Decryption of underwater energy storage device

What is underwater compressed energy storage?

Underwater compressed energy storage is similar to CAES, with the major difference being that the air is compressed in a container located underwater. Several approaches to UWCAES are under development including the utilization of distensible air container also referred to as an Energy Bag , .

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.

How many sub-scale energy bags have been tested underwater?

In 2011 and 2012, three prototype sub-scale Energy Bags have been tested underwater in the first such tests of their kind. In the first test, two 1.8 m diameter Energy Bags were submerged in a tank of fresh water and submitted to over 400 complete inflation/deflation cycles.

What are the different types of underwater storage vessels?

Essentially, two categories of underwater storage vessels have been considered to date: rigid vessels (e.g. submerged caissons anchored to the seabed), and cable-reinforced fabric bags anchored to the seabed, known as Energy Bags.

Can a 5 m diameter energy bag be submerged in seawater?

In the second test, a 5 m diameter Energy Bag was submerged at 25 m depth in seawater at the European Marine Energy Centre (EMEC) in Orkney. Damage incurred by the Energy Bag upon initial deployment necessitated repair, emphasising the need for itemised handling and deployment protocol, and correspondingly robust bag materials.

How much energy can A CAES store at 500 m depth?

With underwater CAES at 500 m depth, an energy storage capacity of 22.7 GWh would require a storage volume of about 4.06 × 10 6 m 3 if isothermal expansion were used or about 2.20 × 10 6 m 3 if adiabatic expansion were used.