Mike the Mad Biologist

Underwater Kites and Electricity

deep_green
(from here)

When you think about it, it seems pretty obvious (rising to the level of “duh!”) that if one placed a wind turbine underwater it could be more efficient and, unlike wind power, ocean currents are far more predictable (of course, like most good ideas, it’s obvious after someone else thought it…). A spinoff of the Saab corporation is developing such a system:

A completely new concept of underwater wave energy using a simple 7 ton kite turbine design has been developed by Minesto; which is a spinoff from the Swedish military and aircraft design firm Saab. The Deep Green underwater turbine captures the power of the ocean just like a kite in wind….

Originally Saab was working on a kite design for a wind turbine, but found that the concept would actually work better in water, which is 832 times more dense than air.

The kite twirls in a repeating figure eight pattern (video) that increases the ocean velocity ten-fold. The first stage increases the relative flow speed entering a turbine. When the tide hits the wing it turns down, which creates a lift force. The kite is mounted to the ocean bed with a tether and is controlled by a rudder to gently nudge it in the desired trajectory.

According to Minesto’s website, each megawatt-worth of kite(s) would weigh 14 tons, so it would seem that each 7 ton kite is a 500 KW unit. According to CEO Anders Jansson’s estimate, these could probably produce power for somewhere between $0.09 cents and $0.20 cents per kwh.

Certainly because these are such extremely simple-tech structures they would be cost effective – costing less in materials per power produced, and costing less in transporting them to the site, in installing them and even in ongoing maintenance costs.

I wonder if this technology might have been developed in the U.S. had we not deployed so much of our brainpower and resources to the housing boom. Because that worked out really well.

Also, this little bit shocked me (italics mine):

The system could generate 18 terawatthours of energy annually, enough to provide nearly 4 million British households with reliably green electricity every year. UK households now use about a third of what average US households use in energy.

We might want to do something about that too. Nonetheless, kudos to Saab. You’ve come a long way baby:

SAAB94
(from here)

Comments

  1. #1 Christopher Guerra
    November 15, 2009

    What about the fish that swim into them or other larger animals? or even seaweed?

  2. #2 garmin gps systems
    November 15, 2009

    highly sophisticated technology. but what if the electric energy leakage in the sea?

  3. #3 medical necklaces
    November 15, 2009

    sure zone beneath the sea will be prohibited zones for submarine.

  4. #4 Hypocee
    November 16, 2009

    I wonder if this technology might have been developed in the U.S. had we not deployed so much of our brainpower and resources to the housing boom. Because that worked out really well.

    Because douchebag salesmen are just undermotivated scientists and inventors.

  5. #5 london speed dating
    November 18, 2009

    This is a amazing picture and looks like this is already
    working somewhere. But i don’t think this is safe for the
    underwater creatures. As it is a kite shape and size is
    very big it can affect many things. There should be blocked
    area where the underwater creature to be safe fro this big
    underwater kites.

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