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3 EP 1 930 587 A2 4 withstanding temperatures of at least approximately 1065 degrees Fahrenheit (° F) (574°C). In one embodi- ment, solar heating system 12 is a solar power tower system. [0011] After the heat transfer fluid has been heated in solar receiver 20 to the desired temperature, the heat transfer fluid flows into hot thermal storage tank 24. The heat transfer fluid is then stored in hot thermal storage tank 24 until it is needed by supercritical carbon dioxide system 14 to produce electricity. Hot thermal storage tank 24 allows for power production during cloudiness or dark- ness. [0012] When electricity generation is needed, the heat- ed heat transfer fluid is pumped from hot thermal storage tank 24 and circulated through heat exchanger 26 to pro- vide thermal energy to supercritical carbon dioxide sys- tem 14. After the heat transfer fluid has passed through heat exchanger 26, the extracted thermal energy from the heat transfer fluid results in a drastic drop in the tem- perature of the heat transfer fluid to approximately 800 ° F (427°C). The heat transfer fluid is then sent back to cold storage tank 18, where it is stored in closed cycle solar heating system 12 for reuse. [0013] The heat transfer fluid can be any fluid that has the capability to transfer heat and thermally maintain the heat in the fluid, such as water, liquid metal, or molten salt. The heat transfer fluid may also interact with a solid heat transfer media contained in cold and hot storage tanks 18 and 24. In an exemplary embodiment, molten salt is used as the heat transfer fluid through solar heating system 12. The molten salt used to transfer heat from solar receiver 20 to supercritical carbon dioxide system 14 is capable of being heated to a temperature of at least approximately 1065 ° F (574°C). The molten salt can be salts composed of a eutectic mixture of sodium nitrate and potassium nitrate. A suitable composition of the mol- ten salt is between approximately 50% and approximate- ly 70% sodium nitrate by weight and approximately 30% and approximately 50% potassium nitrate by weight. A more suitable composition of the molten salt is approxi- mately 60% sodium nitrate by weight and approximately 40% potassium nitrate by weight. [0014] Supercritical carbon dioxide turbine system 14 generally includes circulation system 34, heat exchanger 26, turbine 36, turbine generator 38, high temperature recuperator 40, low temperature recuperator 42, precool- er 44, main compressor 46, and recompression compres- sor 48. Circulation system 34 transports a Brayton cycle working fluid through supercritical carbon dioxide system 14 and generally includes high temperature line 50, first intermediate temperature line 52, high temperature re- cuperator outlet line 54, second intermediate tempera- ture line 56, low temperature recuperator outlet line 58, third intermediate temperature line 60, precooler line 62, main compressor line 64, low temperature recuperator inlet line 66, recompression compressor inlet line 68, rec- ompression compressor outlet line 70, first valve 72, sec- ond valve 74, and high temperature recuperator inlet line 76. The Brayton cycle working fluid is circulated through circulation system 34 by main compressor 46 and rec- ompression compressor 48. In addition, generator 38, turbine 36, recompression compressor 48, and main compressor 46 are connected on shaft 78. Main com- pressor 46 and recompression compressor 48 are con- nected to each other through first shaft section 78a. Rec- ompression compressor 48 and turbine 36 are connected to each other through second shaft section 78b. Turbine 36 and generator 38 are connected to each other by third shaft section 78c. In an exemplary embodiment, super- critical carbon dioxide system 14 is a supercritical carbon dioxide Brayton power conversion cycle. [0015] As the heat transfer fluid from solar heating sys- tem 12 passes through heat exchanger 26, the heat is transferred to the Brayton cycle working fluid flowing through supercritical carbon dioxide system 14. In an ex- emplary embodiment, supercritical carbon dioxide is used as the Brayton cycle working fluid flowing through supercritical carbon dioxide system 14. The supercritical carbon dioxide flowing through supercritical carbon diox- ide system 14 has the capability of being heated to a temperature of approximately 1022 °F (550°C). As the thermal energy is exchanged from the molten salt of solar heating system 12 to the supercritical carbon dioxide of supercritical carbon dioxide system 14 in heat exchanger 26, the supercritical carbon dioxide is heated to a tem- perature of approximately 1022 °F (550°C) and a pres- sure of approximately 2876 pounds per square inch (psi) (19.83 MPa) as it leaves heat exchanger 26 and flows through high temperature line 50. High temperature line 50 transports the supercritical carbon dioxide from heat exchanger 26 to turbine 36. [0016] At turbine 36, the Brayton cycle working fluid is allowed to expand and release energy, reducing the tem- perature of the Brayton cycle working fluid to approxi- mately 825 ° F (440°C) and approximately 1146 psi (7.90 MPa). The energy released during the expansion proc- ess in turbine 36 is sufficient to turn main compressor 46, recompression compressor 48, and generator 38 on shaft 78. Generator 38 uses the mechanical energy from turbine 36 to turn a generator which generates electricity. In an exemplary embodiment, generator 38 generates approximately 300 MegaWatts of electrical energy net, with an efficiency of approximately 90%. The power gen- erated by generator 38 may be used in various applica- tions, including, but not limited to: powering commercial and residential buildings. [0017] The Brayton cycle working fluid is then trans- ported from turbine 36 to high temperature recuperator 40 through first intermediate temperature line 52. In high temperature recuperator 40, the temperature of the Bray- ton cycle working fluid drops to approximately 335 °F (168°C). The Brayton cycle working fluid is then passed through second intermediate temperature line 56 to low temperature recuperator 42, where the temperature of the Brayton cycle working fluid is further reduced to ap- proximately 158 °F (70°C). 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