What are the different types of underground energy storage technologies?
For these different types of underground energy storage technologies there are several suitable geological reservoirs, namely: depleted hydrocarbon reservoirs, porous aquifers, salt formations, engineered rock caverns in host rocks and abandoned mines.
What factors should be considered when considering underground energy storage?
The hydrological characteristics of host rocks, the ground water distribution and chemistry are important criteria to be taken into account when considering underground energy storage.
How to identify porous media reservoirs for underground energy storage?
The identification of potential porous media reservoirs for underground energy storage should consider multiple factors, including geology type and caprock properties, depth, closure, permeability and porosity . 4.3.1. Depleted Hydrocarbon Reservoirs
What is underground thermal energy storage?
Underground Thermal Energy Storage (UTES) A thermal energy storage is a system that can store thermal energy by cooling, heating, melting, solidifying or vaporizing a material , such as hot-water, molten-salt or a phase-change material. Sensible heat storage (SHS) relies on the temperature variation of a solid or liquid (e.g. water).
Why is the underground a good place to store thermal energy?
The underground is suitable for thermal energy storage because it has high thermal inertia, i.e. if undisturbed below 10-15 m depth, the ground temperature is weakly affected by local above ground climate variations and maintains a stable temperature [76, 77, 78].
What should be considered when evaluating large-scale underground energy storage reservoirs?
Thermal and thermodynamics properties and behaviour of the rocks should also be considered as part of the studies developed when evaluating large-scale underground energy storage reservoirs.
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