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Introduction to thermal energy storage TES systems

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Introduction to thermal energy storage TES systems ( introduction-thermal-energy-storage-tes-systems )

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Introduction to thermal energy storage (TES) systems 3 Table 1.1 Final TES annual potential results for Germany, Spain and the EU-25 Parameter Units Germany Spain EU-25 Load reduction (L) MWth 480,844 541,266 5,854,139 Replaced thermal energy (E) GWhth 662,291 826,263 9,527,227 Replaced electrical energy (Ee) GWhe n.a. 3431 17,526 CO2 emissions reduction (RCO2) T 165,572,663 207,670,938 2579,088,559 n.a. = not available. Source: [5] built, including regasification terminals (with savings in electricity influencing the TES potential), thus making it the country with the highest potential for saving electrical energy. 1.2 Basic thermodynamics of energy storage There are three types of thermal energy storage systems: sensible heat storage, latent heat storage, and thermochemical storage. Table 1.3 shows characteristics of the three types of thermal energy storage plus the electrical storage, for comparison purposes. 1.2.1 Sensible heat storage When the energy is stored, increasing or decreasing the temperature of a storage material, sensible heat storage is occurring. The storage material can be water, air, oil, bedrock, brick, concrete, etc. Each material has its own advantages and disadvantages, but usually the material is selected according to its heat capacity and the available space for storage [1]. The amount of energy stored is calculated following Eq. [1.1]: Q=m·cp ·DT [1.1] where Q is the amount of heat stored in the material (J), m is the mas of storage material (kg), cp is the specific heat of the storage material (J/kg·K), and DT is the temperature change (K). Some common materials used in sensible heat TES systems are presented in Table 1.4. Table 1.5 presents as an example of materials used for sensible heat TES in a given application: storage in CSP plants [6]. The materials need to have high thermal capacity and be abundant and cheap. The properties looked at when selecting

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