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Thermal Energy Storage (TES)

Where heat is involved, thermal energy storage can be advantageous compared to other storage types. The challenge is to store the heat as economically as possible – using the right materials and process integration is the key. Based on profound engineering know-how, Linde is offering advanced high temperature thermal energy storage systems with molten salt as storage medium.

Strengths and applications

Thermal energy storage – also called heat storage – has the main advantage that it does not involve any chemical conversion; hence it is typically simple, highly efficient and has a high cycle life. Yet, the economics and efficiency depend on the materials used and especially the integration of the storage into the overall system. A whole range of storage technologies and materials exists – with temperatures from 20°C (water) to 1000°C (metals or rocks), scales from kWh to GWh, and including phase change ("latent heat") or not ("sensible heat").

Thermal energy storage is the storage technology of choice for non-dispatchable heat production (e.g. process waste heat, solar heat), or where thermal energy such as steam is converted to power, (e.g. in a turbine). Instead of first generating the power and then storing it for later use, it is often better to first store the heat and then generate the power when it is actually needed.

More concrete, thermal energy storage can be applied

  • In concentrating solar power plants to provide dispatchable power, also during the night
  • In thermal power plants to operate them more flexibly and perform quicker load changes
  • In combined heat and power plants to provide security of heat supply and to temporally decouple the heat and power generation
  • In process industries to recover and utilize heat that is otherwise lost
  • As a component in other energy storage applications such as for example Compressed Air Energy Storage (CAES)

Linde know-how

Linde can draw on plenty of know-how on thermal energy systems.

  • Linde Engineering designs and manufactures heat exchangers of various types (coil wound, plate fin) that can be applied advantageously for high temperature thermal energy storage systems.
  • Linde is designing and offering full scale and high-temperature thermal energy storage systems based on molten salts.
  • Linde’s Technology & Innovation team and a team from Linde Engineering Schalchen plant developed a high temperature latent heat storage system together with the German Aerospace Center (DLR).

Project example

In the DSG-STORE project we collaborated with the German Aerospace Center (DLR), one of the world’s leading research institutes on thermal energy storage. We developed a latent heat storage unit based on molten salt and extruded heat exchanger tubes in order to reversibly store the enthalpy of superheated steam or other fluids. This allows to facilitate thermal energy storage in concentrating solar power plants with “direct steam generation” (DSG) in the solar receivers, but also energy recovery in industrial processes or flexibilization of combined heat and power production. The project was funded by the German Federal Ministry for Economic Affairs and Energy. For further information click here .

 










(Pictures are courtesy of The German Aerospace Center (DLR))

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