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THERMAL ENERGY STORAGE Outlook

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THERMAL ENERGY STORAGE Outlook ( thermal-energy-storage-outlook )

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Figure 53. Absorption storage system scheme Summer (charging) Solar collector Vapour Ground-coupled hear exchanger 30 ̊ Desorber Condenser 60 ̊ CS DS Concentrated solution storage tank Diluted solution storage tank Absorbate storage tank Winter (disharging) CS DS Ground-coupled hear exchanger 10 ̊ Absorber Evaporator Heating floor >25 ̊ Vapour Notes: CS = concentrated solution; DS = diluted solution. Source: N’Tsoukpoe, Le Pierrès and Luo, 2013. 6.5 Mechanical-thermal energy storage systems TES for adiabatic compressed air energy storage Adiabatic compressed air energy storage (A-CAES) systems have been proposed to improve the overall efficiency of CAES by adding a high-temperature TES unit that stores compression heat, which would have otherwise been lost during the gas compression stage, for later use during the expansion process. A-CAES can be broken down into three parts (see Figure 54), i.e. charge, storage and discharge. For charging, one or more electrical motors drive compressors to pressurise the air (> 75 bar). For storage, compressed air storage stores air at high pressure and TES stores the compression heat during the charging process. For discharge, an expender drives the electrical generator. TES could be installed inside compressed air storage to avoid the use of a high-pressure vessel, and this type of system is called advanced adiabatic compressed air energy storage (AA-CAES). CAES operates as a battery that charges and discharges electricity. It can be scaled up easily; however, caves are normally used to reduce the cost of storage, so there are typically geographical limitations. THERMAL ENERGY STORAGE 137

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