Energy storage net bag

What is an energy bag?

An Energy Bag is a cable-reinforced fabric vessel that is anchored to the sea (or lake) bed at significant depths to be used for underwater compressed air energy storage. In 2011 and 2012, three prototype sub-scale Energy Bags have been tested underwater in the first such tests of their kind.

Can energy bags be used for underwater compressed air storage?

Conclusions This paper has described the design and testing of three prototype Energy Bags: cable-reinforced fabric vessels used for underwater compressed air energy storage. Firstly, two 1.8 m diameter Energy Bags were installed in a tank of fresh water and cycled 425 times.

What is compressed air energy storage?

Compressed air energy storage (CAES) is an energy storage technology whereby air is compressed to high pressures using off-peak energy and stored until such time as energy is needed from the store, at which point the air is allowed to flow out of the store and into a turbine (or any other expanding device), which drives an electric generator.

How much energy does an energy bag store?

With regard to stored energy, an Energy Bag with height of 40 m and maximum diameter of 40 m (and a volume of 35,705 m 3) would store 200 MWh if anchored at 500 m depth, assuming the most pessimistic expansion strategy was used.

Are energy bags ready for deployment?

However, as a result of the tests presented in this paper, Energy Bags are now well understood, well developed, and proven in real-world conditions, and are ready for deployment at larger scales within a pilot underwater compressed air energy storage plant.

How does air energy storage work?

In air energy storage, a compressor raises the air from ambient pressure pamb to the storing pressure psto. The pressure ratio, β, is defined as: If the air at ambient temperature, Tamb, is compressed with an isothermal process, the amount of energy require to compress a certain mass of air, m, is determined as: