Renewable Electric Energy Storage Systems by Storage Spheres on the Seabed of Deep Lakes or Oceans
Abstract
:1. Introduction
2. Working Scheme of a U.PSH
3. Experimental Test of the U.PSH—The StEnSea Project
4. Proposals of Other Schemes of U.PSH
4.1. Storage Carrier U.PSH for Offshore Energy Storage
4.2. U.PSH in Flooded Open Cast Coal Mining Pits
- The wall plus possible inner construction parts plus sub-construction plus upper dome should be made from concrete, thick enough to withstand the 40 bar ambient pressure.
- The buoyancy can be compensated by the weight of the concrete structure itself or by added ballast like sand or gravel.
- Since concrete is rather cheap and easy to process (climbing or sliding formwork), all bulky parts should be made of concrete where possible.
- The shape of each segment should render the optimal net storage volume.
- The turbine plus shut-off valve must be movable in one piece to the surface for maintenance.
- The installation should be low-priced, safe and fast.
- The technology is based on the well-proven concept of an arch dam, which for many decades and all over the world has been standard for reservoirs with stable rock supports.
- However, in the case of the ring dam wall, no pushing away of the structure by water pressure is possible as the ring is evenly exposed to the water pressure from all sides so that the displacement forces cancel each other out. Thus, for the ring arch dam, “stable mountain flanks” are no longer necessary.
- Because the reservoir enclosed by the ring dam wall is open at the top, no lid with supports, pillars and domes is necessary.
- The inside of the ring dam wall represents the air side of a reservoir. There are no buoyancy problems, which people know from experience with the many reservoirs all over the world.
- Exploitation of a large range of level difference between the basins. The level in the deep inner reservoir, which is optically hidden from the outside, can be varied in an extraordinarily wide range. This suggests the use of pump turbines connected in series, which can be placed at different heights on the dam wall to avoid excessive inlet pressure. In the course of a storage cycle, at least a large proportion of the pump turbines can be used in different configurations by means of variable parallel and series connections, resulting in good utilization of the pump turbines.
- Additional storage space at the bottom (Figure 14, area 37). From the business of open pit mining, big machines digging deep holes for moving the soil and extracting lignite are now available, enabling cost-effective storage space at the bottom of the ring dam wall reservoir to be produced.
5. Conclusions
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Schmidt-Böcking, H.W.; Luther, G.; Düren, M.; Puchta, M.; Bender, T.; Garg, A.; Ernst, B.; Frobeen, H. Renewable Electric Energy Storage Systems by Storage Spheres on the Seabed of Deep Lakes or Oceans. Energies 2024, 17, 73. https://doi.org/10.3390/en17010073
Schmidt-Böcking HW, Luther G, Düren M, Puchta M, Bender T, Garg A, Ernst B, Frobeen H. Renewable Electric Energy Storage Systems by Storage Spheres on the Seabed of Deep Lakes or Oceans. Energies. 2024; 17(1):73. https://doi.org/10.3390/en17010073
Chicago/Turabian StyleSchmidt-Böcking, Horst Werner, Gerhard Luther, Michael Düren, Matthias Puchta, Tom Bender, Andreas Garg, Bernhard Ernst, and Heinz Frobeen. 2024. "Renewable Electric Energy Storage Systems by Storage Spheres on the Seabed of Deep Lakes or Oceans" Energies 17, no. 1: 73. https://doi.org/10.3390/en17010073