THERMAL POWER STORAGE - CARNOT BATTERY
OPTES®-GT-Battery
Video of the OPTES®-GT-Battery with energy storage (charging the pressure storage) and electricity supply (discharging the pressure storage)
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With the OPTES®-GT-Battery (OPtimized Thermal Electricity Storage – Gas Turbine Battery), renewable energies can be stored at economically attractive conditions. The low CAPEX is due to the simple and robust technical concept. The efficiency is over 40%. The The OPTES®-GT-Battery was presented at the “International Workshop on Carnot Batteries 2022”.
During the process, electricity is converted into heat (Power-To-Heat) and the heat is stored in a pressure storage. If necessary, the heat is converted back into electricity via a turbine (Heat-To-Power). An additional heat storage captures the waste heat after the turbine so that the resulting heat can be used for the process.
Renewable Energy: Electrical energy is converted into thermal energy via an open joule process/brayton cycle and stored in a hot pressure storage (P-VHTTES).
Hot STORASOL-P-VHTTES: In the STOARASOL Pressurized Very High Temperature Thermal Energy Storage (P-VHTTES), the heat is stored at up to 1,050°C and pressures of > 6bar, up to more than 35bar for several hours to days.
Warm STORASOL-HTTES: During the discharge process, the waste heat is stored behind the turbine in the warm HTTES storage (approx. 600°C). This heat is used during the charging process of the P-VHTTES. The electric air heater therefore only has to heat the air from approx. 600°C to up to 1,050°C. As a result, the current-to-current efficiency can be increased significantly.
Re-Electrification: By reversing the same open joule process/brayton cycle, the thermal energy from the STORASOL-P-VHTTES is converted back into electrical energy and fed into the grid.