodynamic blade profiles, and different angles between the string of blades and the current."


Story Source:

The above story is based on materials provided by American Institute of Physics (AIP). Note: Materials may be edited for content and length.


Journal Reference:

  1. D. Cebrián, J. Ortega-Casanova, R. Fernandez-Feria. Lift and drag characteristics of a cascade of flat plates in a configuration of interest for a tidal current energy converter: Numerical simulations analysis. Journal of Renewable and Sustainable Energy, 2013; 5 (4): 043114 DOI: 10.1063/1.4816495

Cite This Page:

American Institute of Physics (AIP). "Energy from tides and currents: Best arrangement of tidal sails device determined." ScienceDaily. ScienceDaily, 17 September 2013. <www.sciencedaily.com/releases/2013/09/130917123609.htm>.
American Institute of Physics (AIP). (2013, September 17). Energy from tides and currents: Best arrangement of tidal sails device determined. ScienceDaily. Retrieved April 18, 2014 from www.sciencedaily.com/releases/2013/09/130917123609.htm
American Institute of Physics (AIP). "Energy from tides and currents: Best arrangement of tidal sails device determined." ScienceDaily. www.sciencedaily.com/releases/2013/09/130917123609.htm (accessed April 18, 2014).

Share This



More Earth & Climate News

Friday, April 18, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Great British Farmland Boom

The Great British Farmland Boom

Reuters - Business Video Online (Apr. 17, 2014) — Britain's troubled Co-operative Group is preparing to cash in on nearly 18,000 acres of farmland in one of the biggest UK land sales in decades. As Ivor Bennett reports, the market timing couldn't be better, with farmland prices soaring over 270 percent in the last 10 years. Video provided by Reuters
Powered by NewsLook.com
Small Reactors Could Be Future of Nuclear Energy

Small Reactors Could Be Future of Nuclear Energy

AP (Apr. 17, 2014) — After the Fukushima nuclear disaster, the industry fell under intense scrutiny. Now, small underground nuclear power plants are being considered as the possible future of the nuclear energy. (April 17) Video provided by AP
Powered by NewsLook.com
Change of Diet Helps Crocodile Business

Change of Diet Helps Crocodile Business

Reuters - Business Video Online (Apr. 16, 2014) — Crocodile farming has been a challenge in Zimbabwe in recent years do the economic collapse and the financial crisis. But as Ciara Sutton reports one of Europe's biggest suppliers of skins to the luxury market has come up with an unusual survival strategy - vegetarian food. Video provided by Reuters
Powered by NewsLook.com
How Mt. Everest Helped Scientists Research Diabetes

How Mt. Everest Helped Scientists Research Diabetes

Newsy (Apr. 15, 2014) — British researchers were able to use Mount Everest's low altitudes to study insulin resistance. They hope to find ways to treat diabetes. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins