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Thermal Energy Storage (TES) Technologies

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Thermal Energy Storage (TES) Technologies ( thermal-energy-storage-tes-technologies )

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Evidence Gathering: Thermal Energy Storage (TES) Technologies particularly advanced and well established in the UK. The majority of installed and working TES installations are based on the principle of sensible heat storage. Describing sensible heat storage The concept is based on the principle of energy being stored (or extracted / exchanged) in a solid or liquid, which changes temperature, but not its phase and no chemical reaction takes place either. Typical materials used for sensible heat storage are liquids such as water, heat transfer oils and types of molten salts. Further material types include solids such as concrete, pebbles, granite, rocks, earth etc. For charging, heat from a higher temperature source is added to the store and in order to discharge, the heat is extracted to a lower temperature sink, subsequently decreasing the temperature in the store again. Sensible heat storage is widely available in the form of hot water tanks Sensible heat storage is by far the most commercially advanced type of thermal energy storage, with the primary type being tank based systems storing hot water. These are used for both small scale residential, as well as larger commercial, industrial and district heating applications. In these contexts tank based systems usually provide intra-day / daily heat storage, however, tank based systems have also been developed for interseasonal thermal energy storage. Other forms of sensible heat storage include pits, boreholes and aquifers Three other sensible heat storage technologies, which are primarily used to provide interseasonal heat storage are considered in this report. These are Pit TES (PTES), Borehole TES (BTES) and Aquifer TES (ATES). These technologies (together with large underground water tanks) are commonly summarised as underground thermal energy storage. The four different types of sensible heat storage suitable for interseasonal heat storage are illustrated in Figure 3. Figure 3 – Illustration of different TES technologies currently used for interseasonal heat storage (Source: Miedaner & Sørensen, 2015) 23

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