Nav: Home

Energy storage system of tomorrow tested for the first time in Lake Constance

November 11, 2016

After several years' research work, the StEnSea project (Stored Energy in the Sea) funded by the Federal Ministry for Economic Affairs and Energy is now entering the test phase. In the framework of this project, IWES, the Fraunhofer institute in Kassel specialized in energy system technology, is now developing to application level the "marine egg" invented by two physics professors at Goethe University Frankfurt and Saarland University in Saarbrücken.

A model on the scale of 1:10 with a diameter of about three meters was brought to the ferry terminal in Constance on 8.11.2016 and lowered on 9.11.2016 to a depth of 100 meters about 200 meters from the shore in Überlingen. It will now be tested for four weeks: "Pumped storage power plants installed on the seabed can use the high water pressure in very deep water to store electrical energy with the aid of hollow spheres", explains Horst Schmidt-Böcking, emeritus professor at Goethe University Frankfurt. To store energy water is pumped out of the sphere using an electric pump and to generate power water flows through a turbine into the empty sphere and produces electrical energy via a generator. Together with his colleague Dr. Gerhard Luther from Saarland University, Professor Schmidt-Böcking filed a patent for their principle for offshore energy storage in 2011, just a few days before the Fukushima disaster.

The two inventors remember: "The rapid practical realization of our idea is actually thanks to a newspaper article in the FAZ. Georg Küffner, the technology editor, presented our idea for energy storage to the general public - as chance would have it on the 1st of April 2011. Lots of readers doubtlessly thought at first that it was an April Fool hoax, but experts at Hochtief Solutions AG in Frankfurt immediately recognized the idea's hidden possibilities. Within a couple of weeks we were able to set up a consortium for an initial feasibility study with Hochtief's specialists for concrete structures and the experts in marine power and energy storage at IWES in Kassel, the Fraunhofer Institute for Wind Energy and Energy System Technology", recall Schmidt-Böcking and Luther.

Once the concept's feasibility had been proven, the Federal Ministry for Economic Affairs and Energy subsequently funded the StEnSea project so that the innovative pumped storage system could be further developed and tested on a model scale. It is now entering the test phase. Project Manager Matthias Puchta from Fraunhofer IWES summarizes the project's successes to date: "On the basis of our preliminary study, we carried out a detailed systems analysis with a design, construction and logistics concept for the pressure tank, developed a turbine-pump unit, examined how to connect the sphere to the electricity grid, calculated profitability and drew up a roadmap for the system's technical implementation."

He continues: "The four-week model trials on the scale of 1:10 are starting now in Lake Constance. We will run various tests to check all the details concerning design, installation, configuration of the drivetrain and the electrical system, operation and control, condition monitoring as well as dynamic modeling and simulation of the system as a whole."

IWES Head of Division Jochen Bard, who has been involved in marine power research for many years at both national and international level, explains: "With the results from the model trials, we want first of all to look more closely at suitable sites for a demonstration project in Europe. We are aiming at a sphere diameter of 30 meters for the demonstration-scale system. At the moment that's the most practical size in terms of engineering. What's already certain is that the system can only be used economically in the sea at depths of about 600-800 meters upwards. Storage capacity with the same volume increases linearly with the depth of the water and at 700 meters is about 20 megawatt hours (MWh) for a 30 m sphere."

He continues: "There is great potential for the use of marine pumped storage systems in coastal areas, in particular near the coast in highly populated regions too, for example in Norway (Norwegian Trench). But Spain, the USA and Japan also have great potential. With a storage capacity of 20 MWh per sphere and standard technology available today, we can envisage a total electricity storage capacity of 893.000 MWh worldwide. This would make an important and inexpensive contribution to compensating fluctuations in electricity generation from wind and solar power."
-end-


Goethe University Frankfurt

Related Energy Storage Articles:

Magnetoelectric memory cell increases energy efficiency for data storage
A team of researchers has now developed a magnetoelectric random access memory (MELRAM) cell that has the potential to increase power efficiency, and thereby decrease heat waste, by orders of magnitude for read operations at room temperature.
Thin layers of water hold promise for the energy storage of the future
Researchers have found that a material which incorporates atomically thin layers of water is able to store and deliver energy much more quickly than the same material that doesn't include the water layers.
Current Graphene Science tours its journey of high-performance energy storage devices
Graphene has made its fathomable pathway over wide range of user-friendly energy storage devices.
Bio-inspired energy storage: A new light for solar power
Inspired by the western Swordfern, a groundbreaking prototype could be the answer to the storage challenge still holding solar back as a total energy solution.
Stabilizing energy storage
University of Utah and University of Michigan chemists, participating in a US Department of Energy consortium, predict a better future for these types of batteries, called redox flow batteries.
New hydronium-ion battery presents opportunity for more sustainable energy storage
A new type of battery shows promise for sustainable, high-power energy storage.It's the world's first battery to use only hydronium ions as the charge carrier.
Nanoscale view of energy storage
Through long shifts at the helm of a highly sophisticated microscope, researchers at Stanford recorded reactions at near-atomic-scale resolution.
Sandia Labs, Singapore join forces to develop energy storage
Sandia National Laboratories has signed a Cooperative Research and Development Agreement (CRADA) with the government of Singapore's Energy Market Authority (EMA) that will tap into the labs' expertise in energy storage.
New biofuel cell with energy storage
Researchers have developed a hybrid of a fuel cell and capacitor on a biocatalytic basis.
Energy storage system of tomorrow tested for the first time in Lake Constance
How can the enormous amounts of electricity generated through offshore wind power be temporarily stored on site?

Related Energy Storage Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Anthropomorphic
Do animals grieve? Do they have language or consciousness? For a long time, scientists resisted the urge to look for human qualities in animals. This hour, TED speakers explore how that is changing. Guests include biological anthropologist Barbara King, dolphin researcher Denise Herzing, primatologist Frans de Waal, and ecologist Carl Safina.
Now Playing: Science for the People

#SB2 2019 Science Birthday Minisode: Mary Golda Ross
Our second annual Science Birthday is here, and this year we celebrate the wonderful Mary Golda Ross, born 9 August 1908. She died in 2008 at age 99, but left a lasting mark on the science of rocketry and space exploration as an early woman in engineering, and one of the first Native Americans in engineering. Join Rachelle and Bethany for this very special birthday minisode celebrating Mary and her achievements. Thanks to our Patreons who make this show possible! Read more about Mary G. Ross: Interview with Mary Ross on Lash Publications International, by Laurel Sheppard Meet Mary Golda...